From 87931e73f39becfc998a9a73178e4baa7f544037 Mon Sep 17 00:00:00 2001 From: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Date: Mon, 21 Sep 2026 07:23:52 -0400 Subject: [PATCH 1/3] docs(showcase): lock orthogonal-member and wall-mount zmin conventions Future pieces inherit axis-aligned boards (exit 19) and wall-sconce plaque bottoms at Z=0 (exit 16), plus finger tips cut from the member section rather than glued cubes. Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Co-authored-by: Cursor --- showcase/README.md | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/showcase/README.md b/showcase/README.md index f9dbeb84..39401186 100644 --- a/showcase/README.md +++ b/showcase/README.md @@ -101,6 +101,16 @@ entry in `showcase/gallery.json`, and a rendered still. scatter is stones, not open crates; a per-shell face floor is the budget that catches a cube leftover (exit 19). `--poke-rock` skips the clamp and over-bites; `--float-rocks` seats above the host. +- **Orthogonal members (exit 19).** Boards, planks or arms that should + sit on a world axis assert their AABB secondary extent stays within a + named bound of the member thickness. A closed-form yaw of 0.12 rad + reads as an accident, not weathering. `--yaw-boards` is the + falsifier. Fingerboard tips are a wedge whose base is the board's own + thickness×height, bitten into the board so the base face is inside + it — not a 45° cube of a different size glued on the end. +- **Wall-mount zmin (exit 16).** A wall sconce plants the plaque bottom + at Z=0. Lifting every vert by a hanging height so the asset floats in + its own space is not the same as placing it on a wall in the engine. - **Plumb and real-world size (exit 19).** Assert that the axis of a turned or lofted body is vertical, by comparing the XY centroid of a bottom slab against a top slab — not the exact `zmin` and `zmax` From 27a755bf9320d90c1f193f6685f47f03a7dda88d Mon Sep 17 00:00:00 2001 From: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Date: Mon, 21 Sep 2026 07:24:20 -0400 Subject: [PATCH 2/3] fix(showcase): wall-torch visual quality pass Rebuild the sconce from named plate and cup stations so it reads as a wall torch: running-bond ashlar, a round arm into an upward bowl, plaque zmin at 0. Hygiene 15-19 and joint-fit budgets lock the contacts. Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Co-authored-by: Cursor --- README.md | 2 +- docs/gallery/assets/wall-torch-hero.webp | Bin 10668 -> 27902 bytes docs/gallery/assets/wall-torch-preview.webp | Bin 0 -> 20888 bytes docs/gallery/index.html | 2 +- docs/gallery/wall-torch/index.html | 730 ++++++++++++++------ showcase/gallery.json | 2 +- showcase/wall-torch/README.md | 102 ++- showcase/wall-torch/preview.webp | Bin 9804 -> 27902 bytes showcase/wall-torch/wall_torch.py | 696 +++++++++++++------ 9 files changed, 1066 insertions(+), 468 deletions(-) create mode 100644 docs/gallery/assets/wall-torch-preview.webp diff --git a/README.md b/README.md index bc8fc3d7..929b35a7 100644 --- a/README.md +++ b/README.md @@ -149,7 +149,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show [`wooden-bucket`](showcase/wooden-bucket/) — procedural coopered pail with a round bail through the ear rings through the same pipeline. Falsifier `--float-handle` exits 17. -[`wall-torch`](showcase/wall-torch/) — procedural wall-mounted torch sconce with a stone plaque, iron bracket, and flame through the same pipeline. Falsifier `--skip-decimate` exits 9. +[`wall-torch`](showcase/wall-torch/) — procedural wall-mounted torch sconce with a stone plaque, iron bracket, and flame through the same pipeline. Falsifiers `--skip-decimate` (9), `--stray-vert` (15), `--float-arm` (17). [`tavern-stool`](showcase/tavern-stool/) — procedural tavern stool with turned legs, stretchers, and iron ferrules through the same pipeline. 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wall-torch

A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.

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witnesses Recomputed: 848 tris, four materials with 162 stone, 134 metal, and 44 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.384×0.360×0.670 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 92 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

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witnesses Recomputed: 1528 tris, four materials with 540 stone, 228 metal and 78 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.304×0.293×0.424 m at zmin 0, LOD ratios in band, convex collider 60 tris, non-empty glTF. Hygiene all zero. Arm-to-cup gap 0.87 mm, plate-to-plaque gap 4 mm, plaque width 0.280 m. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-arm 17; --float-plate 18; --skinny-plaque 19.

View example
diff --git a/docs/gallery/wall-torch/index.html b/docs/gallery/wall-torch/index.html index 8e07e51a..0ebae7b0 100644 --- a/docs/gallery/wall-torch/index.html +++ b/docs/gallery/wall-torch/index.html @@ -253,28 +253,44 @@

wall-torch

wall-torch render

Rendered headless by the example itself — click to zoom.

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witnesses Recomputed: 848 tris, four materials with 162 stone, 134 metal, and 44 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.384×0.360×0.670 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 92 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.
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witnesses Recomputed: 1528 tris, four materials with 540 stone, 228 metal and 78 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.304×0.293×0.424 m at zmin 0, LOD ratios in band, convex collider 60 tris, non-empty glTF. Hygiene all zero. Arm-to-cup gap 0.87 mm, plate-to-plaque gap 4 mm, plaque width 0.280 m. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-arm 17; --float-plate 18; --skinny-plaque 19.
blender --background --python showcase/wall-torch/wall_torch.py --
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A showcase piece, not an example. Procedural wall-mounted torch sconce (dressed stone plaque, iron bracket and cup, wooden haft, emissive flame) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

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A showcase piece, not an example. Procedural wall-mounted torch sconce (running-bond dressed stone plaque, iron plate and arm from named stations, bowl cup, wooden haft, emissive flame) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

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The plaque back sits on the wall plane Y=0 with zmin at 0. The iron arm is a tube from the plate station to the cup wall, not a pair of square bars aimed at a funnel. The bowl opens upward and holds the haft. Hygiene family 15–19: --stray-vert, --lift-z, --float-arm, --float-plate, --skinny-plaque.

It asserts budget conformance of the generated result. It does not witness an API contract. "It rendered without error" is not a check.

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Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, procedural-materials-and-shaders, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package).

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Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, procedural-materials-and-shaders, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package). Hygiene combinatorics match examples/mesh-hygiene-audit (copied, not imported).

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Intended size: 0.28 m plaque width, 0.40 m plaque height, bowl projecting 0.24 m from the wall; outer AABB 0.304 × 0.293 × 0.424 m.

Budgets

Declared as named constants; every gate recomputes from the mesh, materials, UVs, evaluated LOD, collider, or export file.

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| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 800–920 | 848 / 848 / 848 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2193 / 0.2193 / 0.2099 | | Materials | exactly 4 distinct, ≥24 stone, ≥24 metal, ≥8 flame | 4 slots, 162 stone, 134 metal, 44 flame | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (0.384, 0.360, 0.670) m ± 0.01 | (0.3840, 0.3600, 0.6700), zmin 0.140 | | Collider tris | ≤ 120 | 92 | | Export | written, size > 0 | 69060 / 69060 / 69048 bytes |

-

DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is 8 tris leaner on LOD2. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 12 B on 5.2.1 (glTF serializer), not a gated axis.

-

--skip-decimate skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and exit 9 fires. That is the named budget the falsifier violates.

+

| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 1400–1700 | 1528 / 1528 / 1528 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2199 / 0.2199 / 0.2199 | | Materials | exactly 4 distinct, ≥24 stone, ≥24 metal, ≥8 flame | 4 slots, 540 stone, 228 metal, 78 flame | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (0.304, 0.293, 0.424) m ± 0.015 | (0.3040, 0.2930, 0.4240), zmin 0 | | Collider tris | ≤ 180 | 60 | | Export | written, size > 0 | 124608 / 124608 / 124584 bytes |

+

Base triangles rose from 848 to 1528 in the quality pass: one mailbox slab became four courses of running-bond ashlar plus a round arm and a triangulated bowl. Outer AABB tightened from 0.384 × 0.360 × 0.670 m (and zmin 0.140) to 0.304 × 0.293 × 0.424 m at zmin 0.

+

DECIMATE COLLAPSE triangle counts are not identical across series. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 24 B on 5.2.1 (glTF serializer), not a gated axis.

+

Hygiene

+

Recomputed from the generated mesh, not asserted about the script.

+

| Axis | Declared | Measured (all three) | | --- | --- | --- | | Non-manifold edges | 0 | 0 | | Loose verts / edges | 0 / 0 | 0 / 0 | | Doubles merged at 1e-5 | 0 | 0 | | Zero-area faces | 0 | 0 | | N-gons | 0 | 0 | | Coplanar disjoint face pairs | 0 | 0 | | Grounded: zmin | within 1e-4 of 0 | 0.0000 |

+

Joint fit and plaque size

+

| Axis | Declared | Measured (all three) | | --- | --- | --- | | Arm-to-cup BVH gap | ≤ 0.008 m | 0.00087 | | Plate-to-plaque BVH gap | ≤ 0.008 m | 0.00400 | | Plaque width vs WALL_W | ± 0.04 m | 0.2800 vs 0.280 |

+

Falsifiers

+

Each violates one named budget. All were run on 4.5.11, 5.1.2 and 5.2.1 and returned the same code on each.

+

| Flag | Budget violated | Exit | | --- | --- | --- | | --skip-decimate | LOD1 ratio band | 9 | | --stray-vert | loose vertex count is 0 | 15 | | --lift-z | bounding box zmin is 0 | 16 | | --float-arm | arm-to-cup BVH gap | 17 | | --float-plate | plate-to-plaque BVH gap | 18 | | --skinny-plaque | plaque width vs WALL_W | 19 |

+

--float-arm shortens the tube to 55 % of the plate-to-cup station vector; the cup stays put. --float-plate moves only the hang plate off the plaque; the arm still reaches the cup so 17 still passes. --skinny-plaque scales the back plaque and courses to 0.55 · WALL_W.

Run

blender --background --python wall_torch.py --
 blender --background --python wall_torch.py -- --skip-decimate
+blender --background --python wall_torch.py -- --stray-vert
+blender --background --python wall_torch.py -- --lift-z
+blender --background --python wall_torch.py -- --float-arm
+blender --background --python wall_torch.py -- --float-plate
+blender --background --python wall_torch.py -- --skinny-plaque
 blender --background --python wall_torch.py -- --output torch.png
-

Smoke does not pass --output or --skip-decimate.

+

Smoke passes no flags.

Exit codes

-

File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path.

-

| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 4 distinct slots, or stone/metal/flame faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file |

+

File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path. 15–19 are the hygiene and joint-fit family.

+

| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 4 distinct slots, or stone/metal/flame faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file | | 15 | Hygiene (--stray-vert lands here) | | 16 | Grounded zmin (--lift-z) | | 17 | Arm-to-cup gap (--float-arm) | | 18 | Plate-to-plaque gap (--float-plate) | | 19 | Plaque width (--skinny-plaque) |

Source

@@ -284,17 +300,20 @@

Source

"""Game-ready wall torch sconce — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural wall-mounted torch after composing
-shipped pipeline pieces: bmesh construction, UVs, four materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural wall-mounted torch after
+composing shipped pipeline pieces: bmesh construction, UVs, four
+materials, high-to-low normal bake, LOD chain, convex collider,
+Unity glTF export.
 
-Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+The plaque back sits on the wall plane Y=0 with zmin at 0. The iron
+arm is a tube between the plate station and the cup station. The
+bowl opens upward and holds the haft. Hygiene family 15–19:
+``--stray-vert``, ``--lift-z``, ``--float-arm``, ``--float-plate``,
+``--skinny-plaque``.
 
-No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
-are not byte-identical across Blender versions — the LOD gate is a
-ratio band, not an exact count.
+No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle
+counts are not byte-identical across Blender versions — the LOD
+gate is a ratio band, not an exact count.
 
     blender --background --python wall_torch.py --
     blender --background --python wall_torch.py -- --skip-decimate
@@ -310,10 +329,8 @@ 
Source

 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -321,15 +338,34 @@ 
Source

 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-WALL_W = 0.36
-WALL_D = 0.10
-WALL_H = 0.58
-BBOX_TOL = 0.01
-# Fitted after locking geometry. Recomputed from bound_box.
-OUTER_SIZE = (0.384, 0.360, 0.670)
-
-BASE_TRIS_MIN = 800
-BASE_TRIS_MAX = 920
+WALL_W = 0.28
+WALL_D = 0.070
+WALL_H = 0.40
+CORNICE_H = 0.028
+GROUT = 0.007
+NROWS = 4
+STONE_D = 0.020
+STONE_BITE = 0.004
+PLATE_Z = 0.22
+PLATE_R = 0.055
+PLATE_T = 0.016
+CUP_Y = 0.24
+CUP_Z = 0.20
+CUP_H = 0.052
+CUP_R0 = 0.024
+CUP_R1 = 0.050
+ARM_R = 0.011
+ARM_BITE = 0.012
+HAFT_R = 0.016
+LIFT_Z = 0.05
+FLOAT_ARM = 0.55
+FLOAT_PLATE = 0.08
+SKINNY = 0.55
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (0.304, 0.293, 0.424)
+BASE_TRIS_MIN = 1400
+BASE_TRIS_MAX = 1700
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -339,7 +375,7 @@ 
Source

 MATERIAL_COUNT = 4
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 120
+COLLIDER_TRIS_MAX = 180
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.06
 STONE_FACES_MIN = 24
@@ -351,6 +387,15 @@ 
Source

 WOOD_IDX = 2
 FLAME_IDX = 3
 
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZMIN_EPS = 1e-4
+ZFIGHT_EPS = 0.002
+ZFIGHT_COS = 0.98
+ARM_GAP_MAX = 0.008
+PLATE_GAP_MAX = 0.008
+PLAQUE_W_TOL = 0.04
+
 
 def eevee_engine_id():
     return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
@@ -367,7 +412,6 @@ 
Source

 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
     depsgraph = bpy.context.evaluated_depsgraph_get()
     eval_obj = obj.evaluated_get(depsgraph)
     eval_mesh = eval_obj.to_mesh()
@@ -392,29 +436,11 @@ 
Source

     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
 def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cone(
         bm,
         cap_ends=True,
-        cap_tris=False,
+        cap_tris=segments > 4,
         segments=segments,
         radius1=radius1,
         radius2=radius2,
@@ -431,38 +457,25 @@ 
Source

     return verts
 
 
-def add_cylinder(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    return add_cone(bm, loc, radius, radius, depth, segments, mat_idx, euler=euler)
-
-
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 12
-    n_minor = 6
-    rings = []
-    for i in range(n_major):
-        u = i * (2.0 * math.pi / n_major)
-        ring = []
-        for j in range(n_minor):
-            v = j * (2.0 * math.pi / n_minor)
-            x = (major + minor * math.cos(v)) * math.cos(u)
-            y = (major + minor * math.cos(v)) * math.sin(u)
-            z = minor * math.sin(v)
-            ring.append(bm.verts.new((x, y, z)))
-        rings.append(ring)
-    for i in range(n_major):
-        i2 = (i + 1) % n_major
-        for j in range(n_minor):
-            j2 = (j + 1) % n_minor
-            face = bm.faces.new(
-                (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
-            )
-            face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    return verts
+def add_cyl_between(bm, a, b, radius, segments, mat_idx):
+    a = Vector(a)
+    b = Vector(b)
+    delta = b - a
+    length = delta.length
+    if length < 1e-8:
+        return []
+    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
+    eul = quat.to_euler("XYZ")
+    return add_cone(
+        bm,
+        (a + b) * 0.5,
+        radius,
+        radius,
+        length,
+        segments,
+        mat_idx,
+        euler=(eul.x, eul.y, eul.z),
+    )
 
 
 def pack_uvs(bm, margin=0.08):
@@ -508,138 +521,133 @@ 
Source

             )
 
 
-def build_torch_mesh(name, bevel_offset, bevel_segments):
+def build_torch_mesh(
+    name,
+    bevel_offset,
+    bevel_segments,
+    float_arm=False,
+    float_plate=False,
+    skinny_plaque=False,
+):
     bm = bmesh.new()
-    metal_faces = set()
-    flame_faces = set()
     try:
-        # One dressed plaque — a tile grid reads as bathroom masonry.
-        add_box(
-            bm,
-            (0.0, 0.0, WALL_H / 2.0),
-            (WALL_W, WALL_D, WALL_H),
-            STONE_IDX,
-        )
+        plaque_w = WALL_W * SKINNY if skinny_plaque else WALL_W
         add_box(
             bm,
-            (0.0, WALL_D / 2.0 + 0.010, WALL_H / 2.0),
-            (WALL_W - 0.048, 0.022, WALL_H - 0.070),
+            (0.0, WALL_D / 2.0, WALL_H / 2.0),
+            (plaque_w, WALL_D, WALL_H),
             STONE_IDX,
         )
         add_box(
             bm,
-            (0.0, 0.0, WALL_H + 0.014),
-            (WALL_W + 0.024, WALL_D + 0.024, 0.030),
+            (0.0, WALL_D / 2.0 + 0.006, WALL_H + CORNICE_H / 2.0 - 0.004),
+            (plaque_w + 0.024, WALL_D + 0.018, CORNICE_H),
             STONE_IDX,
         )
 
-        plate_y = WALL_D / 2.0 + 0.024
-        plate_z = 0.30
-        before = set(bm.faces)
-        add_box(bm, (0.0, plate_y, plate_z), (0.14, 0.018, 0.20), METAL_IDX)
-        add_box(bm, (0.0, plate_y, plate_z + 0.078), (0.18, 0.014, 0.028), METAL_IDX)
-        add_box(bm, (0.0, plate_y, plate_z - 0.078), (0.18, 0.014, 0.028), METAL_IDX)
-        add_rim(
-            bm,
-            (0.0, plate_y + 0.020, plate_z + 0.016),
-            0.048,
-            0.009,
-            METAL_IDX,
-            euler=(math.radians(90.0), 0.0, 0.0),
-        )
-        arm_y0 = plate_y + 0.012
-        arm_y1 = plate_y + 0.15
-        cup_z = 0.26
-        add_oriented_box(
-            bm,
-            (0.032, arm_y0, plate_z - 0.018),
-            (0.020, arm_y1, cup_z + 0.036),
-            (0.018, 0.018),
-            METAL_IDX,
-        )
-        add_oriented_box(
-            bm,
-            (-0.032, arm_y0, plate_z - 0.018),
-            (-0.020, arm_y1, cup_z + 0.036),
-            (0.018, 0.018),
-            METAL_IDX,
-        )
+        course_h = (WALL_H - GROUT * (NROWS + 1)) / NROWS
+        face_y = WALL_D - STONE_BITE + STONE_D / 2.0
+        inner = plaque_w - 2.0 * GROUT
+        for row in range(NROWS):
+            zc = GROUT + row * (course_h + GROUT) + course_h / 2.0
+            fracs = (0.58, 0.42) if row % 2 == 0 else (0.40, 0.60)
+            x = -plaque_w / 2.0 + GROUT
+            for frac in fracs:
+                w = inner * frac - GROUT * 0.5
+                cx = x + w / 2.0
+                add_box(
+                    bm,
+                    (cx, face_y, zc),
+                    (max(w, 0.04), STONE_D, course_h - 0.001),
+                    STONE_IDX,
+                )
+                x += w + GROUT
+
+        plate_y = WALL_D - 0.004 + PLATE_T / 2.0
+        if float_plate:
+            plate_y += FLOAT_PLATE
         add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, cup_z),
-            0.062,
-            0.034,
-            0.062,
-            14,
-            METAL_IDX,
-        )
-        add_cylinder(
-            bm,
-            (0.0, arm_y1 + 0.012, cup_z - 0.042),
-            0.054,
-            0.014,
-            14,
+            (0.0, plate_y, PLATE_Z),
+            PLATE_R,
+            PLATE_R,
+            PLATE_T,
+            12,
             METAL_IDX,
+            euler=(math.pi / 2.0, 0.0, 0.0),
         )
-        metal_faces.update(set(bm.faces) - before)
+        for sx, sz in ((-0.032, 0.028), (0.032, 0.028), (-0.032, -0.028), (0.032, -0.028)):
+            add_cone(
+                bm,
+                (sx, plate_y + PLATE_T / 2.0 + 0.004, PLATE_Z + sz),
+                0.006,
+                0.006,
+                0.010,
+                8,
+                METAL_IDX,
+                euler=(math.pi / 2.0, 0.0, 0.0),
+            )
 
-        stick_z0 = cup_z - 0.018
-        stick_z1 = 0.50
-        add_cylinder(
+        plate_st = Vector((0.0, plate_y, PLATE_Z))
+        cup_st = Vector((0.0, CUP_Y - CUP_R1 + ARM_BITE, CUP_Z))
+        arm_end = cup_st
+        if float_arm:
+            arm_end = plate_st + (cup_st - plate_st) * FLOAT_ARM
+        add_cyl_between(bm, plate_st, arm_end, ARM_R, 8, METAL_IDX)
+
+        add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, (stick_z0 + stick_z1) / 2.0),
-            0.026,
-            stick_z1 - stick_z0,
+            (0.0, CUP_Y, CUP_Z),
+            CUP_R0,
+            CUP_R1,
+            CUP_H,
             12,
-            WOOD_IDX,
+            METAL_IDX,
         )
         add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, 0.46),
-            0.050,
-            0.030,
-            0.12,
+            (0.0, CUP_Y, CUP_Z - CUP_H / 2.0 - 0.006),
+            CUP_R0 + 0.004,
+            CUP_R0 + 0.004,
+            0.010,
             12,
-            WOOD_IDX,
+            METAL_IDX,
         )
 
-        before = set(bm.faces)
-        flame_y = arm_y1 + 0.012
-        add_cone(bm, (0.0, flame_y, 0.56), 0.048, 0.006, 0.22, 10, FLAME_IDX)
+        cup_rim = CUP_Z + CUP_H / 2.0
+        haft_z0 = CUP_Z - CUP_H / 2.0 + 0.006
+        haft_z1 = cup_rim + 0.026
         add_cone(
             bm,
-            (0.018, flame_y - 0.010, 0.545),
-            0.030,
-            0.004,
-            0.16,
-            9,
-            FLAME_IDX,
-            euler=(0.0, math.radians(16.0), 0.0),
+            (0.0, CUP_Y, (haft_z0 + haft_z1) / 2.0),
+            HAFT_R,
+            HAFT_R,
+            haft_z1 - haft_z0,
+            10,
+            WOOD_IDX,
         )
+
+        add_cone(bm, (0.0, CUP_Y, cup_rim + 0.038), 0.034, 0.004, 0.078, 10, FLAME_IDX)
         add_cone(
             bm,
-            (-0.016, flame_y + 0.012, 0.54),
-            0.028,
-            0.004,
-            0.15,
-            9,
+            (0.012, CUP_Y - 0.008, cup_rim + 0.028),
+            0.022,
+            0.003,
+            0.058,
+            8,
             FLAME_IDX,
-            euler=(math.radians(-12.0), math.radians(-14.0), 0.0),
+            euler=(0.0, math.radians(14.0), 0.0),
         )
         add_cone(
             bm,
-            (0.006, flame_y + 0.004, 0.58),
+            (-0.010, CUP_Y + 0.006, cup_rim + 0.024),
             0.018,
             0.003,
-            0.12,
+            0.050,
             8,
             FLAME_IDX,
-            euler=(math.radians(8.0), math.radians(6.0), 0.0),
+            euler=(math.radians(-10.0), math.radians(-12.0), 0.0),
         )
-        flame_faces.update(set(bm.faces) - before)
-
-        for v in bm.verts:
-            v.co.z += 0.14
 
         if bevel_offset > 0.0:
             stone_edges = [
@@ -647,7 +655,7 @@ 
Source

                 if any(f.material_index == STONE_IDX for f in e.link_faces)
             ]
             if stone_edges:
-                bmesh.ops.bevel(
+                ret = bmesh.ops.bevel(
                     bm,
                     geom=stone_edges,
                     offset=bevel_offset,
@@ -656,25 +664,25 @@ 
Source

                     affect="EDGES",
                     clamp_overlap=True,
                 )
+                for f in ret.get("faces") or []:
+                    f.material_index = STONE_IDX
+
+        zs = [v.co.z for v in bm.verts]
+        zmin = min(zs)
+        for v in bm.verts:
+            v.co.z -= zmin
+            if v.co.z < 0.0:
+                v.co.z = 0.0
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
         for face in bm.faces:
-            face.smooth = face.material_index != STONE_IDX
-        for edge in bm.edges:
-            edge.smooth = True
-            if edge.is_manifold and len(edge.link_faces) == 2:
-                if edge.calc_face_angle() > math.radians(35.0):
-                    edge.smooth = False
-        for f in metal_faces:
-            if f.is_valid:
-                f.material_index = METAL_IDX
-        for f in flame_faces:
-            if f.is_valid:
-                f.material_index = FLAME_IDX
+            face.smooth = face.material_index in (METAL_IDX, FLAME_IDX)
         me = bpy.data.meshes.new(name)
         bm.to_mesh(me)
         me.update()
+        for poly in me.polygons:
+            poly.use_smooth = poly.material_index in (METAL_IDX, FLAME_IDX)
     finally:
         bm.free()
     obj = bpy.data.objects.new(name, me)
@@ -682,10 +690,20 @@ 
Source

     return obj
 
 
-def principled(name, color, metallic, roughness, emission=0.0, emission_color=None):
+def principled(
+    name,
+    color,
+    metallic,
+    roughness,
+    emission=0.0,
+    emission_color=None,
+    noise_scale=0.0,
+    wear=None,
+):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
@@ -696,28 +714,36 @@ 
Source

             bsdf.inputs["Emission Strength"].default_value = emission
         elif "Emission" in bsdf.inputs:
             bsdf.inputs["Emission"].default_value = ecol
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 6.0
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
     return mat
 
 
 def assign_slots(obj, stone, metal, wood, flame):
     mats = obj.data.materials
-    slots = (stone, metal, wood, flame)
-    if len(mats) == 0:
-        for s in slots:
-            mats.append(s)
-        return
-    for i, s in enumerate(slots):
+    wanted = (stone, metal, wood, flame)
+    for i, mat in enumerate(wanted):
         if i < len(mats):
-            mats[i] = s
+            mats[i] = mat
         else:
-            mats.append(s)
+            mats.append(mat)
 
 
 def world_bbox(obj):
-    corners = [obj.matrix_world @ Vector(c) for c in obj.bound_box]
-    xs = [c.x for c in corners]
-    ys = [c.y for c in corners]
-    zs = [c.z for c in corners]
+    mat = obj.matrix_world
+    pts = [mat @ v.co for v in obj.data.vertices]
+    xs = [p.x for p in pts]
+    ys = [p.y for p in pts]
+    zs = [p.z for p in pts]
     return (min(xs), min(ys), min(zs), max(xs), max(ys), max(zs))
 
 
@@ -759,7 +785,6 @@ 
Source

 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -781,6 +806,180 @@ 
Source

     return collider
 
 
+def face_area(me, poly):
+    vs = [me.vertices[i].co for i in poly.vertices]
+    if len(vs) < 3:
+        return 0.0
+    v0 = vs[0]
+    area = 0.0
+    for i in range(1, len(vs) - 1):
+        area += (vs[i] - v0).cross(vs[i + 1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for poly in me.polygons:
+        if all(i in member for i in poly.vertices):
+            return poly.material_index
+    return None
+
+
+def shell_bvh_gap(me, ga, gb):
+    bm_a = bmesh.new()
+    bm_b = bmesh.new()
+    try:
+        bm_a.from_mesh(me)
+        bm_b.from_mesh(me)
+        keep_a, keep_b = set(ga), set(gb)
+        drop_a = [f for f in bm_a.faces if not all(v.index in keep_a for v in f.verts)]
+        drop_b = [f for f in bm_b.faces if not all(v.index in keep_b for v in f.verts)]
+        if drop_a:
+            bmesh.ops.delete(bm_a, geom=drop_a, context="FACES")
+        if drop_b:
+            bmesh.ops.delete(bm_b, geom=drop_b, context="FACES")
+        if not bm_a.faces or not bm_b.faces:
+            return 1e9
+        tree = BVHTree.FromBMesh(bm_b)
+        best = 1e9
+        for v in bm_a.verts:
+            hit = tree.find_nearest(v.co)
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        for f in bm_a.faces:
+            hit = tree.find_nearest(f.calc_center_median())
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        return best
+    finally:
+        bm_a.free()
+        bm_b.free()
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, CUP_Y, PLATE_Z))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
+def joint_audit(me):
+    groups = shells(me)
+    plaques = []
+    plates = []
+    cups = []
+    arms = []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        mat = mat_of(me, g)
+        if mat == STONE_IDX and dz > 0.20 and dx > 0.12:
+            plaques.append((g, a))
+        elif mat == METAL_IDX and dy <= 0.04 and dx >= 0.08 and dz >= 0.08:
+            plates.append((g, a))
+        elif mat == METAL_IDX and a[4] > CUP_Y - 0.05 and dx > 0.05 and dz < 0.14:
+            cups.append((g, a))
+        elif mat == METAL_IDX and dy > dx and dy > dz:
+            arms.append((g, a))
+    arm_gap = 1e9
+    for ag, _ in arms:
+        for cg, _ in cups:
+            arm_gap = min(arm_gap, shell_bvh_gap(me, ag, cg))
+    plate_gap = 1e9
+    for pg, _ in plates:
+        for qg, _ in plaques:
+            plate_gap = min(plate_gap, shell_bvh_gap(me, pg, qg))
+    plaque_w = max((a[3] - a[0] for _, a in plaques), default=0.0)
+    return {
+        "plaques": len(plaques),
+        "plates": len(plates),
+        "cups": len(cups),
+        "arms": len(arms),
+        "arm_gap": arm_gap if arms and cups else 1e9,
+        "plate_gap": plate_gap if plates and plaques else 1e9,
+        "plaque_w": plaque_w,
+    }
+
+
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
@@ -835,13 +1034,34 @@ 
Source

     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    float_arm=False,
+    float_plate=False,
+    skinny_plaque=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_torch_mesh("TorchLow", bevel_offset=0.004, bevel_segments=2)
-    high = build_torch_mesh("TorchHigh", bevel_offset=0.004, bevel_segments=4)
-    stone = principled("TorchStone", (0.36, 0.34, 0.30, 1.0), 0.0, 0.72)
-    metal = principled("TorchMetal", (0.14, 0.12, 0.10, 1.0), 0.88, 0.38)
-    wood = principled("TorchWood", (0.22, 0.11, 0.05, 1.0), 0.0, 0.64)
+    kw = dict(
+        float_arm=float_arm,
+        float_plate=float_plate,
+        skinny_plaque=skinny_plaque,
+    )
+    low = build_torch_mesh("TorchLow", bevel_offset=0.004, bevel_segments=2, **kw)
+    high = build_torch_mesh("TorchHigh", bevel_offset=0.004, bevel_segments=4, **kw)
+    stone = principled(
+        "TorchStone", (0.36, 0.34, 0.30, 1.0), 0.0, 0.72,
+        noise_scale=12.0, wear=(0.28, 0.26, 0.22, 1.0),
+    )
+    metal = principled(
+        "TorchMetal", (0.14, 0.12, 0.10, 1.0), 0.88, 0.38,
+        noise_scale=18.0, wear=(0.22, 0.16, 0.10, 1.0),
+    )
+    wood = principled(
+        "TorchWood", (0.22, 0.11, 0.05, 1.0), 0.0, 0.64,
+        noise_scale=14.0, wear=(0.12, 0.06, 0.03, 1.0),
+    )
     flame = principled(
         "TorchFlame",
         (1.0, 0.28, 0.04, 1.0),
@@ -853,6 +1073,13 @@ 
Source

     assign_slots(low, stone, metal, wood, flame)
     assign_slots(high, stone, metal, wood, flame)
 
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+
     if low.data is None or len(low.data.polygons) < 6:
         return fail("torch mesh did not build", 3), None, None, None, None, None
 
@@ -883,7 +1110,7 @@ 
Source

     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider_src = build_torch_mesh("TorchColSrc", bevel_offset=0.0, bevel_segments=1)
+    collider_src = build_torch_mesh("TorchColSrc", bevel_offset=0.0, bevel_segments=1, **kw)
     collider = convex_hull_collider(collider_src, "TorchCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
@@ -897,9 +1124,11 @@ 
Source

     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    jnt = joint_audit(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -916,6 +1145,17 @@ 
Source

         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured plaques={jnt['plaques']} plates={jnt['plates']} "
+        f"cups={jnt['cups']} arms={jnt['arms']} "
+        f"arm_gap={jnt['arm_gap']:.5f} plate_gap={jnt['plate_gap']:.5f} "
+        f"plaque_w={jnt['plaque_w']:.4f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -952,6 +1192,24 @@ 
Source

             f"UV AABB overlap {overlap:.6f} > {UV_OVERLAP_MAX}",
             7,
         ), None, None, None, None, None
+    if bb[2] > ZMIN_EPS:
+        return fail(f"grounded zmin={bb[2]:.5f}", 16), None, None, None, None, None
+    if jnt["arms"] < 1 or jnt["cups"] < 1 or jnt["arm_gap"] > ARM_GAP_MAX:
+        return fail(
+            f"arm-cup gap {jnt['arm_gap']:.5f} arms={jnt['arms']} cups={jnt['cups']}",
+            17,
+        ), None, None, None, None, None
+    if jnt["plates"] < 1 or jnt["plaques"] < 1 or jnt["plate_gap"] > PLATE_GAP_MAX:
+        return fail(
+            f"plate-plaque gap {jnt['plate_gap']:.5f} plates={jnt['plates']} "
+            f"plaques={jnt['plaques']}",
+            18,
+        ), None, None, None, None, None
+    if abs(jnt["plaque_w"] - WALL_W) > PLAQUE_W_TOL:
+        return fail(
+            f"plaque width {jnt['plaque_w']:.4f} off {WALL_W}",
+            19,
+        ), None, None, None, None, None
     if (
         abs(size_x - OUTER_SIZE[0]) > BBOX_TOL
         or abs(size_y - OUTER_SIZE[1]) > BBOX_TOL
@@ -985,6 +1243,16 @@ 
Source

         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"] or hyg["zero_area"]
+        or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
     return 0, low, high, stone, tex, collider
 
 
@@ -1005,8 +1273,7 @@ 
Source

             ob.hide_render = True
             ob.hide_viewport = True
 
-    # Sconce is built on +Y; camera sits in -Y, so yaw 180 so the flame faces us.
-    low.rotation_euler.z = math.radians(142.0)
+    low.rotation_euler.z = math.radians(128.0)
 
     floor_me = bpy.data.meshes.new("Floor")
     bm = bmesh.new()
@@ -1048,16 +1315,15 @@ 
Source

     light("Key", (-3.6, -5.0, 5.4), 640.0, 4.0, (1.0, 0.94, 0.86), (50, 0, -36))
     light("Fill", (5.0, -3.4, 2.4), 42.0, 8.0, (0.72, 0.82, 1.0), (62, 0, 50))
     light("Wedge", (2.2, 4.0, 3.8), 560.0, 5.5, (1.0, 0.70, 0.40), (-70, 0, 198))
-    # Small warm key on the flame so emission reads in EEVEE stills.
-    light("FlameKick", (0.4, 1.2, 1.1), 90.0, 0.6, (1.0, 0.55, 0.22), (40, 0, 160))
+    light("FlameKick", (0.4, 1.2, 0.8), 90.0, 0.6, (1.0, 0.55, 0.22), (40, 0, 160))
 
     cam_data = bpy.data.cameras.new("Cam")
-    cam_data.lens = 50.0
+    cam_data.lens = 55.0
     cam = bpy.data.objects.new("Cam", cam_data)
-    cam.location = (1.10, -1.70, 0.64)
+    cam.location = (-0.95, -1.15, 0.36)
     scene.collection.objects.link(cam)
     aim = bpy.data.objects.new("Aim", None)
-    aim.location = (0.0, 0.06, 0.48)
+    aim.location = (0.02, 0.06, 0.21)
     scene.collection.objects.link(aim)
     con = cam.constraints.new("TRACK_TO")
     con.target = aim
@@ -1100,14 +1366,22 @@ 
Source

     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--float-arm", action="store_true")
+    p.add_argument("--float-plate", action="store_true")
+    p.add_argument("--skinny-plaque", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, stone, tex, _col = check(args.skip_decimate)
+    code, low, _high, stone, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        float_arm=args.float_arm,
+        float_plate=args.float_plate,
+        skinny_plaque=args.skinny_plaque,
+    )
     if code:
         return code
     if args.output:
diff --git a/showcase/gallery.json b/showcase/gallery.json
index 158a1a46..6f06cb0e 100644
--- a/showcase/gallery.json
+++ b/showcase/gallery.json
@@ -261,7 +261,7 @@
       "name": "wall-torch",
       "dir": "showcase/wall-torch",
       "teaches": "A procedural wall-mounted torch sconce with a dressed stone plaque, iron bracket, wooden haft, and emissive flame through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "witnessesFix": "Recomputed: 848 tris, four materials with 162 stone, 134 metal, and 44 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.384×0.360×0.670 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 92 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.",
+      "witnessesFix": "Recomputed: 1528 tris, four materials with 540 stone, 228 metal and 78 flame faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.304×0.293×0.424 m at zmin 0, LOD ratios in band, convex collider 60 tris, non-empty glTF. Hygiene all zero. Arm-to-cup gap 0.87 mm, plate-to-plaque gap 4 mm, plaque width 0.280 m. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-arm 17; --float-plate 18; --skinny-plaque 19.",
       "hero": "docs/gallery/assets/wall-torch-hero.webp",
       "preview": "showcase/wall-torch/preview.webp",
       "tags": [
diff --git a/showcase/wall-torch/README.md b/showcase/wall-torch/README.md
index 44a11a12..1c2193a7 100644
--- a/showcase/wall-torch/README.md
+++ b/showcase/wall-torch/README.md
@@ -1,9 +1,16 @@
 # Wall torch
 
 A showcase piece, not an example. Procedural wall-mounted torch sconce
-(dressed stone plaque, iron bracket and cup, wooden haft, emissive flame)
-then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal
-bake, LOD chain, convex collider, Unity glTF export.
+(running-bond dressed stone plaque, iron plate and arm from named
+stations, bowl cup, wooden haft, emissive flame) then the shipped
+pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain,
+convex collider, Unity glTF export.
+
+The plaque back sits on the wall plane Y=0 with zmin at 0. The iron
+arm is a tube from the plate station to the cup wall, not a pair of
+square bars aimed at a funnel. The bowl opens upward and holds the
+haft. Hygiene family 15–19: `--stray-vert`, `--lift-z`, `--float-arm`,
+`--float-plate`, `--skinny-plaque`.
 
 It asserts **budget conformance** of the generated result. It does not
 witness an API contract. "It rendered without error" is not a check.
@@ -14,6 +21,11 @@ witness an API contract. "It rendered without error" is not a check.
 `bake_normal_high_to_low.py`, `setup_bake_target_image.py`,
 `lod_chain.py` / `decimate_to_budget.py`, `convex_hull_collider.py`,
 `export_preset_unity.py` (helpers copied, not imported as a package).
+Hygiene combinatorics match `examples/mesh-hygiene-audit` (copied, not
+imported).
+
+Intended size: 0.28 m plaque width, 0.40 m plaque height, bowl
+projecting 0.24 m from the wall; outer AABB 0.304 × 0.293 × 0.424 m.
 
 ## Budgets
 
@@ -22,38 +34,87 @@ materials, UVs, evaluated LOD, collider, or export file.
 
 | Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 800–920 | 848 / 848 / 848 |
+| Base triangles | 1400–1700 | 1528 / 1528 / 1528 |
 | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2193 / 0.2193 / 0.2099 |
-| Materials | exactly 4 distinct, ≥24 stone, ≥24 metal, ≥8 flame | 4 slots, 162 stone, 134 metal, 44 flame |
+| LOD2 ratio | 0.10–0.35 of base | 0.2199 / 0.2199 / 0.2199 |
+| Materials | exactly 4 distinct, ≥24 stone, ≥24 metal, ≥8 flame | 4 slots, 540 stone, 228 metal, 78 flame |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
-| Outer AABB | (0.384, 0.360, 0.670) m ± 0.01 | (0.3840, 0.3600, 0.6700), zmin 0.140 |
-| Collider tris | ≤ 120 | 92 |
-| Export | written, size > 0 | 69060 / 69060 / 69048 bytes |
+| Outer AABB | (0.304, 0.293, 0.424) m ± 0.015 | (0.3040, 0.2930, 0.4240), zmin 0 |
+| Collider tris | ≤ 180 | 60 |
+| Export | written, size > 0 | 124608 / 124608 / 124584 bytes |
+
+Base triangles rose from **848 to 1528** in the quality pass: one
+mailbox slab became four courses of running-bond ashlar plus a round
+arm and a triangulated bowl. Outer AABB tightened from 0.384 × 0.360 ×
+0.670 m (and zmin 0.140) to 0.304 × 0.293 × 0.424 m at zmin 0.
+
+DECIMATE COLLAPSE triangle counts are **not** identical across series.
+The gate is a ratio band, not an exact count. Bake pixels are
+stochastic; the gate is `has_data` plus operator `FINISHED`, not
+byte-identity. Construction uses no RNG. Export byte counts differ by
+24 B on 5.2.1 (glTF serializer), not a gated axis.
+
+### Hygiene
+
+Recomputed from the generated mesh, not asserted about the script.
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Non-manifold edges | 0 | 0 |
+| Loose verts / edges | 0 / 0 | 0 / 0 |
+| Doubles merged at 1e-5 | 0 | 0 |
+| Zero-area faces | 0 | 0 |
+| N-gons | 0 | 0 |
+| Coplanar disjoint face pairs | 0 | 0 |
+| Grounded: `zmin` | within 1e-4 of 0 | 0.0000 |
+
+### Joint fit and plaque size
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Arm-to-cup BVH gap | ≤ 0.008 m | 0.00087 |
+| Plate-to-plaque BVH gap | ≤ 0.008 m | 0.00400 |
+| Plaque width vs `WALL_W` | ± 0.04 m | 0.2800 vs 0.280 |
 
-DECIMATE COLLAPSE triangle counts are **not** identical across series —
-5.2.1 is 8 tris leaner on LOD2. The gate is a ratio band, not an exact
-count. Bake pixels are stochastic; the gate is `has_data` plus operator
-`FINISHED`, not byte-identity. Construction uses no RNG. Export byte
-counts differ by 12 B on 5.2.1 (glTF serializer), not a gated axis.
+### Falsifiers
+
+Each violates one named budget. All were run on 4.5.11, 5.1.2 and 5.2.1
+and returned the same code on each.
+
+| Flag | Budget violated | Exit |
+| --- | --- | --- |
+| `--skip-decimate` | LOD1 ratio band | 9 |
+| `--stray-vert` | loose vertex count is 0 | 15 |
+| `--lift-z` | bounding box `zmin` is 0 | 16 |
+| `--float-arm` | arm-to-cup BVH gap | 17 |
+| `--float-plate` | plate-to-plaque BVH gap | 18 |
+| `--skinny-plaque` | plaque width vs `WALL_W` | 19 |
 
-`--skip-decimate` skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and
-exit 9 fires. That is the named budget the falsifier violates.
+`--float-arm` shortens the tube to 55 % of the plate-to-cup station
+vector; the cup stays put. `--float-plate` moves only the hang plate
+off the plaque; the arm still reaches the cup so 17 still passes.
+`--skinny-plaque` scales the back plaque and courses to 0.55 · `WALL_W`.
 
 ## Run
 
 ```bash
 blender --background --python wall_torch.py --
 blender --background --python wall_torch.py -- --skip-decimate
+blender --background --python wall_torch.py -- --stray-vert
+blender --background --python wall_torch.py -- --lift-z
+blender --background --python wall_torch.py -- --float-arm
+blender --background --python wall_torch.py -- --float-plate
+blender --background --python wall_torch.py -- --skinny-plaque
 blender --background --python wall_torch.py -- --output torch.png
 ```
 
-Smoke does not pass `--output` or `--skip-decimate`.
+Smoke passes no flags.
 
 ## Exit codes
 
 File-local. `9` is a valid check code. `10` is reserved for
-`gallery_framing.check_framing` on the `--output` path.
+`gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
+hygiene and joint-fit family.
 
 | Code | Meaning |
 | --- | --- |
@@ -72,3 +133,8 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 12 | Bake did not finish or image has no data |
 | 13 | Export file missing or empty |
 | 14 | `--output` produced no file |
+| 15 | Hygiene (`--stray-vert` lands here) |
+| 16 | Grounded zmin (`--lift-z`) |
+| 17 | Arm-to-cup gap (`--float-arm`) |
+| 18 | Plate-to-plaque gap (`--float-plate`) |
+| 19 | Plaque width (`--skinny-plaque`) |
diff --git a/showcase/wall-torch/preview.webp b/showcase/wall-torch/preview.webp
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diff --git a/showcase/wall-torch/wall_torch.py b/showcase/wall-torch/wall_torch.py
index 6ba38108..da5b4cf3 100644
--- a/showcase/wall-torch/wall_torch.py
+++ b/showcase/wall-torch/wall_torch.py
@@ -1,16 +1,19 @@
 """Game-ready wall torch sconce — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural wall-mounted torch after composing
-shipped pipeline pieces: bmesh construction, UVs, four materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural wall-mounted torch after
+composing shipped pipeline pieces: bmesh construction, UVs, four
+materials, high-to-low normal bake, LOD chain, convex collider,
+Unity glTF export.
 
-Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+The plaque back sits on the wall plane Y=0 with zmin at 0. The iron
+arm is a tube between the plate station and the cup station. The
+bowl opens upward and holds the haft. Hygiene family 15–19:
+``--stray-vert``, ``--lift-z``, ``--float-arm``, ``--float-plate``,
+``--skinny-plaque``.
 
-No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
-are not byte-identical across Blender versions — the LOD gate is a
-ratio band, not an exact count.
+No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle
+counts are not byte-identical across Blender versions — the LOD
+gate is a ratio band, not an exact count.
 
     blender --background --python wall_torch.py --
     blender --background --python wall_torch.py -- --skip-decimate
@@ -26,10 +29,8 @@
 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -37,15 +38,34 @@
 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-WALL_W = 0.36
-WALL_D = 0.10
-WALL_H = 0.58
-BBOX_TOL = 0.01
-# Fitted after locking geometry. Recomputed from bound_box.
-OUTER_SIZE = (0.384, 0.360, 0.670)
-
-BASE_TRIS_MIN = 800
-BASE_TRIS_MAX = 920
+WALL_W = 0.28
+WALL_D = 0.070
+WALL_H = 0.40
+CORNICE_H = 0.028
+GROUT = 0.007
+NROWS = 4
+STONE_D = 0.020
+STONE_BITE = 0.004
+PLATE_Z = 0.22
+PLATE_R = 0.055
+PLATE_T = 0.016
+CUP_Y = 0.24
+CUP_Z = 0.20
+CUP_H = 0.052
+CUP_R0 = 0.024
+CUP_R1 = 0.050
+ARM_R = 0.011
+ARM_BITE = 0.012
+HAFT_R = 0.016
+LIFT_Z = 0.05
+FLOAT_ARM = 0.55
+FLOAT_PLATE = 0.08
+SKINNY = 0.55
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (0.304, 0.293, 0.424)
+BASE_TRIS_MIN = 1400
+BASE_TRIS_MAX = 1700
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -55,7 +75,7 @@
 MATERIAL_COUNT = 4
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 120
+COLLIDER_TRIS_MAX = 180
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.06
 STONE_FACES_MIN = 24
@@ -67,6 +87,15 @@
 WOOD_IDX = 2
 FLAME_IDX = 3
 
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZMIN_EPS = 1e-4
+ZFIGHT_EPS = 0.002
+ZFIGHT_COS = 0.98
+ARM_GAP_MAX = 0.008
+PLATE_GAP_MAX = 0.008
+PLAQUE_W_TOL = 0.04
+
 
 def eevee_engine_id():
     return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
@@ -83,7 +112,6 @@ def triangle_count(mesh):
 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
     depsgraph = bpy.context.evaluated_depsgraph_get()
     eval_obj = obj.evaluated_get(depsgraph)
     eval_mesh = eval_obj.to_mesh()
@@ -108,29 +136,11 @@ def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
 def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cone(
         bm,
         cap_ends=True,
-        cap_tris=False,
+        cap_tris=segments > 4,
         segments=segments,
         radius1=radius1,
         radius2=radius2,
@@ -147,38 +157,25 @@ def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.
     return verts
 
 
-def add_cylinder(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    return add_cone(bm, loc, radius, radius, depth, segments, mat_idx, euler=euler)
-
-
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 12
-    n_minor = 6
-    rings = []
-    for i in range(n_major):
-        u = i * (2.0 * math.pi / n_major)
-        ring = []
-        for j in range(n_minor):
-            v = j * (2.0 * math.pi / n_minor)
-            x = (major + minor * math.cos(v)) * math.cos(u)
-            y = (major + minor * math.cos(v)) * math.sin(u)
-            z = minor * math.sin(v)
-            ring.append(bm.verts.new((x, y, z)))
-        rings.append(ring)
-    for i in range(n_major):
-        i2 = (i + 1) % n_major
-        for j in range(n_minor):
-            j2 = (j + 1) % n_minor
-            face = bm.faces.new(
-                (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
-            )
-            face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    return verts
+def add_cyl_between(bm, a, b, radius, segments, mat_idx):
+    a = Vector(a)
+    b = Vector(b)
+    delta = b - a
+    length = delta.length
+    if length < 1e-8:
+        return []
+    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
+    eul = quat.to_euler("XYZ")
+    return add_cone(
+        bm,
+        (a + b) * 0.5,
+        radius,
+        radius,
+        length,
+        segments,
+        mat_idx,
+        euler=(eul.x, eul.y, eul.z),
+    )
 
 
 def pack_uvs(bm, margin=0.08):
@@ -224,138 +221,133 @@ def pack_uvs(bm, margin=0.08):
             )
 
 
-def build_torch_mesh(name, bevel_offset, bevel_segments):
+def build_torch_mesh(
+    name,
+    bevel_offset,
+    bevel_segments,
+    float_arm=False,
+    float_plate=False,
+    skinny_plaque=False,
+):
     bm = bmesh.new()
-    metal_faces = set()
-    flame_faces = set()
     try:
-        # One dressed plaque — a tile grid reads as bathroom masonry.
-        add_box(
-            bm,
-            (0.0, 0.0, WALL_H / 2.0),
-            (WALL_W, WALL_D, WALL_H),
-            STONE_IDX,
-        )
+        plaque_w = WALL_W * SKINNY if skinny_plaque else WALL_W
         add_box(
             bm,
-            (0.0, WALL_D / 2.0 + 0.010, WALL_H / 2.0),
-            (WALL_W - 0.048, 0.022, WALL_H - 0.070),
+            (0.0, WALL_D / 2.0, WALL_H / 2.0),
+            (plaque_w, WALL_D, WALL_H),
             STONE_IDX,
         )
         add_box(
             bm,
-            (0.0, 0.0, WALL_H + 0.014),
-            (WALL_W + 0.024, WALL_D + 0.024, 0.030),
+            (0.0, WALL_D / 2.0 + 0.006, WALL_H + CORNICE_H / 2.0 - 0.004),
+            (plaque_w + 0.024, WALL_D + 0.018, CORNICE_H),
             STONE_IDX,
         )
 
-        plate_y = WALL_D / 2.0 + 0.024
-        plate_z = 0.30
-        before = set(bm.faces)
-        add_box(bm, (0.0, plate_y, plate_z), (0.14, 0.018, 0.20), METAL_IDX)
-        add_box(bm, (0.0, plate_y, plate_z + 0.078), (0.18, 0.014, 0.028), METAL_IDX)
-        add_box(bm, (0.0, plate_y, plate_z - 0.078), (0.18, 0.014, 0.028), METAL_IDX)
-        add_rim(
-            bm,
-            (0.0, plate_y + 0.020, plate_z + 0.016),
-            0.048,
-            0.009,
-            METAL_IDX,
-            euler=(math.radians(90.0), 0.0, 0.0),
-        )
-        arm_y0 = plate_y + 0.012
-        arm_y1 = plate_y + 0.15
-        cup_z = 0.26
-        add_oriented_box(
-            bm,
-            (0.032, arm_y0, plate_z - 0.018),
-            (0.020, arm_y1, cup_z + 0.036),
-            (0.018, 0.018),
-            METAL_IDX,
-        )
-        add_oriented_box(
-            bm,
-            (-0.032, arm_y0, plate_z - 0.018),
-            (-0.020, arm_y1, cup_z + 0.036),
-            (0.018, 0.018),
-            METAL_IDX,
-        )
+        course_h = (WALL_H - GROUT * (NROWS + 1)) / NROWS
+        face_y = WALL_D - STONE_BITE + STONE_D / 2.0
+        inner = plaque_w - 2.0 * GROUT
+        for row in range(NROWS):
+            zc = GROUT + row * (course_h + GROUT) + course_h / 2.0
+            fracs = (0.58, 0.42) if row % 2 == 0 else (0.40, 0.60)
+            x = -plaque_w / 2.0 + GROUT
+            for frac in fracs:
+                w = inner * frac - GROUT * 0.5
+                cx = x + w / 2.0
+                add_box(
+                    bm,
+                    (cx, face_y, zc),
+                    (max(w, 0.04), STONE_D, course_h - 0.001),
+                    STONE_IDX,
+                )
+                x += w + GROUT
+
+        plate_y = WALL_D - 0.004 + PLATE_T / 2.0
+        if float_plate:
+            plate_y += FLOAT_PLATE
         add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, cup_z),
-            0.062,
-            0.034,
-            0.062,
-            14,
-            METAL_IDX,
-        )
-        add_cylinder(
-            bm,
-            (0.0, arm_y1 + 0.012, cup_z - 0.042),
-            0.054,
-            0.014,
-            14,
+            (0.0, plate_y, PLATE_Z),
+            PLATE_R,
+            PLATE_R,
+            PLATE_T,
+            12,
             METAL_IDX,
+            euler=(math.pi / 2.0, 0.0, 0.0),
         )
-        metal_faces.update(set(bm.faces) - before)
+        for sx, sz in ((-0.032, 0.028), (0.032, 0.028), (-0.032, -0.028), (0.032, -0.028)):
+            add_cone(
+                bm,
+                (sx, plate_y + PLATE_T / 2.0 + 0.004, PLATE_Z + sz),
+                0.006,
+                0.006,
+                0.010,
+                8,
+                METAL_IDX,
+                euler=(math.pi / 2.0, 0.0, 0.0),
+            )
+
+        plate_st = Vector((0.0, plate_y, PLATE_Z))
+        cup_st = Vector((0.0, CUP_Y - CUP_R1 + ARM_BITE, CUP_Z))
+        arm_end = cup_st
+        if float_arm:
+            arm_end = plate_st + (cup_st - plate_st) * FLOAT_ARM
+        add_cyl_between(bm, plate_st, arm_end, ARM_R, 8, METAL_IDX)
 
-        stick_z0 = cup_z - 0.018
-        stick_z1 = 0.50
-        add_cylinder(
+        add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, (stick_z0 + stick_z1) / 2.0),
-            0.026,
-            stick_z1 - stick_z0,
+            (0.0, CUP_Y, CUP_Z),
+            CUP_R0,
+            CUP_R1,
+            CUP_H,
             12,
-            WOOD_IDX,
+            METAL_IDX,
         )
         add_cone(
             bm,
-            (0.0, arm_y1 + 0.012, 0.46),
-            0.050,
-            0.030,
-            0.12,
+            (0.0, CUP_Y, CUP_Z - CUP_H / 2.0 - 0.006),
+            CUP_R0 + 0.004,
+            CUP_R0 + 0.004,
+            0.010,
             12,
-            WOOD_IDX,
+            METAL_IDX,
         )
 
-        before = set(bm.faces)
-        flame_y = arm_y1 + 0.012
-        add_cone(bm, (0.0, flame_y, 0.56), 0.048, 0.006, 0.22, 10, FLAME_IDX)
+        cup_rim = CUP_Z + CUP_H / 2.0
+        haft_z0 = CUP_Z - CUP_H / 2.0 + 0.006
+        haft_z1 = cup_rim + 0.026
         add_cone(
             bm,
-            (0.018, flame_y - 0.010, 0.545),
-            0.030,
-            0.004,
-            0.16,
-            9,
-            FLAME_IDX,
-            euler=(0.0, math.radians(16.0), 0.0),
+            (0.0, CUP_Y, (haft_z0 + haft_z1) / 2.0),
+            HAFT_R,
+            HAFT_R,
+            haft_z1 - haft_z0,
+            10,
+            WOOD_IDX,
         )
+
+        add_cone(bm, (0.0, CUP_Y, cup_rim + 0.038), 0.034, 0.004, 0.078, 10, FLAME_IDX)
         add_cone(
             bm,
-            (-0.016, flame_y + 0.012, 0.54),
-            0.028,
-            0.004,
-            0.15,
-            9,
+            (0.012, CUP_Y - 0.008, cup_rim + 0.028),
+            0.022,
+            0.003,
+            0.058,
+            8,
             FLAME_IDX,
-            euler=(math.radians(-12.0), math.radians(-14.0), 0.0),
+            euler=(0.0, math.radians(14.0), 0.0),
         )
         add_cone(
             bm,
-            (0.006, flame_y + 0.004, 0.58),
+            (-0.010, CUP_Y + 0.006, cup_rim + 0.024),
             0.018,
             0.003,
-            0.12,
+            0.050,
             8,
             FLAME_IDX,
-            euler=(math.radians(8.0), math.radians(6.0), 0.0),
+            euler=(math.radians(-10.0), math.radians(-12.0), 0.0),
         )
-        flame_faces.update(set(bm.faces) - before)
-
-        for v in bm.verts:
-            v.co.z += 0.14
 
         if bevel_offset > 0.0:
             stone_edges = [
@@ -363,7 +355,7 @@ def build_torch_mesh(name, bevel_offset, bevel_segments):
                 if any(f.material_index == STONE_IDX for f in e.link_faces)
             ]
             if stone_edges:
-                bmesh.ops.bevel(
+                ret = bmesh.ops.bevel(
                     bm,
                     geom=stone_edges,
                     offset=bevel_offset,
@@ -372,25 +364,25 @@ def build_torch_mesh(name, bevel_offset, bevel_segments):
                     affect="EDGES",
                     clamp_overlap=True,
                 )
+                for f in ret.get("faces") or []:
+                    f.material_index = STONE_IDX
+
+        zs = [v.co.z for v in bm.verts]
+        zmin = min(zs)
+        for v in bm.verts:
+            v.co.z -= zmin
+            if v.co.z < 0.0:
+                v.co.z = 0.0
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
         for face in bm.faces:
-            face.smooth = face.material_index != STONE_IDX
-        for edge in bm.edges:
-            edge.smooth = True
-            if edge.is_manifold and len(edge.link_faces) == 2:
-                if edge.calc_face_angle() > math.radians(35.0):
-                    edge.smooth = False
-        for f in metal_faces:
-            if f.is_valid:
-                f.material_index = METAL_IDX
-        for f in flame_faces:
-            if f.is_valid:
-                f.material_index = FLAME_IDX
+            face.smooth = face.material_index in (METAL_IDX, FLAME_IDX)
         me = bpy.data.meshes.new(name)
         bm.to_mesh(me)
         me.update()
+        for poly in me.polygons:
+            poly.use_smooth = poly.material_index in (METAL_IDX, FLAME_IDX)
     finally:
         bm.free()
     obj = bpy.data.objects.new(name, me)
@@ -398,10 +390,20 @@ def build_torch_mesh(name, bevel_offset, bevel_segments):
     return obj
 
 
-def principled(name, color, metallic, roughness, emission=0.0, emission_color=None):
+def principled(
+    name,
+    color,
+    metallic,
+    roughness,
+    emission=0.0,
+    emission_color=None,
+    noise_scale=0.0,
+    wear=None,
+):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
@@ -412,28 +414,36 @@ def principled(name, color, metallic, roughness, emission=0.0, emission_color=No
             bsdf.inputs["Emission Strength"].default_value = emission
         elif "Emission" in bsdf.inputs:
             bsdf.inputs["Emission"].default_value = ecol
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 6.0
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
     return mat
 
 
 def assign_slots(obj, stone, metal, wood, flame):
     mats = obj.data.materials
-    slots = (stone, metal, wood, flame)
-    if len(mats) == 0:
-        for s in slots:
-            mats.append(s)
-        return
-    for i, s in enumerate(slots):
+    wanted = (stone, metal, wood, flame)
+    for i, mat in enumerate(wanted):
         if i < len(mats):
-            mats[i] = s
+            mats[i] = mat
         else:
-            mats.append(s)
+            mats.append(mat)
 
 
 def world_bbox(obj):
-    corners = [obj.matrix_world @ Vector(c) for c in obj.bound_box]
-    xs = [c.x for c in corners]
-    ys = [c.y for c in corners]
-    zs = [c.z for c in corners]
+    mat = obj.matrix_world
+    pts = [mat @ v.co for v in obj.data.vertices]
+    xs = [p.x for p in pts]
+    ys = [p.y for p in pts]
+    zs = [p.z for p in pts]
     return (min(xs), min(ys), min(zs), max(xs), max(ys), max(zs))
 
 
@@ -475,7 +485,6 @@ def make_lod(obj, name, ratio, skip_decimate):
 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -497,6 +506,180 @@ def convex_hull_collider(obj, name):
     return collider
 
 
+def face_area(me, poly):
+    vs = [me.vertices[i].co for i in poly.vertices]
+    if len(vs) < 3:
+        return 0.0
+    v0 = vs[0]
+    area = 0.0
+    for i in range(1, len(vs) - 1):
+        area += (vs[i] - v0).cross(vs[i + 1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for poly in me.polygons:
+        if all(i in member for i in poly.vertices):
+            return poly.material_index
+    return None
+
+
+def shell_bvh_gap(me, ga, gb):
+    bm_a = bmesh.new()
+    bm_b = bmesh.new()
+    try:
+        bm_a.from_mesh(me)
+        bm_b.from_mesh(me)
+        keep_a, keep_b = set(ga), set(gb)
+        drop_a = [f for f in bm_a.faces if not all(v.index in keep_a for v in f.verts)]
+        drop_b = [f for f in bm_b.faces if not all(v.index in keep_b for v in f.verts)]
+        if drop_a:
+            bmesh.ops.delete(bm_a, geom=drop_a, context="FACES")
+        if drop_b:
+            bmesh.ops.delete(bm_b, geom=drop_b, context="FACES")
+        if not bm_a.faces or not bm_b.faces:
+            return 1e9
+        tree = BVHTree.FromBMesh(bm_b)
+        best = 1e9
+        for v in bm_a.verts:
+            hit = tree.find_nearest(v.co)
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        for f in bm_a.faces:
+            hit = tree.find_nearest(f.calc_center_median())
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        return best
+    finally:
+        bm_a.free()
+        bm_b.free()
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, CUP_Y, PLATE_Z))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
+def joint_audit(me):
+    groups = shells(me)
+    plaques = []
+    plates = []
+    cups = []
+    arms = []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        mat = mat_of(me, g)
+        if mat == STONE_IDX and dz > 0.20 and dx > 0.12:
+            plaques.append((g, a))
+        elif mat == METAL_IDX and dy <= 0.04 and dx >= 0.08 and dz >= 0.08:
+            plates.append((g, a))
+        elif mat == METAL_IDX and a[4] > CUP_Y - 0.05 and dx > 0.05 and dz < 0.14:
+            cups.append((g, a))
+        elif mat == METAL_IDX and dy > dx and dy > dz:
+            arms.append((g, a))
+    arm_gap = 1e9
+    for ag, _ in arms:
+        for cg, _ in cups:
+            arm_gap = min(arm_gap, shell_bvh_gap(me, ag, cg))
+    plate_gap = 1e9
+    for pg, _ in plates:
+        for qg, _ in plaques:
+            plate_gap = min(plate_gap, shell_bvh_gap(me, pg, qg))
+    plaque_w = max((a[3] - a[0] for _, a in plaques), default=0.0)
+    return {
+        "plaques": len(plaques),
+        "plates": len(plates),
+        "cups": len(cups),
+        "arms": len(arms),
+        "arm_gap": arm_gap if arms and cups else 1e9,
+        "plate_gap": plate_gap if plates and plaques else 1e9,
+        "plaque_w": plaque_w,
+    }
+
+
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
@@ -551,13 +734,34 @@ def export_unity(path, objects):
     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    float_arm=False,
+    float_plate=False,
+    skinny_plaque=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_torch_mesh("TorchLow", bevel_offset=0.004, bevel_segments=2)
-    high = build_torch_mesh("TorchHigh", bevel_offset=0.004, bevel_segments=4)
-    stone = principled("TorchStone", (0.36, 0.34, 0.30, 1.0), 0.0, 0.72)
-    metal = principled("TorchMetal", (0.14, 0.12, 0.10, 1.0), 0.88, 0.38)
-    wood = principled("TorchWood", (0.22, 0.11, 0.05, 1.0), 0.0, 0.64)
+    kw = dict(
+        float_arm=float_arm,
+        float_plate=float_plate,
+        skinny_plaque=skinny_plaque,
+    )
+    low = build_torch_mesh("TorchLow", bevel_offset=0.004, bevel_segments=2, **kw)
+    high = build_torch_mesh("TorchHigh", bevel_offset=0.004, bevel_segments=4, **kw)
+    stone = principled(
+        "TorchStone", (0.36, 0.34, 0.30, 1.0), 0.0, 0.72,
+        noise_scale=12.0, wear=(0.28, 0.26, 0.22, 1.0),
+    )
+    metal = principled(
+        "TorchMetal", (0.14, 0.12, 0.10, 1.0), 0.88, 0.38,
+        noise_scale=18.0, wear=(0.22, 0.16, 0.10, 1.0),
+    )
+    wood = principled(
+        "TorchWood", (0.22, 0.11, 0.05, 1.0), 0.0, 0.64,
+        noise_scale=14.0, wear=(0.12, 0.06, 0.03, 1.0),
+    )
     flame = principled(
         "TorchFlame",
         (1.0, 0.28, 0.04, 1.0),
@@ -569,6 +773,13 @@ def check(skip_decimate):
     assign_slots(low, stone, metal, wood, flame)
     assign_slots(high, stone, metal, wood, flame)
 
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+
     if low.data is None or len(low.data.polygons) < 6:
         return fail("torch mesh did not build", 3), None, None, None, None, None
 
@@ -599,7 +810,7 @@ def check(skip_decimate):
     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider_src = build_torch_mesh("TorchColSrc", bevel_offset=0.0, bevel_segments=1)
+    collider_src = build_torch_mesh("TorchColSrc", bevel_offset=0.0, bevel_segments=1, **kw)
     collider = convex_hull_collider(collider_src, "TorchCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
@@ -613,9 +824,11 @@ def check(skip_decimate):
     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    jnt = joint_audit(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -632,6 +845,17 @@ def check(skip_decimate):
         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured plaques={jnt['plaques']} plates={jnt['plates']} "
+        f"cups={jnt['cups']} arms={jnt['arms']} "
+        f"arm_gap={jnt['arm_gap']:.5f} plate_gap={jnt['plate_gap']:.5f} "
+        f"plaque_w={jnt['plaque_w']:.4f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -668,6 +892,24 @@ def check(skip_decimate):
             f"UV AABB overlap {overlap:.6f} > {UV_OVERLAP_MAX}",
             7,
         ), None, None, None, None, None
+    if bb[2] > ZMIN_EPS:
+        return fail(f"grounded zmin={bb[2]:.5f}", 16), None, None, None, None, None
+    if jnt["arms"] < 1 or jnt["cups"] < 1 or jnt["arm_gap"] > ARM_GAP_MAX:
+        return fail(
+            f"arm-cup gap {jnt['arm_gap']:.5f} arms={jnt['arms']} cups={jnt['cups']}",
+            17,
+        ), None, None, None, None, None
+    if jnt["plates"] < 1 or jnt["plaques"] < 1 or jnt["plate_gap"] > PLATE_GAP_MAX:
+        return fail(
+            f"plate-plaque gap {jnt['plate_gap']:.5f} plates={jnt['plates']} "
+            f"plaques={jnt['plaques']}",
+            18,
+        ), None, None, None, None, None
+    if abs(jnt["plaque_w"] - WALL_W) > PLAQUE_W_TOL:
+        return fail(
+            f"plaque width {jnt['plaque_w']:.4f} off {WALL_W}",
+            19,
+        ), None, None, None, None, None
     if (
         abs(size_x - OUTER_SIZE[0]) > BBOX_TOL
         or abs(size_y - OUTER_SIZE[1]) > BBOX_TOL
@@ -701,6 +943,16 @@ def check(skip_decimate):
         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"] or hyg["zero_area"]
+        or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
     return 0, low, high, stone, tex, collider
 
 
@@ -721,8 +973,7 @@ def render_still(low, stone, tex, path, engine):
             ob.hide_render = True
             ob.hide_viewport = True
 
-    # Sconce is built on +Y; camera sits in -Y, so yaw 180 so the flame faces us.
-    low.rotation_euler.z = math.radians(142.0)
+    low.rotation_euler.z = math.radians(128.0)
 
     floor_me = bpy.data.meshes.new("Floor")
     bm = bmesh.new()
@@ -764,16 +1015,15 @@ def light(name, loc, energy, size, col, rot):
     light("Key", (-3.6, -5.0, 5.4), 640.0, 4.0, (1.0, 0.94, 0.86), (50, 0, -36))
     light("Fill", (5.0, -3.4, 2.4), 42.0, 8.0, (0.72, 0.82, 1.0), (62, 0, 50))
     light("Wedge", (2.2, 4.0, 3.8), 560.0, 5.5, (1.0, 0.70, 0.40), (-70, 0, 198))
-    # Small warm key on the flame so emission reads in EEVEE stills.
-    light("FlameKick", (0.4, 1.2, 1.1), 90.0, 0.6, (1.0, 0.55, 0.22), (40, 0, 160))
+    light("FlameKick", (0.4, 1.2, 0.8), 90.0, 0.6, (1.0, 0.55, 0.22), (40, 0, 160))
 
     cam_data = bpy.data.cameras.new("Cam")
-    cam_data.lens = 50.0
+    cam_data.lens = 55.0
     cam = bpy.data.objects.new("Cam", cam_data)
-    cam.location = (1.10, -1.70, 0.64)
+    cam.location = (-0.95, -1.15, 0.36)
     scene.collection.objects.link(cam)
     aim = bpy.data.objects.new("Aim", None)
-    aim.location = (0.0, 0.06, 0.48)
+    aim.location = (0.02, 0.06, 0.21)
     scene.collection.objects.link(aim)
     con = cam.constraints.new("TRACK_TO")
     con.target = aim
@@ -816,14 +1066,22 @@ def main():
     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--float-arm", action="store_true")
+    p.add_argument("--float-plate", action="store_true")
+    p.add_argument("--skinny-plaque", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, stone, tex, _col = check(args.skip_decimate)
+    code, low, _high, stone, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        float_arm=args.float_arm,
+        float_plate=args.float_plate,
+        skinny_plaque=args.skinny_plaque,
+    )
     if code:
         return code
     if args.output:

From 174f05bcbe0ef04ff1dbeac728287979b8b14f51 Mon Sep 17 00:00:00 2001
From: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Date: Mon, 21 Sep 2026 07:24:47 -0400
Subject: [PATCH 3/3] fix(showcase): signpost visual quality pass

Axis-align the boards, cut finger tips from the board section, and wrap the shoe as a closed collar so it reads as a fingerpost. Hygiene 15-19 plus orthogonal-board and named-shoe budgets lock the joints.

Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Co-authored-by: Cursor 
---
 README.md                                 |   2 +-
 docs/gallery/assets/signpost-hero.webp    | Bin 7978 -> 7580 bytes
 docs/gallery/assets/signpost-preview.webp | Bin 0 -> 7016 bytes
 docs/gallery/index.html                   |   2 +-
 docs/gallery/signpost/index.html          | 693 +++++++++++++++-------
 showcase/gallery.json                     |   2 +-
 showcase/signpost/README.md               | 102 +++-
 showcase/signpost/preview.webp            | Bin 7108 -> 7580 bytes
 showcase/signpost/signpost.py             | 658 +++++++++++++-------
 9 files changed, 1019 insertions(+), 440 deletions(-)
 create mode 100644 docs/gallery/assets/signpost-preview.webp

diff --git a/README.md b/README.md
index 929b35a7..392862c5 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`hand-pump`](showcase/hand-pump/) — procedural cast-iron village hand pump through the same pipeline. Falsifier `--skip-decimate` exits 9.
 
-[`signpost`](showcase/signpost/) — procedural timber fingerboard signpost through the same pipeline. Falsifier `--skip-decimate` exits 9.
+[`signpost`](showcase/signpost/) — procedural timber fingerboard signpost through the same pipeline. Falsifiers `--skip-decimate` (9), `--stray-vert` (15), `--yaw-boards` (19).
 
 [`chopping-block`](showcase/chopping-block/) — procedural hooped timber stump with an embedded axe through the same pipeline. Falsifier `--skip-decimate` exits 9.
 
diff --git a/docs/gallery/assets/signpost-hero.webp b/docs/gallery/assets/signpost-hero.webp
index b2727e05e300a151d76e8fe53d4989d6222486b8..c8c1ef4e0ed08f2ba1bcc86da2c5875fd4d0dbbe 100644
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literal 0
HcmV?d00001

diff --git a/docs/gallery/index.html b/docs/gallery/index.html
index ad6bc3ee..9a6a8ed0 100644
--- a/docs/gallery/index.html
+++ b/docs/gallery/index.html
@@ -1090,7 +1090,7 @@ 
hand-pump

         

           
signpost

           
A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.

-          
witnesses Recomputed: 504 tris, three materials with 66 metal and 24 board faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.368×0.201×1.566 m, LOD ratios in band (5.2 COLLAPSE more aggressive on LOD2), convex collider 56 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

+          
witnesses Recomputed: 376 tris, three materials with 108 metal, 22 board and 60 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.260×0.142×1.551 m at zmin 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD1/LOD2), convex collider 52 tris, non-empty glTF. Hygiene all zero. Board-to-post gap 5 mm, strap gap 3 mm, board AABB Y 28 mm. --skip-decimate exits 9; --stray-vert 15; --lift-z / --short-shoe 16; --gap-board 17; --float-strap 18; --yaw-boards 19.

           View example 
         

       
diff --git a/docs/gallery/signpost/index.html b/docs/gallery/signpost/index.html
index 9ee0871c..5bb08b0e 100644
--- a/docs/gallery/signpost/index.html
+++ b/docs/gallery/signpost/index.html
@@ -253,28 +253,45 @@ 
signpost

       signpost render
     
     
Rendered headless by the example itself — click to zoom.

-    
witnesses Recomputed: 504 tris, three materials with 66 metal and 24 board faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.368×0.201×1.566 m, LOD ratios in band (5.2 COLLAPSE more aggressive on LOD2), convex collider 56 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

+    
witnesses Recomputed: 376 tris, three materials with 108 metal, 22 board and 60 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.260×0.142×1.551 m at zmin 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD1/LOD2), convex collider 52 tris, non-empty glTF. Hygiene all zero. Board-to-post gap 5 mm, strap gap 3 mm, board AABB Y 28 mm. --skip-decimate exits 9; --stray-vert 15; --lift-z / --short-shoe 16; --gap-board 17; --float-strap 18; --yaw-boards 19.

     

       
blender --background --python showcase/signpost/signpost.py --

       
     

     

-
A showcase piece, not an example. Procedural timber fingerboard signpost (square post, collar and pyramidal cap, two painted planks with diamond tips, iron shoe and straps) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+
A showcase piece, not an example. Procedural timber fingerboard signpost (square post, pyramidal cap from the post half plus overhang, two axis-aligned painted boards with wedges cut from the board section, iron shoe collar and U-wrap straps) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+
Boards are yaw 0. Finger tips are wedges whose base is the board's own thickness×height, bitten into the board so the base face is inside it. The cap is added after the post bevel. The post stays on the origin. Hygiene family 15–19: --stray-vert, --lift-z / --short-shoe, --gap-board, --float-strap, --yaw-boards.

 
It asserts budget conformance of the generated result. It does not witness an API contract. "It rendered without error" is not a check.

-
Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package).

+
Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package). Hygiene combinatorics match examples/mesh-hygiene-audit (copied, not imported).

+
Intended size: 1.48 m post, boards 0.62 m and 0.54 m, 0.118 m post stock; outer AABB 1.260 × 0.142 × 1.551 m.

 
Budgets

 
Declared as named constants; every gate recomputes from the mesh, materials, UVs, evaluated LOD, collider, or export file.

-
| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 430–580 | 504 / 504 / 504 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2183 / 0.2183 / 0.1746 | | Materials | exactly 3 distinct, ≥24 metal and ≥12 board faces | 3 slots, 66 metal, 24 board | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (1.368, 0.201, 1.566) m ± 0.01 | (1.3679, 0.2014, 1.5660), zmin 0 | | Collider tris | ≤ 140 | 56 | | Export | written, size > 0 | 45164 / 45164 / 45152 bytes |

-
DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is more aggressive on LOD2. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 12 B on 5.2.1 (glTF serializer), not a gated axis.

-
--skip-decimate skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and exit 9 fires. That is the named budget the falsifier violates.

+
| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 320–480 | 376 / 376 / 376 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.4681 | | LOD2 ratio | 0.10–0.35 of base | 0.2181 / 0.2181 / 0.1649 | | Materials | exactly 3 distinct, ≥24 metal, ≥12 board, ≥12 wood | 3 slots, 108 metal, 22 board, 60 wood | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (1.260, 0.142, 1.551) m ± 0.015 | (1.2600, 0.1420, 1.5510), zmin 0 | | Collider tris | ≤ 180 | 52 | | Export | written, size > 0 | 35688 / 35688 / 35676 bytes |

+
Base triangles dropped from 504 to 376 in the quality pass: glued diamond cubes and a solid shoe block became wedges and a four-plate collar. Outer AABB tightened from 1.368 × 0.201 × 1.566 m.

+
DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is leaner on LOD1 and LOD2. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 12 B on 5.2.1 (glTF serializer), not a gated axis.

+
Hygiene

+
Recomputed from the generated mesh, not asserted about the script.

+
| Axis | Declared | Measured (all three) | | --- | --- | --- | | Non-manifold edges | 0 | 0 | | Loose verts / edges | 0 / 0 | 0 / 0 | | Doubles merged at 1e-5 | 0 | 0 | | Zero-area faces | 0 | 0 | | N-gons | 0 | 0 | | Coplanar disjoint face pairs | 0 | 0 | | Grounded: zmin | within 1e-4 of 0 | 0.0000 | | Named shoe plates | ≥1, each zmin ≤ 0.002 | 4, 0.00000 |

+
Joint fit and orthogonal boards

+
| Axis | Declared | Measured (all three) | | --- | --- | --- | | Board-to-post BVH gap | ≤ 0.008 m | 0.00500 | | Strap-to-post BVH gap | ≤ 0.008 m | 0.00300 | | Board AABB Y (axis-aligned) | ≤ 0.055 m | 0.0280 |

+
Falsifiers

+
Each violates one named budget. All were run on 4.5.11, 5.1.2 and 5.2.1 and returned the same code on each.

+
| Flag | Budget violated | Exit | | --- | --- | --- | | --skip-decimate | LOD1 ratio band | 9 | | --stray-vert | loose vertex count is 0 | 15 | | --lift-z | bounding box zmin is 0 | 16 | | --short-shoe | named shoes plant at z=0 | 16 | | --gap-board | board-to-post BVH gap | 17 | | --float-strap | strap-to-post BVH gap | 18 | | --yaw-boards | board AABB Y (orthogonal) | 19 |

+
--short-shoe lifts only the iron shoe plates. After zmin snap the post is the AABB zmin, so the AABB gate would still pass; the named shoe stations fail. --gap-board moves the board inner station outside the post. --float-strap adds Y offset to the U-wrap so it no longer bites. --yaw-boards restores a 0.12 rad yaw; the AABB secondary extent exceeds the thickness bound.

 
Run

 
blender --background --python signpost.py --
 blender --background --python signpost.py -- --skip-decimate
+blender --background --python signpost.py -- --stray-vert
+blender --background --python signpost.py -- --lift-z
+blender --background --python signpost.py -- --short-shoe
+blender --background --python signpost.py -- --gap-board
+blender --background --python signpost.py -- --float-strap
+blender --background --python signpost.py -- --yaw-boards
 blender --background --python signpost.py -- --output signpost.png

-
Smoke does not pass --output or --skip-decimate.

+
Smoke passes no flags.

 
Exit codes

-
File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path.

-
| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 3 distinct slots, or wood/board/metal faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file |

+
File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path. 15–19 are the hygiene and joint-fit family.

+
| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 3 distinct slots, or wood/board/metal faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file | | 15 | Hygiene (--stray-vert lands here) | | 16 | Grounded zmin / named shoes (--lift-z, --short-shoe) | | 17 | Board-to-post gap (--gap-board) | | 18 | Strap-to-post gap (--float-strap) | | 19 | Board yaw / AABB Y (--yaw-boards) |

     

     

       
Source

@@ -289,9 +306,11 @@ 
Source

 pipeline pieces: bmesh construction, UVs, three materials, high-to-low
 normal bake, LOD chain, convex collider, Unity glTF export.
 
-Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+Boards are axis-aligned. Finger tips are wedges whose base is the
+board's own section, not glued cubes. The cap is a 4-gon pyramid from
+the post half plus overhang, added after bevel. The post stays on the
+origin. Hygiene family 15–19: ``--stray-vert``, ``--short-shoe``,
+``--gap-board``, ``--float-strap``, ``--yaw-boards``.
 
 No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
@@ -311,6 +330,7 @@ 
Source

 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
@@ -321,18 +341,29 @@ 
Source

 
 POST_W = 0.118
 POST_H = 1.48
-CAP_H = 0.058
-SHOE_H = 0.048
-SHOE_SCALE = 1.34
+CAP_H = 0.075
+CAP_OVERHANG = 0.012
+SHOE_H = 0.042
+IRON_T = 0.014
+COLLAR_BITE = 0.004
+TENON = 0.005
 BOARD_T = 0.028
-BOARD_H = 0.112
-BOARD_A = (1.24, 0.62, 1.0, 0.12)
-BOARD_B = (1.00, 0.54, -1.0, -0.18)
-
-BBOX_TOL = 0.01
-OUTER_SIZE = (1.368, 0.201, 1.566)
-BASE_TRIS_MIN = 430
-BASE_TRIS_MAX = 580
+BOARD_H_A = 0.112
+BOARD_H_B = 0.100
+BOARD_A = (1.24, 0.62, 1.0)
+BOARD_B = (1.00, 0.54, -1.0)
+TIP_LEN = 0.070
+TIP_BITE = 0.004
+BAND_Z = 0.22
+LIFT_SHOE = 0.08
+GAP_BOARD = 0.12
+FLOAT_STRAP = 0.06
+YAW_FAIL = 0.12
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (1.260, 0.142, 1.551)
+BASE_TRIS_MIN = 320
+BASE_TRIS_MAX = 480
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -342,7 +373,7 @@ 
Source

 MATERIAL_COUNT = 3
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 140
+COLLIDER_TRIS_MAX = 180
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
 METAL_FACES_MIN = 24
@@ -353,6 +384,17 @@ 
Source

 BOARD_IDX = 1
 METAL_IDX = 2
 
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZMIN_EPS = 1e-4
+ZFIGHT_EPS = 0.002
+ZFIGHT_COS = 0.98
+SHOE_COUNT = 1
+SHOE_ZMIN_MAX = 0.002
+BOARD_GAP_MAX = 0.008
+STRAP_GAP_MAX = 0.008
+BOARD_DY_MAX = 0.055
+
 
 def eevee_engine_id():
     return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
@@ -379,13 +421,6 @@ 
Source

         eval_obj.to_mesh_clear()
 
 
-def deselect_all():
-    for ob in list(bpy.context.view_layer.objects):
-        if ob is None:
-            continue
-        ob.select_set(False)
-
-
 def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cube(bm, size=1.0)
     verts = geo["verts"]
@@ -400,50 +435,11 @@ 
Source

     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
-def add_cyl(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cone(
-        bm,
-        cap_ends=True,
-        cap_tris=False,
-        segments=segments,
-        radius1=radius,
-        radius2=radius,
-        depth=depth,
-    )
-    verts = geo["verts"]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
-    return verts
-
-
 def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cone(
         bm,
         cap_ends=True,
-        cap_tris=False,
+        cap_tris=segments > 4,
         segments=segments,
         radius1=radius1,
         radius2=radius2,
@@ -460,44 +456,49 @@ 
Source

     return verts
 
 
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 14
-    n_minor = 7
-    rings = []
-    for i in range(n_major):
-        u = i * (2.0 * math.pi / n_major)
-        ring = []
-        for j in range(n_minor):
-            v = j * (2.0 * math.pi / n_minor)
-            x = (major + minor * math.cos(v)) * math.cos(u)
-            y = (major + minor * math.cos(v)) * math.sin(u)
-            z = minor * math.sin(v)
-            ring.append(bm.verts.new((x, y, z)))
-        rings.append(ring)
-    bm.verts.ensure_lookup_table()
-    for i in range(n_major):
-        i2 = (i + 1) % n_major
-        for j in range(n_minor):
-            j2 = (j + 1) % n_minor
-            face = bm.faces.new(
-                (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
-            )
-            face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    return verts
+def add_collar(bm, z, half, t, h, mat_idx, closed=True, omit_x_sign=None, extra_y=0.0):
+    loc_y = half - COLLAR_BITE + t * 0.5 + extra_y
+    add_box(bm, (0.0, loc_y, z), (2.0 * half + t * 0.55, t, h), mat_idx)
+    add_box(bm, (0.0, -loc_y, z), (2.0 * half + t * 0.55, t, h), mat_idx)
+    loc_x = half - COLLAR_BITE + t * 0.5 + extra_y
+    for sx in (-1.0, 1.0):
+        if omit_x_sign is not None and sx == omit_x_sign:
+            continue
+        if not closed:
+            continue
+        add_box(
+            bm,
+            (sx * loc_x, 0.0, z),
+            (t, 2.0 * half + t * 0.15, h),
+            mat_idx,
+        )
 
 
-def add_square_band(bm, z, half, t, h, mat_idx):
-    metal = []
-    metal.extend(add_box(bm, (0.0, half + t / 2.0, z), (2.0 * half + 2.0 * t, t, h), mat_idx))
-    metal.extend(add_box(bm, (0.0, -(half + t / 2.0), z), (2.0 * half + 2.0 * t, t, h), mat_idx))
-    metal.extend(add_box(bm, (half + t / 2.0, 0.0, z), (t, 2.0 * half, h), mat_idx))
-    metal.extend(add_box(bm, (-(half + t / 2.0), 0.0, z), (t, 2.0 * half, h), mat_idx))
-    return metal
+def add_wedge_tip(bm, origin, sign, yaw, height, thickness, mat_idx):
+    rot = Euler((0.0, 0.0, yaw)).to_matrix()
+    hy = thickness * 0.5
+    hz = height * 0.5
+    sx = 1.0 if sign > 0.0 else -1.0
+    local = (
+        (0.0, -hy, -hz),
+        (0.0, hy, -hz),
+        (0.0, hy, hz),
+        (0.0, -hy, hz),
+        (sx * TIP_LEN, -hy, 0.0),
+        (sx * TIP_LEN, hy, 0.0),
+    )
+    verts = [bm.verts.new(rot @ Vector(p) + Vector(origin)) for p in local]
+    faces = (
+        (verts[0], verts[1], verts[2], verts[3]),
+        (verts[0], verts[4], verts[5], verts[1]),
+        (verts[3], verts[2], verts[5], verts[4]),
+        (verts[0], verts[3], verts[4]),
+        (verts[1], verts[5], verts[2]),
+    )
+    for fverts in faces:
+        face = bm.faces.new(fverts)
+        face.material_index = mat_idx
+    return verts
 
 
 def pack_uvs(bm, margin=0.08):
@@ -543,14 +544,19 @@ 
Source

             )
 
 
-def build_signpost_mesh(name, bevel_offset, bevel_segments):
+def build_signpost_mesh(
+    name,
+    bevel_offset,
+    bevel_segments,
+    short_shoe=False,
+    gap_board=False,
+    float_strap=False,
+    yaw_boards=False,
+):
     bm = bmesh.new()
     try:
         wood = []
-        boards = []
-        metal = []
         half = POST_W / 2.0
-
         wood.extend(
             add_box(
                 bm,
@@ -559,26 +565,6 @@ 
Source

                 WOOD_IDX,
             )
         )
-        wood.extend(
-            add_box(
-                bm,
-                (0.0, 0.0, POST_H + 0.014),
-                (POST_W * 1.16, POST_W * 1.16, 0.028),
-                WOOD_IDX,
-            )
-        )
-        wood.extend(
-            add_cone(
-                bm,
-                (0.0, 0.0, POST_H + 0.028 + CAP_H / 2.0),
-                POST_W * 0.72,
-                0.008,
-                CAP_H,
-                4,
-                WOOD_IDX,
-                euler=(0.0, 0.0, math.pi / 4.0),
-            )
-        )
 
         if bevel_offset > 0.0:
             edges = list({e for v in wood for e in v.link_edges})
@@ -594,76 +580,66 @@ 
Source

             for f in ret.get("faces") or []:
                 f.material_index = WOOD_IDX
 
-        for z, length, sign, yaw in (BOARD_A, BOARD_B):
-            eul = Euler((0.0, 0.0, yaw))
-            rot = eul.to_matrix()
-            inner = Vector((sign * (half - 0.016), 0.0, z))
-            center = inner + rot @ Vector((sign * length / 2.0, 0.0, 0.0))
-            boards.extend(
-                add_box(
-                    bm,
-                    (center.x, center.y, center.z),
-                    (length, BOARD_T, BOARD_H),
-                    BOARD_IDX,
-                    euler=(0.0, 0.0, yaw),
-                )
-            )
-            tip = inner + rot @ Vector((sign * (length + 0.004), 0.0, 0.0))
-            boards.extend(
-                add_box(
-                    bm,
-                    (tip.x, tip.y, tip.z),
-                    (0.088, BOARD_T, 0.088),
-                    BOARD_IDX,
-                    euler=(0.0, math.pi / 4.0, yaw),
-                )
-            )
-            t = 0.012
-            h = BOARD_H + 0.024
-            metal.extend(
-                add_box(
-                    bm,
-                    (sign * (half + t / 2.0), 0.0, z),
-                    (t, POST_W * 0.94, h),
-                    METAL_IDX,
-                )
-            )
-            metal.extend(
-                add_box(
-                    bm,
-                    (0.0, half + t / 2.0, z),
-                    (POST_W * 0.94, t, h),
-                    METAL_IDX,
-                )
-            )
-            metal.extend(
-                add_box(
-                    bm,
-                    (0.0, -(half + t / 2.0), z),
-                    (POST_W * 0.94, t, h),
-                    METAL_IDX,
-                )
-            )
+        cap_half = half + CAP_OVERHANG
+        add_cone(
+            bm,
+            (0.0, 0.0, POST_H + CAP_H / 2.0 - 0.004),
+            cap_half * math.sqrt(2.0),
+            0.018,
+            CAP_H,
+            4,
+            WOOD_IDX,
+            euler=(0.0, 0.0, math.pi / 4.0),
+        )
 
-        metal.extend(
+        yaw = YAW_FAIL if yaw_boards else 0.0
+        extra = GAP_BOARD if gap_board else 0.0
+        strap_extra = FLOAT_STRAP if float_strap else 0.0
+        specs = (
+            (BOARD_A[0], BOARD_A[1], BOARD_A[2], BOARD_H_A, BOARD_T),
+            (BOARD_B[0], BOARD_B[1], BOARD_B[2], BOARD_H_B, BOARD_T * 0.92),
+        )
+        for z, length, sign, bh, bt in specs:
+            inner = sign * (half - TENON + extra)
+            rect_len = length - TIP_LEN
+            center_x = inner + sign * rect_len / 2.0
             add_box(
                 bm,
-                (0.0, 0.0, SHOE_H / 2.0),
-                (POST_W * SHOE_SCALE, POST_W * SHOE_SCALE, SHOE_H),
+                (center_x, 0.0, z),
+                (rect_len, bt, bh),
+                BOARD_IDX,
+                euler=(0.0, 0.0, sign * yaw),
+            )
+            outer = inner + sign * rect_len - sign * TIP_BITE
+            add_wedge_tip(
+                bm,
+                (outer, 0.0, z),
+                sign,
+                sign * yaw,
+                bh,
+                bt,
+                BOARD_IDX,
+            )
+            add_collar(
+                bm,
+                z,
+                half,
+                IRON_T,
+                bh + 0.020,
                 METAL_IDX,
+                closed=True,
+                omit_x_sign=sign,
+                extra_y=strap_extra,
             )
-        )
-        metal.extend(add_square_band(bm, 0.22, half, 0.012, 0.028, METAL_IDX))
 
-        xs = [v.co.x for v in bm.verts]
-        ys = [v.co.y for v in bm.verts]
+        shoe_z = SHOE_H / 2.0 + (LIFT_SHOE if short_shoe else 0.0)
+        add_collar(bm, shoe_z, half, IRON_T, SHOE_H, METAL_IDX, closed=True)
+        add_collar(bm, BAND_Z, half, IRON_T, 0.028, METAL_IDX, closed=True)
+        add_collar(bm, 0.46, half, IRON_T, 0.028, METAL_IDX, closed=True)
+
         zs = [v.co.z for v in bm.verts]
-        rcx = 0.5 * (min(xs) + max(xs))
-        rcy = 0.5 * (min(ys) + max(ys))
         zmin = min(zs)
         for v in bm.verts:
-            v.co.x -= rcx
-            v.co.y -= rcy
             v.co.z -= zmin
             if v.co.z < 0.0:
                 v.co.z = 0.0
@@ -684,13 +660,25 @@ 
Source

     return out
 
 
-def principled(name, color, metallic, roughness):
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 6.0
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
     return mat
 
 
@@ -705,10 +693,11 @@ 
Source

 
 
 def world_bbox(obj):
-    corners = [obj.matrix_world @ Vector(c) for c in obj.bound_box]
-    xs = [c.x for c in corners]
-    ys = [c.y for c in corners]
-    zs = [c.z for c in corners]
+    mat = obj.matrix_world
+    pts = [mat @ v.co for v in obj.data.vertices]
+    xs = [p.x for p in pts]
+    ys = [p.y for p in pts]
+    zs = [p.z for p in pts]
     return (min(xs), min(ys), min(zs), max(xs), max(ys), max(zs))
 
 
@@ -771,10 +760,192 @@ 
Source

     return collider
 
 
+def face_area(me, poly):
+    vs = [me.vertices[i].co for i in poly.vertices]
+    if len(vs) < 3:
+        return 0.0
+    v0 = vs[0]
+    area = 0.0
+    for i in range(1, len(vs) - 1):
+        area += (vs[i] - v0).cross(vs[i + 1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for poly in me.polygons:
+        if all(i in member for i in poly.vertices):
+            return poly.material_index
+    return None
+
+
+def shell_bvh_gap(me, ga, gb):
+    bm_a = bmesh.new()
+    bm_b = bmesh.new()
+    try:
+        bm_a.from_mesh(me)
+        bm_b.from_mesh(me)
+        keep_a, keep_b = set(ga), set(gb)
+        drop_a = [f for f in bm_a.faces if not all(v.index in keep_a for v in f.verts)]
+        drop_b = [f for f in bm_b.faces if not all(v.index in keep_b for v in f.verts)]
+        if drop_a:
+            bmesh.ops.delete(bm_a, geom=drop_a, context="FACES")
+        if drop_b:
+            bmesh.ops.delete(bm_b, geom=drop_b, context="FACES")
+        if not bm_a.faces or not bm_b.faces:
+            return 1e9
+        tree = BVHTree.FromBMesh(bm_b)
+        best = 1e9
+        for v in bm_a.verts:
+            hit = tree.find_nearest(v.co)
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        for f in bm_a.faces:
+            hit = tree.find_nearest(f.calc_center_median())
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        return best
+    finally:
+        bm_a.free()
+        bm_b.free()
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, POST_H * 0.55))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
+def joint_audit(me):
+    groups = shells(me)
+    posts = []
+    boards = []
+    shoes = []
+    straps = []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        mat = mat_of(me, g)
+        if mat == WOOD_IDX and dz > 0.80 and dx < 0.22 and dy < 0.22:
+            posts.append((g, a))
+        elif mat == BOARD_IDX and dx > 0.25:
+            boards.append((g, a))
+        elif mat == METAL_IDX and a[2] < 0.08 and dz < 0.08:
+            shoes.append((g, a))
+        elif mat == METAL_IDX and a[2] > 0.70:
+            straps.append((g, a))
+    board_gap = 0.0
+    for bg, _ in boards:
+        best = 1e9
+        for pg, _ in posts:
+            best = min(best, shell_bvh_gap(me, bg, pg))
+        if best < 1e8:
+            board_gap = max(board_gap, best)
+    strap_gap = 0.0
+    for sg, _ in straps:
+        best = 1e9
+        for pg, _ in posts:
+            best = min(best, shell_bvh_gap(me, sg, pg))
+        if best < 1e8:
+            strap_gap = max(strap_gap, best)
+    board_dy = max((a[4] - a[1] for _, a in boards), default=0.0)
+    shoe_z = min((a[2] for _, a in shoes), default=1.0)
+    return {
+        "posts": len(posts),
+        "boards": len(boards),
+        "shoes": len(shoes),
+        "straps": len(straps),
+        "board_gap": board_gap if boards and posts else 1e9,
+        "strap_gap": strap_gap if straps and posts else 1e9,
+        "board_dy": board_dy,
+        "shoe_z": shoe_z,
+    }
+
+
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
-    img = bpy.data.images.new("SignpostNrm", size, size, alpha=True, float_buffer=False)
+    img = bpy.data.images.new("SignNrm", size, size, alpha=True, float_buffer=False)
     img.colorspace_settings.name = "Non-Color"
     nodes = target_mat.node_tree.nodes
     tex = nodes.new("ShaderNodeTexImage")
@@ -791,7 +962,8 @@ 
Source

     scene.cycles.device = "CPU"
     scene.cycles.samples = 1
     scene.cycles.use_denoising = False
-    deselect_all()
+    for ob in bpy.context.view_layer.objects:
+        ob.select_set(False)
     high.select_set(True)
     low.select_set(True)
     bpy.context.view_layer.objects.active = low
@@ -809,7 +981,8 @@ 
Source

 
 
 def export_unity(path, objects):
-    deselect_all()
+    for ob in bpy.context.view_layer.objects:
+        ob.select_set(False)
     for ob in objects:
         ob.select_set(True)
     bpy.context.view_layer.objects.active = objects[0]
@@ -823,16 +996,46 @@ 
Source

     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_shoe=False,
+    gap_board=False,
+    float_strap=False,
+    yaw_boards=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_signpost_mesh("SignpostLow", bevel_offset=0.004, bevel_segments=2)
-    high = build_signpost_mesh("SignpostHigh", bevel_offset=0.004, bevel_segments=4)
-    wood = principled("SignpostWood", (0.34, 0.18, 0.07, 1.0), 0.0, 0.62)
-    board = principled("SignpostBoard", (0.76, 0.58, 0.22, 1.0), 0.0, 0.52)
-    metal = principled("SignpostIron", (0.14, 0.145, 0.155, 1.0), 1.0, 0.38)
+    kw = dict(
+        short_shoe=short_shoe,
+        gap_board=gap_board,
+        float_strap=float_strap,
+        yaw_boards=yaw_boards,
+    )
+    low = build_signpost_mesh("SignpostLow", bevel_offset=0.004, bevel_segments=2, **kw)
+    high = build_signpost_mesh("SignpostHigh", bevel_offset=0.004, bevel_segments=4, **kw)
+    wood = principled(
+        "SignpostWood", (0.34, 0.18, 0.07, 1.0), 0.0, 0.62,
+        noise_scale=14.0, wear=(0.22, 0.10, 0.04, 1.0),
+    )
+    board = principled(
+        "SignpostBoard", (0.76, 0.58, 0.22, 1.0), 0.0, 0.52,
+        noise_scale=10.0, wear=(0.55, 0.38, 0.14, 1.0),
+    )
+    metal = principled(
+        "SignpostIron", (0.14, 0.145, 0.155, 1.0), 1.0, 0.38,
+        noise_scale=18.0, wear=(0.22, 0.18, 0.14, 1.0),
+    )
     assign_slots(low, wood, board, metal)
     assign_slots(high, wood, board, metal)
 
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += 0.05
+        low.data.update()
+
     if low.data is None or len(low.data.polygons) < 6:
         return fail("signpost mesh did not build", 3), None, None, None, None, None
 
@@ -864,7 +1067,7 @@ 
Source

     r2 = lod2_tris / base_tris if base_tris else 0.0
 
     collider_src = build_signpost_mesh(
-        "SignpostColSrc", bevel_offset=0.0, bevel_segments=1
+        "SignpostColSrc", bevel_offset=0.0, bevel_segments=1, **kw
     )
     collider = convex_hull_collider(collider_src, "SignpostCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
@@ -879,6 +1082,10 @@ 
Source

     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    jnt = joint_audit(low.data)
+
     print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
@@ -896,6 +1103,17 @@ 
Source

         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured posts={jnt['posts']} boards={jnt['boards']} "
+        f"shoes={jnt['shoes']} straps={jnt['straps']} "
+        f"board_gap={jnt['board_gap']:.5f} strap_gap={jnt['strap_gap']:.5f} "
+        f"board_dy={jnt['board_dy']:.4f} shoe_z={jnt['shoe_z']:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -932,6 +1150,32 @@ 
Source

             f"UV AABB overlap {overlap:.6f} > {UV_OVERLAP_MAX}",
             7,
         ), None, None, None, None, None
+    if (
+        bb[2] > ZMIN_EPS
+        or jnt["shoes"] < SHOE_COUNT
+        or jnt["shoe_z"] > SHOE_ZMIN_MAX
+    ):
+        return fail(
+            f"grounded zmin={bb[2]:.5f} shoes={jnt['shoes']} "
+            f"shoe_z={jnt['shoe_z']:.5f}",
+            16,
+        ), None, None, None, None, None
+    if jnt["boards"] < 2 or jnt["posts"] < 1 or jnt["board_gap"] > BOARD_GAP_MAX:
+        return fail(
+            f"board gap {jnt['board_gap']:.5f} boards={jnt['boards']} "
+            f"posts={jnt['posts']}",
+            17,
+        ), None, None, None, None, None
+    if jnt["straps"] < 1 or jnt["strap_gap"] > STRAP_GAP_MAX:
+        return fail(
+            f"strap gap {jnt['strap_gap']:.5f} straps={jnt['straps']}",
+            18,
+        ), None, None, None, None, None
+    if jnt["board_dy"] > BOARD_DY_MAX:
+        return fail(
+            f"board dy {jnt['board_dy']:.4f} > {BOARD_DY_MAX}",
+            19,
+        ), None, None, None, None, None
     if (
         abs(size_x - OUTER_SIZE[0]) > BBOX_TOL
         or abs(size_y - OUTER_SIZE[1]) > BBOX_TOL
@@ -965,6 +1209,16 @@ 
Source

         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"] or hyg["zero_area"]
+        or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -986,7 +1240,6 @@ 
Source

             ob.hide_viewport = True
 
     low.rotation_euler.z = math.radians(-12.0)
-    low.rotation_euler.x = math.radians(0.0)
 
     floor_me = bpy.data.meshes.new("Floor")
     bm = bmesh.new()
@@ -1078,14 +1331,24 @@ 
Source

     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--short-shoe", action="store_true")
+    p.add_argument("--gap-board", action="store_true")
+    p.add_argument("--float-strap", action="store_true")
+    p.add_argument("--yaw-boards", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_shoe=args.short_shoe,
+        gap_board=args.gap_board,
+        float_strap=args.float_strap,
+        yaw_boards=args.yaw_boards,
+    )
     if code:
         return code
     if args.output:
diff --git a/showcase/gallery.json b/showcase/gallery.json
index 6f06cb0e..682f2630 100644
--- a/showcase/gallery.json
+++ b/showcase/gallery.json
@@ -225,7 +225,7 @@
       "name": "signpost",
       "dir": "showcase/signpost",
       "teaches": "A procedural timber fingerboard signpost through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "witnessesFix": "Recomputed: 504 tris, three materials with 66 metal and 24 board faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.368×0.201×1.566 m, LOD ratios in band (5.2 COLLAPSE more aggressive on LOD2), convex collider 56 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.",
+      "witnessesFix": "Recomputed: 376 tris, three materials with 108 metal, 22 board and 60 wood faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.260×0.142×1.551 m at zmin 0, LOD ratios in band (5.2 COLLAPSE leaner on LOD1/LOD2), convex collider 52 tris, non-empty glTF. Hygiene all zero. Board-to-post gap 5 mm, strap gap 3 mm, board AABB Y 28 mm. --skip-decimate exits 9; --stray-vert 15; --lift-z / --short-shoe 16; --gap-board 17; --float-strap 18; --yaw-boards 19.",
       "hero": "docs/gallery/assets/signpost-hero.webp",
       "preview": "showcase/signpost/preview.webp",
       "tags": [
diff --git a/showcase/signpost/README.md b/showcase/signpost/README.md
index 6a66060f..20f024ef 100644
--- a/showcase/signpost/README.md
+++ b/showcase/signpost/README.md
@@ -1,10 +1,17 @@
 # Signpost
 
 A showcase piece, not an example. Procedural timber fingerboard
-signpost (square post, collar and pyramidal cap, two painted planks
-with diamond tips, iron shoe and straps) then the shipped pipeline:
-unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex
-collider, Unity glTF export.
+signpost (square post, pyramidal cap from the post half plus overhang,
+two axis-aligned painted boards with wedges cut from the board
+section, iron shoe collar and U-wrap straps) then the shipped
+pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain,
+convex collider, Unity glTF export.
+
+Boards are yaw 0. Finger tips are wedges whose base is the board's own
+thickness×height, bitten into the board so the base face is inside it.
+The cap is added after the post bevel. The post stays on the origin.
+Hygiene family 15–19: `--stray-vert`, `--lift-z` / `--short-shoe`,
+`--gap-board`, `--float-strap`, `--yaw-boards`.
 
 It asserts **budget conformance** of the generated result. It does not
 witness an API contract. "It rendered without error" is not a check.
@@ -14,6 +21,11 @@ witness an API contract. "It rendered without error" is not a check.
 `bake_normal_high_to_low.py`, `setup_bake_target_image.py`,
 `lod_chain.py` / `decimate_to_budget.py`, `convex_hull_collider.py`,
 `export_preset_unity.py` (helpers copied, not imported as a package).
+Hygiene combinatorics match `examples/mesh-hygiene-audit` (copied, not
+imported).
+
+Intended size: 1.48 m post, boards 0.62 m and 0.54 m, 0.118 m post
+stock; outer AABB 1.260 × 0.142 × 1.551 m.
 
 ## Budgets
 
@@ -22,39 +34,92 @@ materials, UVs, evaluated LOD, collider, or export file.
 
 | Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 430–580 | 504 / 504 / 504 |
-| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2183 / 0.2183 / 0.1746 |
-| Materials | exactly 3 distinct, ≥24 metal and ≥12 board faces | 3 slots, 66 metal, 24 board |
+| Base triangles | 320–480 | 376 / 376 / 376 |
+| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.4681 |
+| LOD2 ratio | 0.10–0.35 of base | 0.2181 / 0.2181 / 0.1649 |
+| Materials | exactly 3 distinct, ≥24 metal, ≥12 board, ≥12 wood | 3 slots, 108 metal, 22 board, 60 wood |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
-| Outer AABB | (1.368, 0.201, 1.566) m ± 0.01 | (1.3679, 0.2014, 1.5660), zmin 0 |
-| Collider tris | ≤ 140 | 56 |
-| Export | written, size > 0 | 45164 / 45164 / 45152 bytes |
+| Outer AABB | (1.260, 0.142, 1.551) m ± 0.015 | (1.2600, 0.1420, 1.5510), zmin 0 |
+| Collider tris | ≤ 180 | 52 |
+| Export | written, size > 0 | 35688 / 35688 / 35676 bytes |
+
+Base triangles dropped from **504 to 376** in the quality pass: glued
+diamond cubes and a solid shoe block became wedges and a four-plate
+collar. Outer AABB tightened from 1.368 × 0.201 × 1.566 m.
 
 DECIMATE COLLAPSE triangle counts are **not** identical across series —
-5.2.1 is more aggressive on LOD2. The gate is a ratio band, not an
+5.2.1 is leaner on LOD1 and LOD2. The gate is a ratio band, not an
 exact count. Bake pixels are stochastic; the gate is `has_data` plus
 operator `FINISHED`, not byte-identity. Construction uses no RNG.
 Export byte counts differ by 12 B on 5.2.1 (glTF serializer), not a
 gated axis.
 
-`--skip-decimate` skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and
-exit 9 fires. That is the named budget the falsifier violates.
+### Hygiene
+
+Recomputed from the generated mesh, not asserted about the script.
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Non-manifold edges | 0 | 0 |
+| Loose verts / edges | 0 / 0 | 0 / 0 |
+| Doubles merged at 1e-5 | 0 | 0 |
+| Zero-area faces | 0 | 0 |
+| N-gons | 0 | 0 |
+| Coplanar disjoint face pairs | 0 | 0 |
+| Grounded: `zmin` | within 1e-4 of 0 | 0.0000 |
+| Named shoe plates | ≥1, each `zmin` ≤ 0.002 | 4, 0.00000 |
+
+### Joint fit and orthogonal boards
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Board-to-post BVH gap | ≤ 0.008 m | 0.00500 |
+| Strap-to-post BVH gap | ≤ 0.008 m | 0.00300 |
+| Board AABB Y (axis-aligned) | ≤ 0.055 m | 0.0280 |
+
+### Falsifiers
+
+Each violates one named budget. All were run on 4.5.11, 5.1.2 and 5.2.1
+and returned the same code on each.
+
+| Flag | Budget violated | Exit |
+| --- | --- | --- |
+| `--skip-decimate` | LOD1 ratio band | 9 |
+| `--stray-vert` | loose vertex count is 0 | 15 |
+| `--lift-z` | bounding box `zmin` is 0 | 16 |
+| `--short-shoe` | named shoes plant at z=0 | 16 |
+| `--gap-board` | board-to-post BVH gap | 17 |
+| `--float-strap` | strap-to-post BVH gap | 18 |
+| `--yaw-boards` | board AABB Y (orthogonal) | 19 |
+
+`--short-shoe` lifts only the iron shoe plates. After zmin snap the
+post is the AABB `zmin`, so the AABB gate would still pass; the named
+shoe stations fail. `--gap-board` moves the board inner station outside
+the post. `--float-strap` adds Y offset to the U-wrap so it no longer
+bites. `--yaw-boards` restores a 0.12 rad yaw; the AABB secondary
+extent exceeds the thickness bound.
 
 ## Run
 
 ```bash
 blender --background --python signpost.py --
 blender --background --python signpost.py -- --skip-decimate
+blender --background --python signpost.py -- --stray-vert
+blender --background --python signpost.py -- --lift-z
+blender --background --python signpost.py -- --short-shoe
+blender --background --python signpost.py -- --gap-board
+blender --background --python signpost.py -- --float-strap
+blender --background --python signpost.py -- --yaw-boards
 blender --background --python signpost.py -- --output signpost.png
 ```
 
-Smoke does not pass `--output` or `--skip-decimate`.
+Smoke passes no flags.
 
 ## Exit codes
 
 File-local. `9` is a valid check code. `10` is reserved for
-`gallery_framing.check_framing` on the `--output` path.
+`gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
+hygiene and joint-fit family.
 
 | Code | Meaning |
 | --- | --- |
@@ -73,3 +138,8 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 12 | Bake did not finish or image has no data |
 | 13 | Export file missing or empty |
 | 14 | `--output` produced no file |
+| 15 | Hygiene (`--stray-vert` lands here) |
+| 16 | Grounded zmin / named shoes (`--lift-z`, `--short-shoe`) |
+| 17 | Board-to-post gap (`--gap-board`) |
+| 18 | Strap-to-post gap (`--float-strap`) |
+| 19 | Board yaw / AABB Y (`--yaw-boards`) |
diff --git a/showcase/signpost/preview.webp b/showcase/signpost/preview.webp
index 266e72f1c691a680167b862e5c7d5483f28c46a1..c8c1ef4e0ed08f2ba1bcc86da2c5875fd4d0dbbe 100644
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diff --git a/showcase/signpost/signpost.py b/showcase/signpost/signpost.py
index 82e6702f..27d53062 100644
--- a/showcase/signpost/signpost.py
+++ b/showcase/signpost/signpost.py
@@ -5,9 +5,11 @@
 pipeline pieces: bmesh construction, UVs, three materials, high-to-low
 normal bake, LOD chain, convex collider, Unity glTF export.
 
-Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+Boards are axis-aligned. Finger tips are wedges whose base is the
+board's own section, not glued cubes. The cap is a 4-gon pyramid from
+the post half plus overhang, added after bevel. The post stays on the
+origin. Hygiene family 15–19: ``--stray-vert``, ``--short-shoe``,
+``--gap-board``, ``--float-strap``, ``--yaw-boards``.
 
 No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
@@ -27,6 +29,7 @@
 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
@@ -37,18 +40,29 @@
 
 POST_W = 0.118
 POST_H = 1.48
-CAP_H = 0.058
-SHOE_H = 0.048
-SHOE_SCALE = 1.34
+CAP_H = 0.075
+CAP_OVERHANG = 0.012
+SHOE_H = 0.042
+IRON_T = 0.014
+COLLAR_BITE = 0.004
+TENON = 0.005
 BOARD_T = 0.028
-BOARD_H = 0.112
-BOARD_A = (1.24, 0.62, 1.0, 0.12)
-BOARD_B = (1.00, 0.54, -1.0, -0.18)
-
-BBOX_TOL = 0.01
-OUTER_SIZE = (1.368, 0.201, 1.566)
-BASE_TRIS_MIN = 430
-BASE_TRIS_MAX = 580
+BOARD_H_A = 0.112
+BOARD_H_B = 0.100
+BOARD_A = (1.24, 0.62, 1.0)
+BOARD_B = (1.00, 0.54, -1.0)
+TIP_LEN = 0.070
+TIP_BITE = 0.004
+BAND_Z = 0.22
+LIFT_SHOE = 0.08
+GAP_BOARD = 0.12
+FLOAT_STRAP = 0.06
+YAW_FAIL = 0.12
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (1.260, 0.142, 1.551)
+BASE_TRIS_MIN = 320
+BASE_TRIS_MAX = 480
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -58,7 +72,7 @@
 MATERIAL_COUNT = 3
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 140
+COLLIDER_TRIS_MAX = 180
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
 METAL_FACES_MIN = 24
@@ -69,6 +83,17 @@
 BOARD_IDX = 1
 METAL_IDX = 2
 
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZMIN_EPS = 1e-4
+ZFIGHT_EPS = 0.002
+ZFIGHT_COS = 0.98
+SHOE_COUNT = 1
+SHOE_ZMIN_MAX = 0.002
+BOARD_GAP_MAX = 0.008
+STRAP_GAP_MAX = 0.008
+BOARD_DY_MAX = 0.055
+
 
 def eevee_engine_id():
     return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
@@ -95,13 +120,6 @@ def evaluated_triangle_count(obj):
         eval_obj.to_mesh_clear()
 
 
-def deselect_all():
-    for ob in list(bpy.context.view_layer.objects):
-        if ob is None:
-            continue
-        ob.select_set(False)
-
-
 def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cube(bm, size=1.0)
     verts = geo["verts"]
@@ -116,50 +134,11 @@ def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
-def add_cyl(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cone(
-        bm,
-        cap_ends=True,
-        cap_tris=False,
-        segments=segments,
-        radius1=radius,
-        radius2=radius,
-        depth=depth,
-    )
-    verts = geo["verts"]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
-    return verts
-
-
 def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
     geo = bmesh.ops.create_cone(
         bm,
         cap_ends=True,
-        cap_tris=False,
+        cap_tris=segments > 4,
         segments=segments,
         radius1=radius1,
         radius2=radius2,
@@ -176,44 +155,49 @@ def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.
     return verts
 
 
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 14
-    n_minor = 7
-    rings = []
-    for i in range(n_major):
-        u = i * (2.0 * math.pi / n_major)
-        ring = []
-        for j in range(n_minor):
-            v = j * (2.0 * math.pi / n_minor)
-            x = (major + minor * math.cos(v)) * math.cos(u)
-            y = (major + minor * math.cos(v)) * math.sin(u)
-            z = minor * math.sin(v)
-            ring.append(bm.verts.new((x, y, z)))
-        rings.append(ring)
-    bm.verts.ensure_lookup_table()
-    for i in range(n_major):
-        i2 = (i + 1) % n_major
-        for j in range(n_minor):
-            j2 = (j + 1) % n_minor
-            face = bm.faces.new(
-                (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
-            )
-            face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    return verts
+def add_collar(bm, z, half, t, h, mat_idx, closed=True, omit_x_sign=None, extra_y=0.0):
+    loc_y = half - COLLAR_BITE + t * 0.5 + extra_y
+    add_box(bm, (0.0, loc_y, z), (2.0 * half + t * 0.55, t, h), mat_idx)
+    add_box(bm, (0.0, -loc_y, z), (2.0 * half + t * 0.55, t, h), mat_idx)
+    loc_x = half - COLLAR_BITE + t * 0.5 + extra_y
+    for sx in (-1.0, 1.0):
+        if omit_x_sign is not None and sx == omit_x_sign:
+            continue
+        if not closed:
+            continue
+        add_box(
+            bm,
+            (sx * loc_x, 0.0, z),
+            (t, 2.0 * half + t * 0.15, h),
+            mat_idx,
+        )
 
 
-def add_square_band(bm, z, half, t, h, mat_idx):
-    metal = []
-    metal.extend(add_box(bm, (0.0, half + t / 2.0, z), (2.0 * half + 2.0 * t, t, h), mat_idx))
-    metal.extend(add_box(bm, (0.0, -(half + t / 2.0), z), (2.0 * half + 2.0 * t, t, h), mat_idx))
-    metal.extend(add_box(bm, (half + t / 2.0, 0.0, z), (t, 2.0 * half, h), mat_idx))
-    metal.extend(add_box(bm, (-(half + t / 2.0), 0.0, z), (t, 2.0 * half, h), mat_idx))
-    return metal
+def add_wedge_tip(bm, origin, sign, yaw, height, thickness, mat_idx):
+    rot = Euler((0.0, 0.0, yaw)).to_matrix()
+    hy = thickness * 0.5
+    hz = height * 0.5
+    sx = 1.0 if sign > 0.0 else -1.0
+    local = (
+        (0.0, -hy, -hz),
+        (0.0, hy, -hz),
+        (0.0, hy, hz),
+        (0.0, -hy, hz),
+        (sx * TIP_LEN, -hy, 0.0),
+        (sx * TIP_LEN, hy, 0.0),
+    )
+    verts = [bm.verts.new(rot @ Vector(p) + Vector(origin)) for p in local]
+    faces = (
+        (verts[0], verts[1], verts[2], verts[3]),
+        (verts[0], verts[4], verts[5], verts[1]),
+        (verts[3], verts[2], verts[5], verts[4]),
+        (verts[0], verts[3], verts[4]),
+        (verts[1], verts[5], verts[2]),
+    )
+    for fverts in faces:
+        face = bm.faces.new(fverts)
+        face.material_index = mat_idx
+    return verts
 
 
 def pack_uvs(bm, margin=0.08):
@@ -259,14 +243,19 @@ def pack_uvs(bm, margin=0.08):
             )
 
 
-def build_signpost_mesh(name, bevel_offset, bevel_segments):
+def build_signpost_mesh(
+    name,
+    bevel_offset,
+    bevel_segments,
+    short_shoe=False,
+    gap_board=False,
+    float_strap=False,
+    yaw_boards=False,
+):
     bm = bmesh.new()
     try:
         wood = []
-        boards = []
-        metal = []
         half = POST_W / 2.0
-
         wood.extend(
             add_box(
                 bm,
@@ -275,26 +264,6 @@ def build_signpost_mesh(name, bevel_offset, bevel_segments):
                 WOOD_IDX,
             )
         )
-        wood.extend(
-            add_box(
-                bm,
-                (0.0, 0.0, POST_H + 0.014),
-                (POST_W * 1.16, POST_W * 1.16, 0.028),
-                WOOD_IDX,
-            )
-        )
-        wood.extend(
-            add_cone(
-                bm,
-                (0.0, 0.0, POST_H + 0.028 + CAP_H / 2.0),
-                POST_W * 0.72,
-                0.008,
-                CAP_H,
-                4,
-                WOOD_IDX,
-                euler=(0.0, 0.0, math.pi / 4.0),
-            )
-        )
 
         if bevel_offset > 0.0:
             edges = list({e for v in wood for e in v.link_edges})
@@ -310,76 +279,66 @@ def build_signpost_mesh(name, bevel_offset, bevel_segments):
             for f in ret.get("faces") or []:
                 f.material_index = WOOD_IDX
 
-        for z, length, sign, yaw in (BOARD_A, BOARD_B):
-            eul = Euler((0.0, 0.0, yaw))
-            rot = eul.to_matrix()
-            inner = Vector((sign * (half - 0.016), 0.0, z))
-            center = inner + rot @ Vector((sign * length / 2.0, 0.0, 0.0))
-            boards.extend(
-                add_box(
-                    bm,
-                    (center.x, center.y, center.z),
-                    (length, BOARD_T, BOARD_H),
-                    BOARD_IDX,
-                    euler=(0.0, 0.0, yaw),
-                )
-            )
-            tip = inner + rot @ Vector((sign * (length + 0.004), 0.0, 0.0))
-            boards.extend(
-                add_box(
-                    bm,
-                    (tip.x, tip.y, tip.z),
-                    (0.088, BOARD_T, 0.088),
-                    BOARD_IDX,
-                    euler=(0.0, math.pi / 4.0, yaw),
-                )
-            )
-            t = 0.012
-            h = BOARD_H + 0.024
-            metal.extend(
-                add_box(
-                    bm,
-                    (sign * (half + t / 2.0), 0.0, z),
-                    (t, POST_W * 0.94, h),
-                    METAL_IDX,
-                )
-            )
-            metal.extend(
-                add_box(
-                    bm,
-                    (0.0, half + t / 2.0, z),
-                    (POST_W * 0.94, t, h),
-                    METAL_IDX,
-                )
-            )
-            metal.extend(
-                add_box(
-                    bm,
-                    (0.0, -(half + t / 2.0), z),
-                    (POST_W * 0.94, t, h),
-                    METAL_IDX,
-                )
-            )
+        cap_half = half + CAP_OVERHANG
+        add_cone(
+            bm,
+            (0.0, 0.0, POST_H + CAP_H / 2.0 - 0.004),
+            cap_half * math.sqrt(2.0),
+            0.018,
+            CAP_H,
+            4,
+            WOOD_IDX,
+            euler=(0.0, 0.0, math.pi / 4.0),
+        )
 
-        metal.extend(
+        yaw = YAW_FAIL if yaw_boards else 0.0
+        extra = GAP_BOARD if gap_board else 0.0
+        strap_extra = FLOAT_STRAP if float_strap else 0.0
+        specs = (
+            (BOARD_A[0], BOARD_A[1], BOARD_A[2], BOARD_H_A, BOARD_T),
+            (BOARD_B[0], BOARD_B[1], BOARD_B[2], BOARD_H_B, BOARD_T * 0.92),
+        )
+        for z, length, sign, bh, bt in specs:
+            inner = sign * (half - TENON + extra)
+            rect_len = length - TIP_LEN
+            center_x = inner + sign * rect_len / 2.0
             add_box(
                 bm,
-                (0.0, 0.0, SHOE_H / 2.0),
-                (POST_W * SHOE_SCALE, POST_W * SHOE_SCALE, SHOE_H),
+                (center_x, 0.0, z),
+                (rect_len, bt, bh),
+                BOARD_IDX,
+                euler=(0.0, 0.0, sign * yaw),
+            )
+            outer = inner + sign * rect_len - sign * TIP_BITE
+            add_wedge_tip(
+                bm,
+                (outer, 0.0, z),
+                sign,
+                sign * yaw,
+                bh,
+                bt,
+                BOARD_IDX,
+            )
+            add_collar(
+                bm,
+                z,
+                half,
+                IRON_T,
+                bh + 0.020,
                 METAL_IDX,
+                closed=True,
+                omit_x_sign=sign,
+                extra_y=strap_extra,
             )
-        )
-        metal.extend(add_square_band(bm, 0.22, half, 0.012, 0.028, METAL_IDX))
 
-        xs = [v.co.x for v in bm.verts]
-        ys = [v.co.y for v in bm.verts]
+        shoe_z = SHOE_H / 2.0 + (LIFT_SHOE if short_shoe else 0.0)
+        add_collar(bm, shoe_z, half, IRON_T, SHOE_H, METAL_IDX, closed=True)
+        add_collar(bm, BAND_Z, half, IRON_T, 0.028, METAL_IDX, closed=True)
+        add_collar(bm, 0.46, half, IRON_T, 0.028, METAL_IDX, closed=True)
+
         zs = [v.co.z for v in bm.verts]
-        rcx = 0.5 * (min(xs) + max(xs))
-        rcy = 0.5 * (min(ys) + max(ys))
         zmin = min(zs)
         for v in bm.verts:
-            v.co.x -= rcx
-            v.co.y -= rcy
             v.co.z -= zmin
             if v.co.z < 0.0:
                 v.co.z = 0.0
@@ -400,13 +359,25 @@ def build_signpost_mesh(name, bevel_offset, bevel_segments):
     return out
 
 
-def principled(name, color, metallic, roughness):
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 6.0
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
     return mat
 
 
@@ -421,10 +392,11 @@ def assign_slots(obj, wood, board, metal):
 
 
 def world_bbox(obj):
-    corners = [obj.matrix_world @ Vector(c) for c in obj.bound_box]
-    xs = [c.x for c in corners]
-    ys = [c.y for c in corners]
-    zs = [c.z for c in corners]
+    mat = obj.matrix_world
+    pts = [mat @ v.co for v in obj.data.vertices]
+    xs = [p.x for p in pts]
+    ys = [p.y for p in pts]
+    zs = [p.z for p in pts]
     return (min(xs), min(ys), min(zs), max(xs), max(ys), max(zs))
 
 
@@ -487,10 +459,192 @@ def convex_hull_collider(obj, name):
     return collider
 
 
+def face_area(me, poly):
+    vs = [me.vertices[i].co for i in poly.vertices]
+    if len(vs) < 3:
+        return 0.0
+    v0 = vs[0]
+    area = 0.0
+    for i in range(1, len(vs) - 1):
+        area += (vs[i] - v0).cross(vs[i + 1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for poly in me.polygons:
+        if all(i in member for i in poly.vertices):
+            return poly.material_index
+    return None
+
+
+def shell_bvh_gap(me, ga, gb):
+    bm_a = bmesh.new()
+    bm_b = bmesh.new()
+    try:
+        bm_a.from_mesh(me)
+        bm_b.from_mesh(me)
+        keep_a, keep_b = set(ga), set(gb)
+        drop_a = [f for f in bm_a.faces if not all(v.index in keep_a for v in f.verts)]
+        drop_b = [f for f in bm_b.faces if not all(v.index in keep_b for v in f.verts)]
+        if drop_a:
+            bmesh.ops.delete(bm_a, geom=drop_a, context="FACES")
+        if drop_b:
+            bmesh.ops.delete(bm_b, geom=drop_b, context="FACES")
+        if not bm_a.faces or not bm_b.faces:
+            return 1e9
+        tree = BVHTree.FromBMesh(bm_b)
+        best = 1e9
+        for v in bm_a.verts:
+            hit = tree.find_nearest(v.co)
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        for f in bm_a.faces:
+            hit = tree.find_nearest(f.calc_center_median())
+            if hit[0] is not None:
+                best = min(best, hit[3])
+        return best
+    finally:
+        bm_a.free()
+        bm_b.free()
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, POST_H * 0.55))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
+def joint_audit(me):
+    groups = shells(me)
+    posts = []
+    boards = []
+    shoes = []
+    straps = []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        mat = mat_of(me, g)
+        if mat == WOOD_IDX and dz > 0.80 and dx < 0.22 and dy < 0.22:
+            posts.append((g, a))
+        elif mat == BOARD_IDX and dx > 0.25:
+            boards.append((g, a))
+        elif mat == METAL_IDX and a[2] < 0.08 and dz < 0.08:
+            shoes.append((g, a))
+        elif mat == METAL_IDX and a[2] > 0.70:
+            straps.append((g, a))
+    board_gap = 0.0
+    for bg, _ in boards:
+        best = 1e9
+        for pg, _ in posts:
+            best = min(best, shell_bvh_gap(me, bg, pg))
+        if best < 1e8:
+            board_gap = max(board_gap, best)
+    strap_gap = 0.0
+    for sg, _ in straps:
+        best = 1e9
+        for pg, _ in posts:
+            best = min(best, shell_bvh_gap(me, sg, pg))
+        if best < 1e8:
+            strap_gap = max(strap_gap, best)
+    board_dy = max((a[4] - a[1] for _, a in boards), default=0.0)
+    shoe_z = min((a[2] for _, a in shoes), default=1.0)
+    return {
+        "posts": len(posts),
+        "boards": len(boards),
+        "shoes": len(shoes),
+        "straps": len(straps),
+        "board_gap": board_gap if boards and posts else 1e9,
+        "strap_gap": strap_gap if straps and posts else 1e9,
+        "board_dy": board_dy,
+        "shoe_z": shoe_z,
+    }
+
+
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
-    img = bpy.data.images.new("SignpostNrm", size, size, alpha=True, float_buffer=False)
+    img = bpy.data.images.new("SignNrm", size, size, alpha=True, float_buffer=False)
     img.colorspace_settings.name = "Non-Color"
     nodes = target_mat.node_tree.nodes
     tex = nodes.new("ShaderNodeTexImage")
@@ -507,7 +661,8 @@ def bake_normal(high, low):
     scene.cycles.device = "CPU"
     scene.cycles.samples = 1
     scene.cycles.use_denoising = False
-    deselect_all()
+    for ob in bpy.context.view_layer.objects:
+        ob.select_set(False)
     high.select_set(True)
     low.select_set(True)
     bpy.context.view_layer.objects.active = low
@@ -525,7 +680,8 @@ def bake_normal(high, low):
 
 
 def export_unity(path, objects):
-    deselect_all()
+    for ob in bpy.context.view_layer.objects:
+        ob.select_set(False)
     for ob in objects:
         ob.select_set(True)
     bpy.context.view_layer.objects.active = objects[0]
@@ -539,16 +695,46 @@ def export_unity(path, objects):
     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_shoe=False,
+    gap_board=False,
+    float_strap=False,
+    yaw_boards=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_signpost_mesh("SignpostLow", bevel_offset=0.004, bevel_segments=2)
-    high = build_signpost_mesh("SignpostHigh", bevel_offset=0.004, bevel_segments=4)
-    wood = principled("SignpostWood", (0.34, 0.18, 0.07, 1.0), 0.0, 0.62)
-    board = principled("SignpostBoard", (0.76, 0.58, 0.22, 1.0), 0.0, 0.52)
-    metal = principled("SignpostIron", (0.14, 0.145, 0.155, 1.0), 1.0, 0.38)
+    kw = dict(
+        short_shoe=short_shoe,
+        gap_board=gap_board,
+        float_strap=float_strap,
+        yaw_boards=yaw_boards,
+    )
+    low = build_signpost_mesh("SignpostLow", bevel_offset=0.004, bevel_segments=2, **kw)
+    high = build_signpost_mesh("SignpostHigh", bevel_offset=0.004, bevel_segments=4, **kw)
+    wood = principled(
+        "SignpostWood", (0.34, 0.18, 0.07, 1.0), 0.0, 0.62,
+        noise_scale=14.0, wear=(0.22, 0.10, 0.04, 1.0),
+    )
+    board = principled(
+        "SignpostBoard", (0.76, 0.58, 0.22, 1.0), 0.0, 0.52,
+        noise_scale=10.0, wear=(0.55, 0.38, 0.14, 1.0),
+    )
+    metal = principled(
+        "SignpostIron", (0.14, 0.145, 0.155, 1.0), 1.0, 0.38,
+        noise_scale=18.0, wear=(0.22, 0.18, 0.14, 1.0),
+    )
     assign_slots(low, wood, board, metal)
     assign_slots(high, wood, board, metal)
 
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += 0.05
+        low.data.update()
+
     if low.data is None or len(low.data.polygons) < 6:
         return fail("signpost mesh did not build", 3), None, None, None, None, None
 
@@ -580,7 +766,7 @@ def check(skip_decimate):
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
     collider_src = build_signpost_mesh(
-        "SignpostColSrc", bevel_offset=0.0, bevel_segments=1
+        "SignpostColSrc", bevel_offset=0.0, bevel_segments=1, **kw
     )
     collider = convex_hull_collider(collider_src, "SignpostCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
@@ -595,6 +781,10 @@ def check(skip_decimate):
     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    jnt = joint_audit(low.data)
+
     print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
@@ -612,6 +802,17 @@ def check(skip_decimate):
         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured posts={jnt['posts']} boards={jnt['boards']} "
+        f"shoes={jnt['shoes']} straps={jnt['straps']} "
+        f"board_gap={jnt['board_gap']:.5f} strap_gap={jnt['strap_gap']:.5f} "
+        f"board_dy={jnt['board_dy']:.4f} shoe_z={jnt['shoe_z']:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -648,6 +849,32 @@ def check(skip_decimate):
             f"UV AABB overlap {overlap:.6f} > {UV_OVERLAP_MAX}",
             7,
         ), None, None, None, None, None
+    if (
+        bb[2] > ZMIN_EPS
+        or jnt["shoes"] < SHOE_COUNT
+        or jnt["shoe_z"] > SHOE_ZMIN_MAX
+    ):
+        return fail(
+            f"grounded zmin={bb[2]:.5f} shoes={jnt['shoes']} "
+            f"shoe_z={jnt['shoe_z']:.5f}",
+            16,
+        ), None, None, None, None, None
+    if jnt["boards"] < 2 or jnt["posts"] < 1 or jnt["board_gap"] > BOARD_GAP_MAX:
+        return fail(
+            f"board gap {jnt['board_gap']:.5f} boards={jnt['boards']} "
+            f"posts={jnt['posts']}",
+            17,
+        ), None, None, None, None, None
+    if jnt["straps"] < 1 or jnt["strap_gap"] > STRAP_GAP_MAX:
+        return fail(
+            f"strap gap {jnt['strap_gap']:.5f} straps={jnt['straps']}",
+            18,
+        ), None, None, None, None, None
+    if jnt["board_dy"] > BOARD_DY_MAX:
+        return fail(
+            f"board dy {jnt['board_dy']:.4f} > {BOARD_DY_MAX}",
+            19,
+        ), None, None, None, None, None
     if (
         abs(size_x - OUTER_SIZE[0]) > BBOX_TOL
         or abs(size_y - OUTER_SIZE[1]) > BBOX_TOL
@@ -681,6 +908,16 @@ def check(skip_decimate):
         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"] or hyg["zero_area"]
+        or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -702,7 +939,6 @@ def render_still(low, wood, tex, path, engine):
             ob.hide_viewport = True
 
     low.rotation_euler.z = math.radians(-12.0)
-    low.rotation_euler.x = math.radians(0.0)
 
     floor_me = bpy.data.meshes.new("Floor")
     bm = bmesh.new()
@@ -794,14 +1030,24 @@ def main():
     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--short-shoe", action="store_true")
+    p.add_argument("--gap-board", action="store_true")
+    p.add_argument("--float-strap", action="store_true")
+    p.add_argument("--yaw-boards", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_shoe=args.short_shoe,
+        gap_board=args.gap_board,
+        float_strap=args.float_strap,
+        yaw_boards=args.yaw_boards,
+    )
     if code:
         return code
     if args.output: