From a0b4ca03e2c052525123677a738e50338cd3ef99 Mon Sep 17 00:00:00 2001
From: Brandel Zachernuk <brandel@apple.com>
Date: Thu, 12 Feb 2026 16:25:30 -0800
Subject: [PATCH] Introduces lighting

Added the environmentMap attribute and environmentMapReady promise to the IDL,
Added initial language about the use of a PBR shading model and IBL.

fixes 48
fixes 47
---
 index.html | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/index.html b/index.html
index 07b63f2..4f697a3 100644
--- a/index.html
+++ b/index.html
@@ -384,8 +384,12 @@ <h2>
           readonly attribute Promise&lt;HTMLModelElement&gt; ready;
           readonly attribute DOMPointReadOnly boundingBoxCenter;
           readonly attribute DOMPointReadOnly boundingBoxExtents;
+
           attribute DOMMatrixReadOnly entityTransform;
 
+          attribute USVString environmentMap;
+          readonly attribute <span data-x="idl-Promise">Promise</span>&lt;undefined> <span data-x="dom-model-environmentMapReady">environmentMapReady</span>;
+
         };
       </pre>
       <aside class="issue" data-number="42"></aside>
@@ -417,10 +421,14 @@ <h2>
       <h2>
         Rendering
       </h2>
+      <p>The model SHOULD be rendered according to a realtime, physically-based rendering (PBR) shading model, and lit by an image-based light.</p>
+
+      <h3>Environment map</h3>
+      <p>If provided, an environment map MUST be interpreted as an equirectangular environment map. If an environmentMap is not specified, the User Agent MUST provide an appropriate map.</p>
+
+
       <aside class="issue" data-number="1"></aside>
       <aside class="issue" data-number="5"></aside>
-      <aside class="issue" data-number="48"></aside>
-      <aside class="issue" data-number="47"></aside>
       <h3>
         Orientation/camera
       </h3>
@@ -450,6 +458,7 @@ <h2>
         Events
       </h2>
       <aside class="issue" data-number="26"></aside>
+      <p> The <code data-x="dom-model-environmentMapReady">environmentMapReady</code> <code data-x="idl-Promise">Promise</code> resolves when an environment map resource has been loaded, or is rejected if the resource is unable to be loaded.</p>
     </section>
     <section>
       <h2>