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fix(shader-transitions): show the from-scene at gravitational-lens start #1579

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fix(shader-transitions): show the from-scene at gravitational-lens start #1579

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8 changes: 7 additions & 1 deletion packages/shader-transitions/src/shaders/registry.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,13 @@ const shaders: Record<string, ShaderDef> = {
"float shift=pull*.02/(dist+.2);" +
"float r=texture2D(u_from,clamp(v_uv-uv*(warpStr+shift),0.,1.)).r;" +
"float b=texture2D(u_from,clamp(v_uv-uv*(warpStr-shift),0.,1.)).b;" +
"vec3 lensed=vec3(r,A.g,b)*horizon;" +
// The horizon term darkens the center to black, but it is not gated by
// progress, so at progress 0 the from-scene rendered as a black-hole
// vignette instead of the clean outgoing frame. Ramp the darkening in from
// progress 0 so lensed == from-scene at the transition start, matching
// every other shader in this file.
"float horizonRamp=smoothstep(0.,.3,u_progress);" +
"vec3 lensed=vec3(r,A.g,b)*mix(1.,horizon,horizonRamp);" +
"gl_FragColor=vec4(mix(lensed,B.rgb,smoothstep(.3,.9,u_progress)),1.);}",
},

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