Examples: Add webgpu_caustics and shadow revisions#30962
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sunag
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webgpu_causticswebgpu_caustics and shadow revisions
📦 Bundle sizeFull ESM build, minified and gzipped.
🌳 Bundle size after tree-shakingMinimal build including a renderer, camera, empty scene, and dependencies.
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Good to know it worked with volumetric lighting.
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This might be the coolest thing I've seen a while. Blender's Cycles struggles to render caustics in a performant render and WebGPU can do it in realtime. I'm probably just going to move to Three.js for renders at this point |
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Is it expected for the dragon shadow to look like this now? 
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It was expected because at some point the color blending was removed, but it doesn't look so nice in this example because of the model, so I created an example with both approaches. #30984 |
This was referenced Apr 24, 2025
RuthySheffi
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Jun 5, 2025
* `material.shadowPositionNode` renamed to `material.receivedShadowPositionNode` * add `shadow.mapType` * add `material.castShadowPositionNode` * add `webgpu_caustics` example * update title * add stats * use webgpu * add `webgpu_volumetric_caustics` example * updates * Update puppeteer.js * Update puppeteer.js * Update webgpu_volume_caustics.html * fix shadow-map alpha * add glass example * Update webgpu_shadowmap_opacity.jpg * Update webgpu_volume_caustics.html
RuthySheffi
pushed a commit
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Jun 5, 2025
* `material.shadowPositionNode` renamed to `material.receivedShadowPositionNode` * add `shadow.mapType` * add `material.castShadowPositionNode` * add `webgpu_caustics` example * update title * add stats * use webgpu * add `webgpu_volumetric_caustics` example * updates * Update puppeteer.js * Update puppeteer.js * Update webgpu_volume_caustics.html * fix shadow-map alpha * add glass example * Update webgpu_shadowmap_opacity.jpg * Update webgpu_volume_caustics.html
Methuselah96
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Nov 1, 2025
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| const chromaticAberrationOffset = normalView.z.pow( - .9 ).mul( .004 ); | ||
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| const causticProjection = vec3( | ||
| texture( causticMap, textureUV.add( vec2( chromaticAberrationOffset.x.negate(), 0 ) ) ).r, | ||
| texture( causticMap, textureUV.add( vec2( 0, chromaticAberrationOffset.y.negate() ) ) ).g, | ||
| texture( causticMap, textureUV.add( vec2( chromaticAberrationOffset.x, chromaticAberrationOffset.y ) ) ).b | ||
| ); |
Contributor
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@sunag It seems like there might be a typo here. chromaticAberrationOffset is a float, but is being accessed with .x and .y?
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Description
I created a approach for caustic effects using the same shadow-map pass, without affecting the functionality of the current shadow map. Which seems to have a good performance.
Live example
Live example + volumetric lighting
three.js.webgpu.-.volumetric.caustics.-.Google.Chrome.2025-04-19.15-30-21.mp4
Summary
material.receivedShadowPositionNode