CubeTextureNode: Support CubeRefractionMapping.

[Mugen87]

Related issue: #28785

Description

CubeTextureNode currently only supports CubeReflectionMapping. This PR adds support for CubeRefractionMapping.

@sunag The code works if you choose CubeRefractionMapping when creating the material. When using CubeReflectionMapping and switching to CubeRefractionMapping via the GUI, the material should update when material.needsUpdate is set to true. This does not work yet so the mapping does not change. Is there some caching mechanism in place that dees not detect the mapping change of the used cube texture? WebGLRenderer checks the mapping value if an environment map is in place during the program cache key computation so it does not miss this use case.

three.js/src/renderers/webgl/WebGLPrograms.js

Line 207 in 6b23527

envMapMode: HAS_ENVMAP && envMap.mapping,

Side note: For the further development process it would be good to have an example for each material that covers most material features. Something like the * variations examples that we used to have in context of WebGLRenderer or the material browser in the documentation. For now I have added webgpu_materials_basic next to the existing webgpu_materials_toon and webgpu_materials_matcap.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

Filesize dev	Filesize PR	Diff
683.5 kB (169.2 kB)	683.5 kB (169.2 kB)	+0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Filesize dev	Filesize PR	Diff
460.6 kB (111.1 kB)	460.6 kB (111.1 kB)	+0 B

[sunag]

I push a fix RenderObject.getMaterialCacheKey() should take care of that, in case of NodeMaterial the cache key should come from customProgramCacheKey() of material.*Node properties.