RendererUtils: Honor fog.

[Mugen87]

Fixed #30177

Description

The PR makes sure RendererUtils honors fog definitions.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.4 79.05	339.4 79.05	+0 B +0 B
WebGPU	487.25 135.14	487.34 135.17	+90 B +25 B
WebGPU Nodes	486.72 135.04	486.81 135.07	+90 B +24 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.3 112.11	465.3 112.11	+0 B +0 B
WebGPU	557.41 150.83	557.5 150.86	+90 B +28 B
WebGPU Nodes	513.49 140.61	513.58 140.64	+90 B +29 B

[Mugen87]

@sunag Unfortunately, this PR exhibits an issue with toggling fog: If you render the shadow pass with disabled fog and then restore the setting for the beauty pass, you end up with no fog in the beauty pass since the caching system does not detect the change in the scene. If you call Nodes.updateFog() in RenderUtils, the issue is fixed however there is now a constant object creation and deletion overhead in updateFog() every frame.

Maybe we can store the created fogNode in updateFog() in a separate cache so we don't create it over and over again.

[sunag]

I'll check that out.