VolumeRender and VolumeRenderCustom shaders, the four Fog Marching
materials, ZoneRenderer's FogMaterial/FogFarFadeFraction and its
_DepthCeiling/_DepthBlend writes, the ARPG scene values, and the
Volumetric.cginc _TintExponent, texFlow and tintGradient (with its
commented-out caller). The live nebula is VolumeCloudRenderer + CloudShader.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>