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Volumetric fog (froxel-based) #4

Description

@proggeramlug

Priority: Medium | Effort: Large

Replace the current 1D exponential fog (in TAA pass) with proper 3D froxel-based volumetric fog. Supports light shafts through fog, local fog volumes, and density variation.

Current state

  • Height-based exponential fog in TAA pass (fog_density, fog_color, fog_height_falloff)
  • Works but is a flat uniform haze, no volumetric scattering

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