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ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/Volumetrics/VolumeVoxelization.compute

         float  z             = z0 + halfDZ;
         float3 voxelCenterWS = rayOriginWS + z * rayUnDirWS; // Works due to the length of of the dir
 
+        // TODO: define a function ComputeGlobalFogCoefficients(float3 voxelCenterWS),
+        // which allows procedural definition of extinction and scattering.
         float3 voxelScattering = _GlobalScattering;
         float  voxelExtinction = _GlobalExtinction;