Froxel volumetric fog. Reads frame.hdr + frame.gbuffer.depth +
frame.shadowMap + the lighting feature's persistent camera/light uniform
handles, writes the fogged HDR back into frame.hdr. Register AFTER
DeferredLightingFeature (and after godrays/clouds if both are used).
Froxel volumetric fog. Reads
frame.hdr+frame.gbuffer.depth+frame.shadowMap+ the lighting feature's persistent camera/light uniform handles, writes the fogged HDR back intoframe.hdr. Register AFTER DeferredLightingFeature (and after godrays/clouds if both are used).