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as title, ive not found any explanation of how we should do fog/could/smoke as a pass and sucessfully add it back to the render in post.. ive been rendering seperately with the scene as a black matte, however if you screen or add it in PS, you lose any self shadowing and "mass" (Add is the suggested method in the vray documentation) if you overlay it as a normal layer, and use the alpha channel, its either invisible or just wrong.
given its all maths, there must be a "right" way to do it? seems silly using different compositing methods depending on the density of the volume, or to be fiddling around with multiple copies of a layer or heavily correcting the levels of the rgb or alpha to get close to original.
given its all maths, there must be a "right" way to do it? seems silly using different compositing methods depending on the density of the volume, or to be fiddling around with multiple copies of a layer or heavily correcting the levels of the rgb or alpha to get close to original.
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