I have an interior scene in witch I want to have atmospheric falloff (dust effect). I've created an object that contains my room and I gave it a volume scatter shader (I'm working in Cycles).
The problem that I have is that my scene is very big and I need to render seperate layers. How do I deal with my volume in such a case ? I can't add it to each layer because when I combine them the volume will be to dense. I tried adding it only to the lights layer but it doesn't work. As I said, it's a very big scene and I need to light it with a sun (can't use a spot light) so world volumetrics can't help.
I can do that in the compositor with my Z pass but this is not the answer I'm looking for.
I hope you understand the question.