ID channel to mask the smoke

[themaxxer]

it worked with a VrayAtmospehre element, but I had to increase the multiplier quite a lot.

thanks for all replys and ideas.

best regards
themaxxer

[Ivaylo Katev]

ok, i'm not sure whether this is what you need, but with VRaySelfIllumination and VRayLighting render elements + geometry mode i got the attached results.