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This is probably something a lot of people are already doing, but I just recently figured it out....

I was bemoaning the lack of good object/material alphas with Maxwell because the mat and object ID passes were giving me randomly assigned colours that needed to be manually selected in Photoshop, which of course meant a severe quality loss of the edges of anything that wasn't perfectly sharp.

Then I realized I could borrow a trick from Vray and set the Mat and Obj ID colours to *pure* R, G, and B values to get two 3-mask alphas out of each of those render elements. I wrote a bit about it on my blog, been very useful to me anyway!

http://blog.simmsimaging.com/?p=327

very nice trick! Thanks for sharing

Tanks !

hehe, similar to V-Ray's Multimatte element.

sandykoufax wrote:hehe, similar to V-Ray's Multimatte element.

Yep, exactly like that. That's where I stole the concept

I do it this way, I call them 'RGB mattes', not sure if theres a proper name for this.. cool post

cool, thanks.