Premultiply problems

May 04

Premultiply problems

I’ve come across this several times but not found a good solution.. I often get gaps between an object in let’s say pass A that is obscured by another object which gets rendered in pass B (so the foreground object is seen in pass B but black in pass A’s RGBA).

I try all combinations of using premultiply on the read node, or the premult node after a read node, variations with unpremult and merging the two using ‘matte’ or ‘over’ etc.

If I’d use other compositing software with the same outputs it doesn’t happen as much, or a lot less visible at least. Has anyone else come across this?

I’m outputting renders from mental ray inside maya.

Thanks!

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Hasta La Motion!