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Odd alpha-artefacts with matte-materials?

Posted: Wed Feb 12, 2014 3:28 pm
by tailorstore
Hey!

Alright, I'm gonna get right down to it. We are in the process of trying to set up Octane to match our needs. Right now I need to get a clean alpha-channel, with objects masking and getting masked out, keeping the Octane DoF and all nice things Octane offers. However I keep running into a problem; when I apply a matte-material and hit render, I get this weird.. shadow(?).. residue of some sort.

I really don't get what's happening here, anyone? See images below.

The black material pictured
Image

The weird alpha of the object
Image

The final desired "piece" to be masked
Image

Re: Odd alpha-artefacts with matte-materials?

Posted: Thu Feb 13, 2014 1:33 pm
by tailorstore
Never mind, I seem to have found a solution. If I put a mask material on objects I don't want, and a spec material on the things I do want, the alpha comes out clean.