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alpha material mental ray

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Gabriel Burciu
alpha material mental ray
on Oct 28, 2016 at 2:18:08 pm

Hi ,
I have a scene where there is a window. What I want is to have behind the glass a plane with a material that creates an alpha channel so I can composite inside the room another scene. Because of the scene background I can't get the alpha from the window so the easiest way would be if i can create a plane behind the window that mental ray would render as transparent alpha and ignore entirely what is behind the plane.

Any sugestions?


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