Hi,
Recently we have to gamma/exposure up some of the multimattes to address certain edging issue. We find when doing that (exposure up multimattes) there are sparse noise in, for example, the green channel like green speckles. These multimattes are material ID mattes.
For example, a car seat that is assigned with VrayMtl 1 with mat id 2 for multimatte 1.
When render the car from an exterior angle, I see sparse green speckles where the seat should be completely occluded by the exterior car paint. Again, these speckles are not visible to bare eyes until I exposure/gamma up the multimatte channel in Nuke.
Is it normal in Vray to output multimattes this way? I expect if an object is behind solid (non-transparent) objects, its material matte should be completely black?
Thanks,
Jason
Recently we have to gamma/exposure up some of the multimattes to address certain edging issue. We find when doing that (exposure up multimattes) there are sparse noise in, for example, the green channel like green speckles. These multimattes are material ID mattes.
For example, a car seat that is assigned with VrayMtl 1 with mat id 2 for multimatte 1.
When render the car from an exterior angle, I see sparse green speckles where the seat should be completely occluded by the exterior car paint. Again, these speckles are not visible to bare eyes until I exposure/gamma up the multimatte channel in Nuke.
Is it normal in Vray to output multimattes this way? I expect if an object is behind solid (non-transparent) objects, its material matte should be completely black?
Thanks,
Jason
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