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Mike Douglas avatar image
Mike Douglas asked

Stacked materials and alpha?

Hey there, I'm fairly new to Arnold. I'm wanting to stack 2 textures and have the top one have some transparency (a mouth that will swap textures so it animates).

When I add the mouth overtop, its alpha actually cuts through both textures and makes that part of the geometry disappear. Is there a way to prevent this?


The alpha for the mouth is a separate B&W image and is hooked up to Geometry > Cutout Opacity. I've added a C4DtoA tag to the geo and have turned off Opaque. See attached image. On a related note, can Arnold see the transparency in an image without generating a B&W matte? Thanks very much!


arnold-alpha-setup.jpg

shadersalpha
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Stephen Blair avatar image
Stephen Blair answered

Use the alpha as the mix of the layer shader.

1633352214959.png

Or you could use the Image node in single-channel mode to get just the Alpha channel.


1633352214959.png (58.7 KiB)
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