I'm building a composite material in 3DS Max and I'd like to add a MASK to a layer. I'm wondering...does the mask need to be an entirely separate image? Or is there a way to plug in the alpha channel of let's say...a targa or another 32-bit image? It doesn't seem very resourceful to need to create and use another image.
![CompMat](http://www.ajv3d.com/images/CompMat)
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