Mask Material (matte alpa, black in alpha, black hole)

[dennisvolkerts]

Hi, is there something like a mask material? no shadows, black in alpha.
In Maya its called a black hole witch basically just makes it black in the Alpha channel

thnx alot

[Chad Holton]

Hello - I like to use the flat material for this. Works great and renders fast.

[dennisvolkerts]

Hello - I like to use the flat material for this. Works great and renders fast.

Yes, but how to let it show as black in Alpha?

[Chad Holton]

I'm not sure what you mean then. I create a black and white rendering using the flat material in KeyShot then use it as a mask in a compositing program.  Can you share a screenshot or two showing what you're trying to do?