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material alpha occlusion 'punch through'

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Hi there;

In the distant past I remember setting up a material that would let an object with the material applied 'punch' an alpha hole through the scene - the material would occlude other objects behind it and render the object as an empty hole. But for the life of me I can't remember how to do it. Are there any limitations (eg GI) on this method?

Any help would be greatly appreciated.


EDIT: Ha I found it - set diffuse mask to 1.0. Easy!

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Ola Rory!

Yes, diffuse mask..

Btw: try to play with the new Render Layer options, you can do tons of new operations, a mask to each element in scene, everything in passes..



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