Basic 3d comp


I’m new to nuke and have been trying to put together a basic composite, however I’m stuck..

I have….

1/ Background footage.

2/ Some cg to go over that background.

3/ Then a foreground with a sequence of alpha channels to use as a mask for the foreground.

How do I go about getting the alpha channels to mask out the foreground?

I can do this in PS, AE, Combustion and Fusion.. however I’m struggling here.

any help is greatly appreciated…

many thanks,

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