particular with opacity mask

[azloep]

anyone help?

[suztv]

I think that what you are asking is if you can have an object from a footage file become the obscuration layer?

If that is true then you will either have to re-render the clip with that objects alpha channel alone (if it is from a 3D or other compositing program). Then create a comp with that objects footage and then place on your timeline right on top of your existing footage. Then in particular select that comp as your obscuration layer - this is located under "visibility"

If your footage is of live action or doesn't come with an alpha channel or green screen then you will have to rotoscope the object.

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