composite behind footage

[Guacomodo]

What do you mean by composit behind?
Just create a mask that will cut away the part of the 3d object that will be behind the footage.

[Micah-H]

Example (http://www.oktobor.com/#/work/m1_orange/)

here is an example if you watch about half way through where the dad and the kid are at the desk, the text is composited behind there layer??!?! how could I go about accomplishing that?

I dont see a simple mask working

[Guacomodo]

You have to animate the mask to match the footage over time.
http://www.youtube.com/watch?v=FrmND8QdGz4
This should help you a bit.

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