I try to give a short good explanation:
Scene with life vootage:
(1) a sofa with a object comming from behind of it and move on the sofa.
(2) I build a plane as the shape as the sofa, put a use background shader with Render stats > cast shadows > Off. I do this so the object won't be visable if its behind the sofa.
First time I render in passes:
Got background layer with the camera plane of the vootage + shadow layer + diffuse + occ and spec.
For the diffuse, occlusion and specular layers I don't want the plane with use background shader be visable in the render so "I have to remove from the specific layer" but I can't do this because I need it (reason see nr 2*)
How can I do this so it won't be visable during the occlusion render but still can use it so a part of the object won't be visable when a part is behind the sofa? :argh::arteest:
ps: I hope I'm clear enough :blush: if not please say so and I try to explain it better.