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Object that creates alpha
Hi!
My problem is a little hard to discribe (especially in English), but here we go.
I have a scene with a building with windows. I want to render the scene to composit it with real footage of someone behind the window.
Is there a way to create a plane or whatever that creates alpha for its position? I don’t want to see the rear of the building, but have an image that is transparent inside the windows, so I can composit it with the footage inside AfterEffects.Hope that was understandable… 🙂
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3 Replies
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Yes, I just did this exact thing myself. You crate a plane and apply the video footage to the plane as a material.
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That was my first Idea too, but I’d like to have the possibility to adjust the layers seperately while doing color correction etc.
Oh, but I can render them seperately, can’t I? -
If your building is just a facade with no walls inside you could give it a compositing tag and assign an object buffer. Then add the same object buffer in Render Settings (Render Settings>Multipass>Add object buffer).
That won’t work if there are interior walls. In that case you’d have to put planes in the windows and assign an object buffer to the planes.
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