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I have never filmed a wedding, but here are some tips on shooting video in general. 1. Get a good tripod. This is critical if you are doing panning shots. I use a 3-way fluid pan head. 2. Don't zoom or pan too fast. If you feel like you are panning too slow, that is about the right speed. Even though it feels really slow, it won't be when you are watching it ...
Blender, which is free and open-source, can do difference matte keying. I don't know if it's better or worse than After Effects' keyer because I haven't used it before.
It is not possible to use blending modes in a 3D scene. What can be done though, is to use several scenes or 3D objects with a scan line renderer and a cam. Each of those are merged with the blending mode of choice after the scan line renderer in 2d.
This effect occurs if the cell is screened as bitmap. It should be able to avoid it if you activate 3D Rasterization. Click the "3D" checkbox in the Replicator Controls.
Seems like Cinelerra can. Haven't checked how well it works though, I've been wanting to install it for quite some time but never got around to doing it yet.
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