Juan Pablo Bouza has a nice short writeup on how to use Blender, the pre-eminent open source 3d rendering and animation tool, with Ardour, so that they share a common timeline.
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I tested the Ardour/Blender combo as described by Senor Bouza. Worked perfectly. Blender is an awesome program, it’s quite impressive to watch the two apps play nice together.
Btw, Blender is becoming a capable video editor.