How can I make a composition movie with blender like this :
I would use the sequence editor, Use Translate http://wiki.blender.org/index.php/Manual/Using_VSE#Input_Strip_Properties_Panel the camera 2 by 1/3 width, (say 200 pixiels), alpha over it on top of cam1, and then repeat for cam 3, offsetting cam 3 by 400 pixels.
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