I just stumbled across an open-source 3d physics engine for Flash that is able to compute positions and rotations in 3D engines such as Papervision3D, Sandy and Away 3D. It is still in development but I am hoping to look more into it over the next little while. Write-up, source and some tutorials can be found at : http://seraf.mediabox.fr/wow-engine/as3-3d-physics-engine-wow-engine/
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