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Skinned Mesh Intersection methods

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Hi I've been programming a game engine with C# and MDX for awhile now, and I've gotten to the point where skinned mesh picking is necessary (for level editing and gameplay) Basically, I was wondering what methods there are to do fast ray->skinned mesh intersection checks The vertices are transformed using a vertex shader, so the only thing exposed to me (as far as I know) is the static mesh. I was considering a heirarchy composed of bounding spheres/boxes but i was wondering if there is a better method or a more accurate method. my goal is a fast method

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http://www.fi.muni.cz/~ptx/PA158/Papers/Animation/eg05electronic.pdf

So far this is the only viable solution found, so if I get it done in c# maybe I'll post a tutorial :p

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