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Texture space collision detection and GLSL

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Hi, I need some help with glsl and 3d texture mapping. I display a Volume using viewport aligned slices (using a 3d texture); besides that I would like to draw some polygons (a triangle mesh) so I would like to know when those polygons are textured with the volume 3d texture; it`s like some kind of “texture mapping based collision detection”, any ideas how to do that?, and how to get the collision info back from the GPU to the CPU?....thanks, Jose.

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