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+bvhtree cache (if the derived model doenst gets destroyed then the same BVHtree can be used) this was needed to allow shrinkwrap constraint to be usable. It has been ready for a long time.. but only got merged now, for 2.49.
To have the 50% faster nearest_surface point. Changed mesh_faces_nearest_point to return the face normal instead of collision normal
BKE_bvhutils.h and intern/bvhutils.c