Hi I`m only wondering if I can perform per triangle collision testing on a bump-mapped sphere(don`t consider the performance issue) ? Thanks, Fredrik

Yeah, sure. Tesselate the sphere enough to add the bumps as a geometry displacement, displace the right bits by the right amount, and you end up with a general mesh of triangles.

You may want to scale a sphere so that it totally encloses the old sphere + bumps, and use that as a higher level collision geometry.

Actually, if you look into normal mapping and parallax mapping a faster / procedural solution may suggest itself, saving you tesselating the sphere.