Internal Collision Detection

[ThreeMarks]

Hi,

I've got a problem with collision detection of which I am struggling to find a solution.

In the simplest case, I would have a sphere whose movement would be constrained inside a closed arbitrarily-shaped object.

I have been looking into BSP trees which split the shape into chunks for fast detection. However, I get the impression that this would only work for sphere outside of the object.

Is it possible that I can un fact still use a bsp setup. Or does anybody know of a way that I can do _internal_ collision detection.

Thanks,

ThreeMarks