Is there a simple way to collide to CSGBrushes?

I'm working on automatically exporting some pathfinding information for the AI I am working on, and I've run into a little stumbling block. I cant seem to figure out how to collide two CSGBrush instances (they represent convex 3D shapes I believe)

Is there some function that I'm missing, or some simple way that I overlooked? I wouldnt imagine that colliding 2 convex 3d shapes would be THAT hard.

Thanks in advance for any helpful hints. :)