How can these two Geometries collide?

challenge

17-09-2008 04:06:57

I create a Bezier Patch to simulate the ground and create a taper to simulate the aiguille. Now I use entityInformer createStaticTriangleMesh() to create a Geometry for the ground. And I need the aiguille to drill into the ground, what do you think I can use to create the Geometry for the aiguille?
Thanks very much