Position of ray intersection?

Hey guys!!

Does anyone know how to get the position of a ray intersection??

ie - Say I had sphere with plane directly underneath it.
I then cast a ray directly down and wanted to return the position of the ray intersection with this plane.

Does anyone know how to do this??, or has done anything similar??

Any help would be fantastic!!

Cheers

Ben

What do you need sphere for?

Do you want to test meshes or nurbs?