Computer science project... flash actionscript help needed! collision detection!?

I'm working on a CSC project. I'm doing Object Oriented Programming with a 3d fly-through. There is a movie clip on stage and I need to somehow add points whenever that movie clip pes through one of the objects from the OOP. I have the score box and code working; however, I can't get the adding right. Can anyone help with OOP 3d collision detection?? Please and thank you!