Help with Collision Model

So. I’m making a Hockey map for fun. I dont think to be released. But I’ve modeled a Hockey Net out and some chairs in C4d. What confuses me is how to create a collision model. Can I do it in C4d? If I can how? I am also using Milkshape can I do it on there? If so how? Please explain in depth. I’m new at modeling for this type of stuff.

[editline]30th April 2015[/editline]

Nevermind, I figured it out. I Might make a tutorial for people who struggle since I cant find any videos. But I found a old thread that helped me out. I had to assign to the same smoothing group not different ones.