Using 3d models for maps

[Nikademis]

I have been using 3D Max for about a year now and thought it would be nice to be able to being some of my work that I have done into a map. I have a few buildings that are 3d, meaning you can walk inside of them as if walking into a real building. Is this possible?

[Zorchenhimer]

You can use the models in the map, however, there is currently no collision detection for them.  That effectively makes models useless for things like buildings and structures.