http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=545743#Post545743

When I did it....
FBX to GR2 (LSTOOLS)
Import via resource editor via Create Item Wizard then create a template. And

Animations were not possible last I checked (is a bit ago now). And the bullet physics had some issues just because it LOADS doesn't mean it works (sadly) especially problematic are collision meshes you want to use with the AI grid, stairs, floors etc.

It would be nice if someone could put this in a proper tutorial, I was too lazy and others apparently too. In the end it seems to be lost on page 8 ;P

Also I could export working (AI Grid related) collisions basically only raw from Cinema4D which has own bullet physics exporter, but I had to rotate the model used for the collision mesh 180ｰ for some reason... overall all these issues meant I dropped modding this entirely. RadGameTools makes modding games a pain