I have problem about CarTerrianExample.

Why when I use other .ASE file that is not terrain.ASE. It does not have collision with other body.
I think this mistake may be when I create .ASE from 3DSMax.
How to create .ASE file that can make the correct collision?
Or I have some other mistake please answer me. I want to import .ASE to make Geom in Odejava.
Thank you verry much.