i have worked some engines , for putting collision for model , added collision boxes in 3ds max it self and import to engine using tool of engine
collisions are working perfectly
if anyone used like this in unity 3d , help me out…
no it does not work like that you cant use 3ds max colliders you need to assign the colliders in unity its relatively simple and painless… 
right i am using carom coin
for that i need to set exact collider
i used sphere collider
which leads me problem with collision with hole
can u tell me what type collider should i use and
how can i scale the collision meshs in all the directions
mesh collider should do the trick but its more memory hungry especially if your using the iphone avoid using it if you can…
If you feel like setting colliders in max (I do), just set another box, sphere, etc… for the collider, import it in unity, and let a script get all objects with name “collider_XXXX” or whatever name you wnat and convert them into colliders it is fairly easy.
HexDump.