I’m modeling a character in 3dmax 8 now,
does unity support a model with open edges? i have an obj that intersect with the char, the i delete the polygon that is inside the char body.
also what’s the general step taken for animation?
what to use? bones/ biped? can do IK/ not?
does it support multi ID for the material?
thx a lot
Open edges are supported. It’s a game engine so it’s vital to do optimization like open edges.
Just be sure that they don’t show in an animation. maybe it’s easier to do a closed mesh (complete with non-intersecting areas) if your animation benefits from it. That depends on the complexity of model and animation, though. So you’ll ave to find that out for youself.
I don’t work with 3DS righ now but All your Character Studio or Puppetshop (or whatever) specific things probably won’t export. You need to bake them before exporting. The manual has all the infos you need 
On the multi ID issue - no idea. multiple UV sets are supported, though.