• You will need the free OBJ import and export plug-ins from Habware:
  • For Max 3
  • For Max 4 & 5
  • For Max 6 & 7

Importing

• Select EXACTLY the following options:
  
  
  
  
• Next, you may have to add a 'Smooth' modifier to tell Max to smooth-shade instead of flat-shade the polygonal surface.

Exporting

• Select EXACTLY the following options:
  
  
  
  
• Max will sometimes mix up quad UV co-ordinates on export, possibly due to the use of 'quad patches'. When a corrupt object like this occurs in a max scene it can often be fixed by attaching it to another piece of geometry, such as a sphere, and then detaching it again. This appears to overwrite the corruption and solve the export problem. If not, change the 'Faces:' option to 'Triangles' from 'Quads' and the problem should be resolved (note that quads will triangulated in this case), or simply triangulate the problem quads in Max.