Michael
>> That will import quads or triangles (not n-gons) from an .obj file.
importObj supports n-gons :)

Sonk
>> When I import my OBJ I get a strange error.
All polygon points must lay in the same plane, or you will get Geometry error.
In this case script tries to create a curved surface through those points.

>> The mesh is 816 polygons and when I run the Subd converter the mesh just disappear.
I'll check it.