Larry Childs did a super accurate Mazda rotor housing dwg using Solid
Works.
I imported it into Rhino and rendered it.

The step worked great Larry. No missing surfaces.
  >From now on we will use step.

Thanks Larry. Beautiful work.
-- Paul Lamar ...No rotor no motor.

Paul how big is the file? Could you post it?
Bill Jepson


I did but here it is again. It was zipped. Does your ISP do zip? :)

You should stop up and see Larry.

Paul Lamar ...No rotor no motor.

Paul,
On the step file format, it works well for a single part, but if the file is
an assembly of parts, it combines them into a single part that cannot be
taken apart. I think assemblies will have to be done as iges still.
Larry

Rhino can explode it into 1393 surfaces and rejoin it if you wish.
Your using the wrong 3D dwg program. Just kidding :)

What we can do is; if it is an assemble of parts is, step
the parts individually so to speak.