Hi Jon, the problem is that your . obj file contains 3D model data in the form of a faceted polygon mesh. That's a different type of 3D data than what MoI is designed to work with at modeling time (NURBS surfaces and solids).

You would need to use a polygon mesh editing program to open and work with that kind of data, not MoI.

You can go the other direction, starting in MoI and exporting .obj - MoI will dice up spline surfaces into faceted polygons and output those polygons to an .obj file. But it is not easy to go the other direction and automatically fit large smooth surfaces to an already diced up bunch of triangles.

There is an exception to that - if your polygon mesh is designed to be used as a sub-d control cage then you can use the sub-d converter which is new in MoI v4, under SubD > Create > From file.

However, your example .obj file above is not one that was designed for sub-d smoothing.

- Michael