Hi Rudy, OBJ and STL files contain polygon mesh data, that's a type of 3D data made up of lots of little flat facets. So a sphere in one of those files is made up of many hundreds or even thousands of little flat pieces. MoI is not designed to work with that type of model data, MoI is focused on using spline surfaces so for example a sphere in MoI is created as just one sphere surface, not a whole bunch of little flat pieces.

So in general such files are not suitable for loading into MoI, you need to work with that type of data in a polygon mesh modeling program instead of in MoI. Trying to work with a model in MoI made up of hundreds of thousands of little polygons as individual trimmed spline surfaces results in a very heavy and unwieldy object.

If the polygons are relatively sparse then it could be possible in some cases to use Max's OBJ importer plug-in which you can get from his file archive site here: http://moi.maxsm.net/media/files/ , find the one labeled ImportObj.v.1.5.2015.09.10.zip and there are instructions for installing plug-ins here: http://moi3d.com/wiki/FAQ#Q:_How_do_I_install_a_plug-in_script.3F

But again it's a different type of model data than what MoI is designed to work with.

- Michael