Hi Mike, usually there is a method that can be used to glue the individual surfaces back into a solid again. Is that not happening in your software? Which software are you using?

There are a couple of different ways that stuff can be stored in an IGES file, the most common is separate surfaces which MoI uses right now.

But it is also possible to store a solid in an IGES file, which maintains the connections between surfaces. This is not used quite as commonly as surfaces, but it would be possible for me to add an option to allow IGES exports using this style if it would help. I have attached a sample file test186.igs - can you please try this file and let me know if that comes through into your software as a single solid instead of individual surfaces?

> Is the MoI modeling done in Solids++?

Yes, it is. Although Solids++ is similar in some ways to Granite, Parasolid, or ACIS it is not quite exactly the same - it is not as focused on "parametric" or "feature based" solid modeling as much as those ones are.

- Michael