Hi Drakon, re: IGS versus 3DM

Typically IGES format only contains individual surfaces instead of solids, similar to if your model had been separated or "exploded" into individual surface sheets that are not glued to one another along their edges anymore.

So when MoI reads in an IGES file, it will go through a joining process where it glues those surfaces together to form a solid again.

That joining process is not likely to be needed with 3DM format, because 3DM is more likely to have fully joined solids stored in it rather than individual surfaces stored within the file.

So there is some advantage to 3DM over IGES since the 3DM import will involve one less mechanism being applied to it at import time into MoI. That joining procedure can get to be fairly time consuming on highly complex models.

But unless your models are of a significantly high complexity it is not likely to be a big issue.

So I would think that probably just using your current IGS export should be fine.

- Michael