MoI's kernel is NOT ACIS, but Solids++........
The default MoI format is 3dm.
When importing, there are "2 things" to look into (IMO)
1= WHAT you are importing.
2= FROM WHERE you are importing it.
MoI's importers are 3rd party, so they are little programs that read the different formats.
What? Solid entities you may try STEP. That will try to maintain the original defined solid object. Surfaces and curve entities, I would look at iges. SAT and others I would look more at where they come from.
So from where? if you can find out the app that created the files, that can lead you towards what format will best bring in the file. ACIS or Parasolids or was it a third party export also, etc........
So iges, will have a good definition of surfaces and curves etc, and try to do "stitching" and such on import, to make joined surfaces and solids and line joins etc...
STEP will try to maintain solids and original stitching params etc (So from other apps, you can see very coarse seems etc, when tolerances are different.)
ACIS is it's own animal and third party exporters and importers can create "breaks", or surface trims where the original file had none. (nothing really wrong with those, unless they will interfere with further modeling, etc)
Also, some of these formats can be "custom". So a particular company can have a proprietary "ACIS" SAT format, which can further make problems with importing a "SAT" from that type of app (Same goes for STEP)
So, if you can have enough information about the "2 questions", that can lead you towards which format is best. If YOU ARE DOING the file format conversion, then you should have those answers already.
2 cents.
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