Hi macray,

> so I wonder why the differences in file size are so big...

It's hard to say without seeing an actual file to examine...

It could be possible that the STEP file is set up with several parts repeated in it using something like a block definition and then instances of that. That kind of instancing system helps to reduce file size quite a bit since all the instances share the same full object data.

MoI does not currently have an instancing system like that, so probably when that gets imported into MoI everything basically expands into just regular copied geometry.

In the future I do want to add an instancing system to MoI.


But I'm not totally sure that is the particular issue that you're seeing or not, without seeing any actual files I can only guess.

- Michael