Hi Peter, is it possible for you to send the file to me somehow so I can test with it?

Just file size alone is not a full indicator of complexity - for example if the file contains a large number of instanced repeated objects, those will expand into totally separate objects when you open it in MoI and so the actual data being handled could actually be many times 24MB.

Or it could be possible that there is some problem with the STEP import resulting in some kind of slightly mangled object which then causes a sort of "run-away" excessively dense mesh being created as a side effect from that.

It's hard for me to know for sure without being able to test it myself.

That file may be too big to send to me by e-mail, is it possible to use a file sharing service and then send the link to me at moi@moi3d.com ?

Another issue may actually be your 6-core machine - when generating meshes MoI does make use of multiple cores and that does have a side effect of consuming more memory at once as well. It is possible to limit the number of cores being used, to do that go to Options > General and push the "Edit .ini file" button. In the text file that comes up, go to the [Mesh Export] section and find the setting for ThreadLimit= and put in ThreadLimit=1 and see if that makes any difference or not.

Thanks,
- Michael

Hi Michael,
with Threadlimit=1 it works for selected pieces. Thank you!!. Could I send you the completly file by e-mail (9MB zip)?
Other way I will send a link.

Peter

Hi Peter, 9MB might barely fit through e-mail, please go ahead and give it a try: moi@moi3d.com

Thanks!

- Michael

Hi Peter, thanks for sending me the 3DM file through e-mail, I've already sent you back a reply but basically it's not a Mac-specific issue, this particular file is unusually memory consumptive and kind of sluggish generating the mesh on Windows as well.

It seems that the file has excessively dense UV trim curves in it, my guess is that probably the original STEP file had a too small value for its file tolerance labeled in its header - currently the STEP importer uses whatever tolerance is specified in the file itself when it has to do some calculations on the data (particularly when creating UV curves from the 3D edge curve data), and if the tolerance labeled in the file has been set to some kind of unusually small value it can result in strange heavy UV geometry. Anyway, that's my guess on what is happening, we can sort it out further through e-mail.

Thanks,
- Michael