Hi Allan,

> I mean : geometry is okay, but the grouping information, that
> is an important aspect in upcoming Moi3d and fundametal in
> Houdini, could be not ignored or just displaying names, that is:
> groups are empty at current state.

I see... But MoI does actually write the object names to the IGES file.

For example if I load the IGES file you posted into Rhino, you can see the name comes through into there, here is a screenshot of Rhino to show this:



If Houdini ignores the names, I don't know what I can do to fix that - that's something that you're going to need to talk to the Houdini developers about to get improved in Houdini.


Also one other note - it's pretty common for programs to try and automatically join individual surfaces in an IGES file together since often times a solid is stored in an IGES file as individual surfaces. So in some cases with surfaces that touch each other like you've got, a program may decide to combine those 2 objects together into 1 single new combined object and that could case the names to go away in some cases.

If you have any control over turning off any automatic joining process for IGES imports, that could help.

- Michael