From DWG to (STEP or IGES or SAT)

[Mannshoch]

I't is not required to have any other Information than the 3D-Data.

And does it also work with Proxy object?

Currently I have access to AutoCAD but even If I export to DXF (2000 or 2018) or IGES , The IGES seems not possible to export (no proper body found) adn the DXF seems not readable eg for FreeCAD.

At moment the only way to get 3D models is with Inventor.

What is the best way to get all 3D-Objects (Mesh, brep, swept-solid, CSG) into a neutral file?

[Mannshoch]

Could I create some TestData that may be usefull for you? I have access to autoCAD and Inventor.

[rurban]

Sure. I don't have access to AutoCAD nor Inventor

[Mannshoch]

For Inkscape I created these files: https://gitlab.com/inkscape/inbox/-/issues/2076#note_309337210 (at that time I had only access to AutoCAD LT)
If you wish I could create something like that for you. I'm not a developer but if you give me details, example or other kind of advice I will create sample files for you.