I am trying to create a compound part of multiple shell elements. However when I select all the shells elements and create the compound part, the compound part is not visible after being created.
The shells were imported as an “.igs” file, which was created using Autocad by drawing the basic geometry of two H-profile steel section and then extruded and exported to the “.igs” file format.
Two pictures are provided below showing where I create the compound part and then showing where the compound parts is not present anymore.
I experience similar also, it seems Iges file of surface model in PrePoMax have problem of coordinate tolerances. However, a solid model (closed surface) not shown any issue related. Usually i do simple export an Iges file successfully loaded to Step file by feature available, then re-imported.
I tried exporting all the parts into step files using PrePoMax and then importing them back and creating the compound, and it worked. So, I am wondering if this should be a standard procedure. I can force each .igs file to be opened and served in a step file before importing it into PrePoMax.
Do we have some other .igs files that cause problems?
all iges 2d surface files may have problem in further to modify, maybe it’s due to precision as described in OpenCascade document links. Good ideas to strictly opened as step files by converting internally when the problem is in 2d iges file limitation itself, and it can not be fixed.
I had the same issue with some proprietary files I worked recently. If I used IGES format in the shells, the compound part would disappear but the same did not happen if I exported it as STEP from the beginning.
