Somewhere between HyperMesh 11 and 11.0.103, Altair altered* the import feature so that IGES geometry now imports as solids instead of surfaces. This isn’t necessarily a bad thing, as any engineer who’s had to switch back and forth between meshing software and CAD software to determine whether a particular part is hollow or not will tell you.
It does, however, make generating surface meshes more tedious than the previous import behavior. Here’s how to return the original surface import, courtesy of HyperWorks FEA Specialist Imran Pahsa:
- Ensure HyperMesh isn’t currently running
- On Windows 64-bit systems, navigate to C:\Program Files\Altair\11.0\io\afc_translators\bin\win64 and open the file iges_reader.ini in a text editor
- On the @SkipCreationOfSolid line, replace “off” with “on” as shown below:
- Save iges_reader.ini.
- Relaunch HyperMesh.
IGES files should now import as surfaces.
UPDATE: You can find the corresponding .ini file by the same name for any HyperMesh version number at C:\Program Files\Altair\VersionNumber\io\afc_translators\bin\win62. The procedure is otherwise the same.
This method is confirmed to work for versions 12* & 13* also.
*What a neat alliteration