The NASTRAN format is an ASCII based file commonly used by a number of CAD packages and pre-processing software. It supports feature curves. The current importer only recognizes shell (two-dimensional face) type elements so volume meshes cannot be imported using this format. Patch definitions are supported by this format as well.
When selecting a single NASTRAN file during surface import, the Import surface options dialog will appear as follows:
The choice for the Boundary Mode and Units can be made from the appropriate pull down menu. Optional choices for the preferred units, opening a geometry scene and printing surface mesh diagnostics can also be done.
When selecting more than one NASTRAN file in the Open dialog, the Import surface options dialog will appear as follows:
In this case, an additional choice for the Region Mode can be made in order to determine how the regions are demarcated.