Field quantities are defined on a unique reference name selection. You can use the entire reference mesh or only parts of the reference mesh to form a reference named selection.
The File menu option is used to set the reference named selection. You can change the reference named selection only if no data objects exist in the database, which is directly after loading the reference mesh.
Nodes used for statistics/models: All field data objects of type node that are imported or created in oSP3D are defined when this option is selected.
Elements used for statistics/models or reference element set: All field data objects of type element are imported or created in oSP3D when this option is selected.
Fixed nodes for mesh morphing: Fixed nodes are not modified when oSP3D performs geometry variations. You should define the fixed nodes named selection from nodes not contained within the reference node or element named selection used for statistics and models.
Note: If you do not plan to modify geometries, you do not need to define fixed nodes.