Attaching entities to CAD Surfaces

FRED’s CAD import feature transfers geometry from STEP or IGES files in the form of parametric curves and surfaces. These curves and surfaces are based upon the NURBs representation common to all CAD software. During import, FRED makes no attempt to identify surface types and substitute native geometry. All CAD objects retain their original representation as NURBs.  As a result, imported objects all share a common coordinate system; namely the Global Coordinate System. The fact that there are no local coordinate systems associated with CAD geometry undermines the ability to “attach” Analysis Surfaces or position other entities at the location of a CAD object. The purpose of the article is to provide a method for properly locating and orienting an entity with respect to CAD geometry.

Referencing CAD Objects PDF

Download the FRED Script: UV_2_XYZ3.frs