A Structural Geomset is a grouping of the 2D primitive elements which make up a Profile. Like the 3D Geomset, it specifies the dimensions, orientation and obstruction geometry of each primitive. It also defines the symbol that is drawn for a particular Component and the obstruction geometry of the Component. The Profile is built up from a combination of Structural Rectangles (SREC) and Structural Annuli (SANN), as described in Structural Geomsets (GMSSET). Structural Geomset elements and their attributes are listed in Structural Geomset Primitives.

To define the tube representation for the Profile shown in Figure 5:3.: Example of Parameterisation for a Universal Beam Profile, the commands shown below could be used. A simplified clash geometry for the Profile is specified by defining a bounding box for the Profile with ‘hard’ obstruction and giving the primitives of the Profile itself ’no obstruction’. The P-lines used are those defined in Example of Defining a Structural Pointset.

A P-line may be used to define an axis direction and position for a primitive. The example below shows how the upper flange could be positioned and orientated using a P-line. See Reference Section for details.