Negative 3D Geomsets (NGMSET) and Negative Primitives

A NGMSET is a grouping of negative 3D primitive elements which are used to represent holes or end preparations for structural items. It specifies the dimensions, orientation and obstruction geometry of each negative primitive. The attributes of NGMSETs are the same as those of their positive equivalents (see 3D Geomsets (GMSET) and 3D Geomset Primitives).

The Negative Geomset defines the symbol that is drawn for a particular Component by PARAGON (and Design) and also defines the obstruction geometry of the Component for use when checking for clashes.

Each symbol is built up from a combination of the following negative primitives:

• NSBO—negative rectangular box.

• NBOX—negative boxing.

• NSCO—negative cone.

• NLCY—negative cylinder.

• NSCY—negative cylinder.

• NSSL—negative slope bottomed cylinder.

• NLPY—negative pyramid.

• NSCT—negative circular torus.

• NSRT—negative rectangular torus.

• NLSN—negative snout.

• NSSP—negative sphere.

• NTUB—negative tubing.

• NSEX—negative user-defined extrusion.

• NSRE—negative solid of revolution.

• NSRU—negative ruled surface.

Negative Primitives have the same attributes as the corresponding positive primitives, with the addition of the NAPP (Negative APPlies to) attribute, which controls whether the negative primitive is removed from the item itself, or the attached or owning item. The allowed values are:

1—Default. See following table:

0—Negative Primitive will not be removed from anything.

1—Negative Primitive will be removed from Attached item.

2—Negative Primitive will be removed from Owner.

4—Negative Primitive will be removed from the item itself.

7—Negative Primitive will be removed from all items.

The positive values can be combined so that the hole will be created in more than one item. For example, NAPP=6 means that the volume will be removed from the item itself and the item’s owner.

The following table shows what Attached and Owner mean for items that can referenced NGMSEs.

For example, if a SUBJoint references a NGMSE which contains an NSBOX with NAPP=1, the NSBOX will be removed from the Subjoint’s attached Section.