Hatching Rules

Each Hatching Rule references a Hatch Style element that defines the hatch pattern to be applied. For each Hatch Rule you can specify:

• Whether it applies to faces created by a section plane or to primitive surfaces.

• The orientation of the faces to be considered for hatching. There are three options:

  • All Directions, in which case the face will be hatched regardless of its orientation.

  • Perpendicular Direction, in which case the face will only be hatched if it is perpendicular to the viewing direction.

  • Specified Direction, in which case the face will only be hatched if its normal matches a specified value. The normal of a face is the vector perpendicular to it and pointing out of the solid primitive. Thus the normal of the uppermost horizontal surface of a box is Up.

The HRUL attributes, with their defaults, are as follows:

As well as the usual NEW command, an HRUL can also be defined by:

USE hstyl FOR criteria

which will set the HSTYF and CRIT attributes.