Hatching Rules

DRAW Reference Manual

Graphical Representation : Automatic Hatching : 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:

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

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

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All Directions, in which case the face is hatched regardless of its orientation.

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

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Specified Direction, in which case the face is only 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:


Hatch Style Ref	HSTYF	reference to HSTYL, default null
Face Code	FCODE	Sectioned-Faces
Direction Code	DCODE	All-Directions
Face Normal	NORM	unset
Selection Criteria	CRIT	unset


Example:
HSTYF /HSTYL1 FCODE SECTionedfaces FCODE PRIMitivefaces DCODE ALL Directions DCODE PERPendiculardirection DCODE SPECifieddirection NORM standard AVEVA direction syntax CRIT standard AVEVA selection criteria syntax

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

USE hstyl FOR criteria

which sets the HSTYF and CRIT attributes.

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