Data Model
Reference Manual
Design Database
:
Elements in Primitive Category
: Polyhedron Loop Element (POLOOP)
Polyhedron Loop Element (POLOOP)
Primitive Element
Description:
The POLOOP represents a planar profile which defines all or part of the shape of a Polyhedron Face (POLFAC). It is defined by a set of edges linking adjacent Point (POIN) elements, the latter being identified by references held in a Loop Points element (LOOPTS) owned by the POLOOP.
The order of the vertices (that is whether they are sequenced clockwise or anticlockwise) is significant. The order for a loop representing a positive polyhedron face is the opposite to that representing a negative polyhedron face. The LMIRR attribute determines whether the face points are read from start to end of the list, or in reverse. Reversing the order changes the loop from a positive outer boundary to a negative hole boundary, or vice versa. By default, points listed anticlockwise correspond to a positive boundary.
Attributes:
Name
Name of the element
Description
Description of the element
Function
Function
Purpose
Description code word
LMirror
True if Mirroring required
Orrf
Origin reference (for templates)
Legal Owners:
Polyhedron Face Element (POLFACE)
Legal Members:
Loop Points Element (LOOPTS)
The directions clockwise and anticlockwise refer to the sense when looking from outside of the face into the polyhedron.
1974 to current year.
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