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IfcVertexLoop

Definition from ISO/CD 10303-42:1992: A vertex_loop is a loop of zero genus consisting of a single vertex. A vertex can exist independently of a vertex loop. The topological data shall satisfy the following constraint:

Equation shall be satisfied

Informal propositions:

  1. A vertex loop has zero extent and dimensionality.
  2. The vertex loop has genus 0.

NOTE: Corresponding STEP entity: vertex_loop. Please refer to ISO/IS 10303-42:1994, p. 121 for the final definition of the formal standard.

HISTORY: New Entity in Release IFC 2x Edition 2.

EXPRESS specification:

ENTITY IfcVertexLoop
SUBTYPE OF ( IfcLoop);
LoopVertex  :  IfcVertex;
END_ENTITY;

Attribute definitions:

LoopVertex  :  The vertex which defines the entire loop.

Inheritance graph

ENTITY IfcVertexLoop;
ENTITY IfcRepresentationItem;
ENTITY IfcTopologicalRepresentationItem;
ENTITY IfcLoop;
ENTITY IfcVertexLoop;
LoopVertex  :  IfcVertex;
END_ENTITY;