IfcVertex

Definition from ISO/CD 10303-42:1992: A vertex is the topological construct corresponding to a point. It has dimensionality 0 and extent 0. The domain of a vertex, if present, is a point in m dimensional real space RM; this is represented by the vertex point subtype.

> NOTE Corresponding STEP entity: vertex. Please refer to ISO/IS 10303-42:1994, p. 129 for the final definition of the formal standard.

> HISTORY New Entity in IFC Release 2.0

Informal proposition:

1. The vertex has dimensionality 0. This is a fundamental property of the vertex.
2. The extent of a vertex is defined to be zero.

EXPRESS specification:

ENTITY IfcVertex
SUPERTYPE OF | (IfcVertexPoint)
SUBTYPE OF ( | IfcTopologicalRepresentationItem);
END_ENTITY;

Inheritance graph

ENTITY IfcVertex;
ENTITY IfcRepresentationItem;
INVERSE
LayerAssignments | : | SET OF IfcPresentationLayerAssignment FOR AssignedItems;
StyledByItem | : | SET [0:1] OF IfcStyledItem FOR Item;
ENTITY IfcTopologicalRepresentationItem;
ENTITY IfcVertex;
END_ENTITY;