IFC 4.3.x development

8.20.3.20 IfcVertexPoint

8.20.3.20.1 Semantic definitions at the entity

NOTE  Definition according to ISO/CD 10303-42:1992
A vertex point is a vertex which has its geometry defined as a point.

NOTE  Entity adapted from vertex_point defined in ISO 10303-42.

HISTORY  New entity in IFC2x.

Informal Propositions:

  1. The domain of the vertex is formally defined to be the domain of its vertex point.

8.20.3.20.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.

> IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.

> IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
StyledByItem SET [0:1] OF IfcStyledItem FOR Item Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.



> IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
IfcTopologicalRepresentationItem
IfcVertex
IfcVertexPoint
1 VertexGeometry IfcPoint The geometric point, which defines the position in geometric space of the vertex.

8.20.3.20.2 Entity inheritance

dot_inheritance IfcVertexPoint IfcVertexPoint IfcVertex IfcVertex IfcVertexPoint->IfcVertex IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem IfcVertex->IfcTopologicalRepresentationItem IfcTopologicalRepresentationItem_children 6 more... IfcTopologicalRepresentationItem_children->IfcTopologicalRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcTopologicalRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.20.3.20.3 Formal representations

ENTITY IfcVertexPoint
 SUBTYPE OF (IfcVertex);
	VertexGeometry : IfcPoint;
END_ENTITY;