8.20.3.18 IfcVertex
AbV ⓘ
8.20.3.18.1 Semantic definition
Definition according to 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 R^M^; this is represented by the vertex point subtype. Entity adapted from vertex defined in ISO 10303-42. New entity in IFC2.0Informal Propositions
- The vertex has dimensionality 0. This is a fundamental property of the vertex.
- The extent of a vertex is defined to be zero.
8.20.3.18.2 Entity inheritance
8.20.3.18.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcRepresentationItem (2) | |||
| LayerAssignment | SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems |
Assignment 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. The inverse attribute LayerAssignments has been added. 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. The inverse attribute StyledByItem has been added. |
|
8.20.3.18.4 Formal representation
ENTITY IfcVertex
SUPERTYPE OF (ONEOF
(IfcVertexPoint))
SUBTYPE OF (IfcTopologicalRepresentationItem);
END_ENTITY;