8.20.3.19 IfcVertexLoop
8.20.3.19.1 Semantic definition
Definition according to 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: Entity adapted from vertex_loop defined in ISO 10303-42. New entity in IFC2x2.Informal Propositions
- A vertex loop has zero extent and dimensionality.
- The vertex loop has genus 0.
8.20.3.19.2 Entity inheritance
8.20.3.19.3 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. |
|
| Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes | |||
| IfcVertexLoop (1) | |||
| 1 | LoopVertex | IfcVertex |
The vertex which defines the entire loop. |
8.20.3.19.4 Formal representation
ENTITY IfcVertexLoop
SUBTYPE OF (IfcLoop);
LoopVertex : IfcVertex;
END_ENTITY;