IfcVertexLoop

注：定义根据ISO/CD 10303-42:1992

顶点环是由一个顶点构成的零亏格环。顶点可以独立于顶点循环而存在。拓扑数据应满足以下约束：

 

注：实体改编自ISO 10303-42中定义的顶点环。

IFC2x2中的历史新实体。

 

非正式提议： 

①顶点循环的范围和维数为零。

②顶点循环具有亏格0。

 

 

 

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	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.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcTopologicalRepresentationItem
IfcLoop
IfcVertexLoop
1	LoopVertex	IfcVertex	[1:1]	The vertex which defines the entire loop.	X

 

EXPRESS Specification

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