IFC (IFC4X3_TC1) IfcLoop Semantic definition

Image where V and E~l~ are the number of unique vertices and oriented edges in the loop and G^l^ is the genus of the loop.

Informal Propositions:

  1. A loop has a finite extent.
  2. A loop describes a closed (topological) curve with coincident start and end vertices. Entity inheritance 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.

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.

Table Formal representation

 SUBTYPE OF (IfcTopologicalRepresentationItem);
END_ENTITY; References