ABSTRACT This definition may not be instantiated
220.127.116.11.1 Semantic definition
An IfcSurface is a 2-dimensional representation item positioned in 3-dimensional space. 2-dimensional means that each point at the surface can be defined by a 2-dimensional coordinate system, usually by u and v coordinates.
- A surface has non zero area.
- A surface is arcwise connected.
18.104.22.168.2 Entity inheritance
|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.
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This attribute is formally derived.
The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.
22.214.171.124.4 Formal representation
ENTITY IfcSurface ABSTRACT SUPERTYPE OF (ONEOF (IfcBoundedSurface ,IfcElementarySurface ,IfcSectionedSurface ,IfcSweptSurface)) SUBTYPE OF (IfcGeometricRepresentationItem); DERIVE Dim : IfcDimensionCount := 3; END_ENTITY;