IFC (IFC4X3_ADD2) official IfcFaceBasedSurfaceModel Semantic definition

The IfcFaceBasedSurfaceModel represents the a shape by connected face sets. The connected faces have a dimensionality 2 and are placed in a coordinate space of dimensionality 3.

Informal Propositions

  1. The connected face sets shall not overlap or intersect except at common faces, edges or vertices.
  2. The fbsm faces have dimensionality 2. 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.

Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcFaceBasedSurfaceModel (2)
1 FbsmFaces SET [1:?] OF IfcConnectedFaceSet

The set of connected face sets comprising the face based surface model.

* Dim IfcDimensionCount

This attribute is formally derived.


The space dimensionality of this class, it is always 3.

Table Examples Formal representation

ENTITY IfcFaceBasedSurfaceModel
 SUBTYPE OF (IfcGeometricRepresentationItem);
	FbsmFaces : SET [1:?] OF IfcConnectedFaceSet;
	 Dim : IfcDimensionCount := 3;
END_ENTITY; References

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Is this page difficult to understand? Let us know! Changelog IFC4

  • deprecated, Is now deprecated IFC4.2

  • deprecated, Is no longer deprecated