IFC (IFC4X3_ADD1) development 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 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