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8.8.3.38 IfcShellBasedSurfaceModel

8.8.3.38.1 Semantic definition

An IfcShellBasedSurfaceModel represents the shape by a set of open or closed shells. The connected faces within the shell have a dimensionality 2 and are placed in a coordinate space of dimensionality 3.

Informal Propositions

  1. The dimensionality of the shell based surface model is 2.
  2. The shells shall not overlap or intersect except at common faces, edges or vertices.

8.8.3.38.2 Entity inheritance

8.8.3.38.3 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
IfcShellBasedSurfaceModel (2)
1 SbsmBoundary SET [1:?] OF IfcShell

No description available.

* Dim IfcDimensionCount

This attribute is formally derived.

3

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

Table 8.8.3.38.A

8.8.3.38.4 Formal representation

ENTITY IfcShellBasedSurfaceModel
 SUBTYPE OF (IfcGeometricRepresentationItem);
	SbsmBoundary : SET [1:?] OF IfcShell;
 DERIVE
	 Dim : IfcDimensionCount := 3;
END_ENTITY;

8.8.3.38.5 References

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