IFC (IFC4X3_ADD2) under development IfcFacetedBrep

RV ⓘ
AbV ⓘ Semantic definition

The IfcFacetedBrep is a manifold solid brep with the restriction that all faces are planar and bounded polygons.

faceted brep instantiation
Figure — Diagram showing the use of IfcFacetedBrep

The faceted B-rep has been introduced in order to support the larger number of systems that allow boundary type solid representations with planar surfaces only.

Informal Propositions

  1. All the bounding loops of all the faces of all the shells in the IfcFacetedBrep shall be of type IfcPolyLoop.
  2. All vertices shall be referenced by all polyloops, sharing the vertex. I.e., each Cartesian point shall be references by at least three polyloops. 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.

IfcSolidModel (1)
* Dim IfcDimensionCount

This attribute is formally derived.


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

Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcManifoldSolidBrep (1)
1 Outer IfcClosedShell

A closed shell defining the exterior boundary of the solid. The shell normal shall point away from the interior of the solid.

Table Examples Formal representation

ENTITY IfcFacetedBrep
 SUBTYPE OF (IfcManifoldSolidBrep);
END_ENTITY; References

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