About AEC Geometric Entities (IFC 4)

The following table lists the IFC 4 geometric entities supported by the Converter for IFC, either at import or/and export. These elements are sub-classes of IfcGeometricRepresentationItem.

IFC Entity Supported at Import Supported at Export
IfcAdvancedBrep yes yes
IfcAdvancedBrepWithVoids yes yes
IfcAdvancedFace yes yes
IfcBSplineCurveWithKnots yes yes
IfcBSplineSurfaceWithKnots yes yes
IfcCartesianPointList3D yes yes
IfcIndexedPolycurve yes no
IfcPolygonalFaceSet yes no
IfcRationalBSplineCurveWithKnots yes yes
IfcRationalBSplineSurfaceWithKnots yes yes
IfcTriangulatedFaceSet yes yes
IfcExtrudedAreaSolid yes yes
Note: Pads are exported as IfcExtrudedAreaSolid, except for the following cases where they are exported as IfcAdvancedBrep:
  • Pads created with First Limit or Second Limit specified as Up to next or Up to last.
  • Pads created with Up to plane, where the plane is not perpendicular to the extrusion direction.
  • Pads created with Up to surface, where the surface is not perpendicular to the extrusion direction.
  • Pad created with Up to surface, where the surface is not planar.

The following table lists the IFC 4 miscellaneous entities supported by the Converter for IFC, either at import or/and export.

IFC Entity Supported at Import Supported at Export
IfcQuantitySet yes yes