8.8.3.23 IfcIndexedPolygonalFace

8.8.3.23.1 Semantic definition

The IfcIndexedPolygonalFace is a compact representation of a planar face being part of a face set. The vertices of the polygonal planar face are provided by 3 or more Cartesian points, defined by indices that point into an IfcCartesianPointList3D, either direcly, or via the PnIndex, if provided at IfcPolygonalFaceSet.

Figure 8.8.3.23.A shows an IfcIndexedPolygonalFace at an IfcPolygonalFaceSet not using PnIndex (the default).

Figure 8.8.3.23.B shows an IfcIndexedPolygonalFace at an IfcPolygonalFaceSet using PnIndex.

8.8.3.23.2 Entity inheritance

1. • IfcRepresentationItem
2. • IfcGeometricRepresentationItem
   • IfcMappedItem
   • IfcStyledItem
   • IfcTopologicalRepresentationItem
3. • IfcTessellatedItem
   • IfcAnnotationFillArea
   • IfcBooleanResult
   • IfcBoundingBox
   • IfcCartesianPointList
   • IfcCartesianTransformationOperator
   • IfcCsgPrimitive3D
   • IfcCurve
   • IfcDirection
   • IfcFaceBasedSurfaceModel
   • IfcFillAreaStyleHatching
   • IfcFillAreaStyleTiles
   • IfcGeometricSet
   • IfcHalfSpaceSolid
   • IfcLightSource
   • IfcPlacement
   • IfcPlanarExtent
   • IfcPoint
   • IfcSectionedSpine
   • IfcSegment
   • IfcShellBasedSurfaceModel
   • IfcSolidModel
   • IfcSurface
   • IfcTextLiteral
   • IfcVector
4. • IfcIndexedPolygonalFace
   • IfcTessellatedFaceSet
5. • IfcIndexedPolygonalFaceWithVoids

8.8.3.23.3 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
IfcIndexedPolygonalFace (3)
1	CoordIndex	LIST [3:?] OF IfcPositiveInteger	One-dimensional list with the indices for the three or more points, that define the vertices of the outer loop. If the tessellated face set is closed, indicated by SELF\IfcTessellatedFaceSet.Closed, then the points, defining the outer loop, shall connect counter clockwise, as seen from the outside of the body, so that the resulting normal will point outwards.
	ToFaceSet	SET [1:?] OF IfcPolygonalFaceSet FOR Faces	Reference to the IfcPolygonalFaceSet for which this face is associated.
	HasTexCoords	SET [0:1] OF IfcTextureCoordinateIndices FOR TexCoordsOf	Optional reference to the IfcTextureCoordinateIndices that provide the texture coordinates for applying textures to this face.

8.8.3.23.4 Formal representation

ENTITY IfcIndexedPolygonalFace
 SUPERTYPE OF (ONEOF
	(IfcIndexedPolygonalFaceWithVoids))
 SUBTYPE OF (IfcTessellatedItem);
	CoordIndex : LIST [3:?] OF IfcPositiveInteger;
 INVERSE
	ToFaceSet : SET [1:?] OF IfcPolygonalFaceSet FOR Faces;
	HasTexCoords : SET [0:1] OF IfcTextureCoordinateIndices FOR TexCoordsOf;
END_ENTITY;

8.8.3.23.5 References

• IfcIndexedPolygonalFaceWithVoids
• IfcPolygonalFaceSet
• IfcTessellatedItem
• IfcTextureCoordinateIndices