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4.1.7.1.12.2 Reference Tessellation Geometry

The Reference Tessellation Geometry is the reference representation of the 3D shape of a product by using tessellated models. Being a reference representation it is normally not displayed and it is not used in a voiding relationship.

The following attribute values for the IfcShapeRepresentation holding this geometric representation shall be used:

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.

G <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProduct.htm'>IfcProduct</a> IfcProduct 1. GlobalId [1:1] 2. OwnerHistory [0:1] 3. Name [0:1] 4. Description [0:1]      HasAssignments [0:?]      Nests [0:1]      IsNestedBy [0:?]      HasContext [0:1]      IsDecomposedBy [0:?]      Decomposes [0:1]      HasAssociations [0:?] 5. ObjectType [0:1]      IsDeclaredBy [0:1]      Declares [0:?]      IsTypedBy [0:1]      IsDefinedBy [0:?] 6. ObjectPlacement [0:1] 7. Representation [0:1]      ReferencedBy [0:?]      PositionedRelativeTo [0:?]      ReferencedInStructures [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a> IfcProductDefinitionShape 1. Name [0:1] 2. Description [0:1] 3. Representations [1:?]      ShapeOfProduct [1:?]      HasShapeAspects [0:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProduct.htm'>IfcProduct</a>:Representation1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a>:IfcProductDefinitionShape0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a> IfcShapeRepresentation 1. ContextOfItems [1:1] Identifier 2. RepresentationIdentifier [0:1] Type 3. RepresentationType [0:1] 4. Items [1:?]      RepresentationMap [0:1]      LayerAssignments [0:?]      OfProductRepresentation [0:?]      OfShapeAspect [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcProductDefinitionShape.htm'>IfcProductDefinitionShape</a>:Representations1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:IfcShapeRepresentation0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a> IfcGeometricRepresentationContext 1. ContextIdentifier [0:1] 2. ContextType [0:1]      RepresentationsInContext [0:?] 3. CoordinateSpaceDimension [1:1] 4. Precision [0:1] 5. WorldCoordinateSystem [1:1] 6. TrueNorth [0:1]      HasSubContexts [0:?]      HasCoordinateOperation [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:ContextOfItems1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcGeometricRepresentationContext.htm'>IfcGeometricRepresentationContext</a>:IfcGeometricRepresentationContext0 IfcLabel_0 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:RepresentationIdentifier1->IfcLabel_0:IfcLabel0 IfcLabel_1 IfcLabel <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:RepresentationType1->IfcLabel_1:IfcLabel0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTriangulatedFaceSet.htm'>IfcTriangulatedFaceSet</a> IfcTriangulatedFaceSet      LayerAssignment [0:1]      StyledByItem [0:1] 1. Coordinates [1:1]      HasColours [0:1]      HasTextures [0:?] 2. Normals [1:?] 3. Closed [0:1] 4. CoordIndex [1:?] 5. PnIndex [1:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:Items1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTriangulatedFaceSet.htm'>IfcTriangulatedFaceSet</a>:IfcTriangulatedFaceSet0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalFaceSet.htm'>IfcPolygonalFaceSet</a> IfcPolygonalFaceSet      LayerAssignment [0:1]      StyledByItem [0:1] 1. Coordinates [1:1]      HasColours [0:1]      HasTextures [0:?] 2. Closed [0:1] 3. Faces [1:?] 4. PnIndex [1:?] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:Items1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalFaceSet.htm'>IfcPolygonalFaceSet</a>:IfcPolygonalFaceSet0 constraint_0 =Reference IfcLabel_0->constraint_0 constraint_1 =Tessellation IfcLabel_1->constraint_1 Triangulated_Geometry Triangulated Geometry <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTriangulatedFaceSet.htm'>IfcTriangulatedFaceSet</a>->Triangulated_Geometry Polygonal_Geometry Polygonal Geometry <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalFaceSet.htm'>IfcPolygonalFaceSet</a>->Polygonal_Geometry
Figure 4.1.7.1.12.2.A

General Usage

ApplicableEntity
IfcProduct
Table 4.1.7.1.12.2.B

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