4.8.1.13.2 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:

Figure 248 illustrates an instance diagram.

Reference Tessellation GeometryIfcProductIfcProductDefinitionShapeIfcShapeRepresentationIfcGeometricRepresentationContextIfcLabelIfcLabelIfcTriangulatedFaceSetTriangulated GeometryIfcPolygonalFaceSetPolygonal Geometry

Figure 248 — Reference Tessellation Geometry

mvdXML Specification
<?xml version="1.0" encoding="utf-8"?>
<ConceptTemplate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="c10a7cd4-27e6-465f-a76e-da460daed660" name="Reference Tessellation Geometry" applicableSchema="IFC4" applicableEntity="IfcProduct">
  <Rules>
    <AttributeRule AttributeName="Representation">
      <EntityRules>
        <EntityRule EntityName="IfcProductDefinitionShape">
          <AttributeRules>
            <AttributeRule AttributeName="Name" />
            <AttributeRule AttributeName="Description" />
            <AttributeRule AttributeName="Representations">
              <EntityRules>
                <EntityRule EntityName="IfcShapeRepresentation">
                  <AttributeRules>
                    <AttributeRule AttributeName="ContextOfItems">
                      <EntityRules>
                        <EntityRule EntityName="IfcGeometricRepresentationContext" />
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel">
                          <Constraints>
                            <Constraint Expression="Identifier[Value] = 'Reference'" />
                          </Constraints>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel">
                          <Constraints>
                            <Constraint Expression="Type[Value] = 'Tessellation'" />
                          </Constraints>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule AttributeName="Items">
                      <EntityRules>
                        <EntityRule EntityName="IfcTriangulatedFaceSet">
                          <References>
                            <Template ref="677bd4ce-e38b-4581-b40d-c9eaa2416971" />
                          </References>
                        </EntityRule>
                        <EntityRule EntityName="IfcPolygonalFaceSet">
                          <References>
                            <Template ref="72c0b316-6b48-478d-91fa-6e4b5a781b07" />
                          </References>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                  </AttributeRules>
                </EntityRule>
              </EntityRules>
            </AttributeRule>
          </AttributeRules>
        </EntityRule>
      </EntityRules>
    </AttributeRule>
  </Rules>
</ConceptTemplate>

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