4.8.1.14 Surface Geometry

Elements may have a 'Surface' representation describing the outer surface of the object. Such representation may be used for hit-testing objects having part composition such as framed walls, or for defining thermal boundaries idealized at the middle plane of an element.

The representation identifier of the surface representation is:

Figure 249 illustrates an instance diagram.

Surface GeometryIfcElementIfcProductDefinitionShapeIfcShapeRepresentationIfcGeometricRepresentationContextIfcLabelIfcLabel

Figure 249 — Surface 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="2e99de70-fb73-478f-9bca-4fedfdeb4ea5" name="Surface Geometry" applicableSchema="IFC4" applicableEntity="IfcElement">
  <Rules>
    <AttributeRule AttributeName="Representation">
      <EntityRules>
        <EntityRule EntityName="IfcProductDefinitionShape">
          <AttributeRules>
            <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] = 'Surface'" />
                          </Constraints>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel" />
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Items" AttributeName="Items" />
                  </AttributeRules>
                </EntityRule>
              </EntityRules>
            </AttributeRule>
            <AttributeRule AttributeName="Name" />
            <AttributeRule AttributeName="Description" />
          </AttributeRules>
        </EntityRule>
      </EntityRules>
    </AttributeRule>
  </Rules>
  <SubTemplates>
    <ConceptTemplate uuid="bd82983d-39d5-41b2-9ee8-f3bd8777d315" name="Surface 3D Geometry" applicableSchema="IFC4" applicableEntity="IfcElement">
      <Rules>
        <AttributeRule AttributeName="Representation">
          <EntityRules>
            <EntityRule EntityName="IfcProductDefinitionShape">
              <AttributeRules>
                <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] = 'Surface'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                          <EntityRules>
                            <EntityRule EntityName="IfcLabel">
                              <Constraints>
                                <Constraint Expression="Type[Value] = 'Surface3D'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Items" AttributeName="Items">
                          <EntityRules>
                            <EntityRule EntityName="IfcBoundedSurface" />
                            <EntityRule EntityName="IfcSweptSurface" />
                          </EntityRules>
                        </AttributeRule>
                      </AttributeRules>
                    </EntityRule>
                  </EntityRules>
                </AttributeRule>
                <AttributeRule AttributeName="Name" />
                <AttributeRule AttributeName="Description" />
              </AttributeRules>
            </EntityRule>
          </EntityRules>
        </AttributeRule>
      </Rules>
    </ConceptTemplate>
    <ConceptTemplate uuid="c62dfbec-49c6-41e3-836e-d494170ec2c8" name="Surface Sectioned Geometry" applicableSchema="IFC4" applicableEntity="IfcElement">
      <Rules>
        <AttributeRule AttributeName="Representation">
          <EntityRules>
            <EntityRule EntityName="IfcProductDefinitionShape">
              <AttributeRules>
                <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] = 'Surface'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                          <EntityRules>
                            <EntityRule EntityName="IfcLabel">
                              <Constraints>
                                <Constraint Expression="Type[Value] = 'SectionedSurface'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Items" AttributeName="Items">
                          <EntityRules>
                            <EntityRule EntityName="IfcSectionedSurface">
                              <AttributeRules>
                                <AttributeRule RuleID="Directrix" AttributeName="Directrix">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcBoundedCurve" />
                                  </EntityRules>
                                </AttributeRule>
                                <AttributeRule RuleID="CrossSections" AttributeName="CrossSections">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcProfileDef" />
                                  </EntityRules>
                                </AttributeRule>
                              </AttributeRules>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                      </AttributeRules>
                    </EntityRule>
                  </EntityRules>
                </AttributeRule>
                <AttributeRule AttributeName="Name" />
                <AttributeRule AttributeName="Description" />
              </AttributeRules>
            </EntityRule>
          </EntityRules>
        </AttributeRule>
      </Rules>
    </ConceptTemplate>
    <ConceptTemplate uuid="2a997000-9117-4764-8128-684dcb1d1286" name="Surface Tessellation Geometry" applicableSchema="IFC4" applicableEntity="IfcElement">
      <Rules>
        <AttributeRule AttributeName="Representation">
          <EntityRules>
            <EntityRule EntityName="IfcProductDefinitionShape">
              <AttributeRules>
                <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] = 'Surface'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                          <EntityRules>
                            <EntityRule EntityName="IfcLabel">
                              <Constraints>
                                <Constraint Expression="Type[Value] = 'Tessellation'" />
                              </Constraints>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                        <AttributeRule RuleID="Items" AttributeName="Items">
                          <EntityRules>
                            <EntityRule EntityName="IfcTriangulatedFaceSet">
                              <AttributeRules>
                                <AttributeRule AttributeName="Coordinates">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcCartesianPointList3D">
                                      <AttributeRules>
                                        <AttributeRule AttributeName="CoordList">
                                          <EntityRules>
                                            <EntityRule EntityName="IfcLengthMeasure" />
                                          </EntityRules>
                                        </AttributeRule>
                                      </AttributeRules>
                                    </EntityRule>
                                  </EntityRules>
                                </AttributeRule>
                                <AttributeRule AttributeName="Normals">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcParameterValue" />
                                  </EntityRules>
                                </AttributeRule>
                                <AttributeRule AttributeName="HasTextures" />
                                <AttributeRule AttributeName="LayerAssignment">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcPresentationLayerAssignment">
                                      <References>
                                        <Template ref="99ffb0d4-ada2-4b79-aa01-943fa3d834f1" />
                                      </References>
                                    </EntityRule>
                                  </EntityRules>
                                </AttributeRule>
                                <AttributeRule AttributeName="StyledByItem">
                                  <EntityRules>
                                    <EntityRule EntityName="IfcStyledItem">
                                      <AttributeRules>
                                        <AttributeRule AttributeName="Styles">
                                          <EntityRules>
                                            <EntityRule EntityName="IfcSurfaceStyle">
                                              <References>
                                                <Template ref="ea473562-c1e5-4dc7-ad75-ff3492576e36" />
                                              </References>
                                            </EntityRule>
                                          </EntityRules>
                                        </AttributeRule>
                                      </AttributeRules>
                                    </EntityRule>
                                  </EntityRules>
                                </AttributeRule>
                              </AttributeRules>
                            </EntityRule>
                          </EntityRules>
                        </AttributeRule>
                      </AttributeRules>
                    </EntityRule>
                  </EntityRules>
                </AttributeRule>
                <AttributeRule AttributeName="Name" />
                <AttributeRule AttributeName="Description" />
              </AttributeRules>
            </EntityRule>
          </EntityRules>
        </AttributeRule>
      </Rules>
    </ConceptTemplate>
  </SubTemplates>
</ConceptTemplate>

Link to this page  Link to this page