4.8.1.3.4 Body Clipping Geometry

The Body Clipping Geometry is the representation of the 3D shape of a product by using Constructive Solid Geometry models with difference operations involving half space solids only.

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

NOTE  This representation type is predominately used for compatibility with previous releases of the standard.

Figure 92 illustrates an instance diagram.

Body Clipping GeometryIfcElementIfcProductDefinitionShapeIfcShapeRepresentationIfcGeometricRepresentationContextIfcLabelIfcLabelIfcBooleanClippingResultIfcBooleanOperatorIfcCsgPrimitive3DIfcSolidModelIfcBooleanClippingResultIfcHalfSpaceSolidIfcPolygonalBoundedHalfSpaceIfcPlaneIfcBooleanIfcAxis2Placement3DIfcIndexedPolyCurve

Figure 92 — Body Clipping Geometry

mvdXML Specification
<?xml version="1.0"?>
<ConceptTemplate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="2cdbc2f5-9b0c-43ea-9d2a-9d72d0147e00" name="Body Clipping 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" />
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel">
                          <Constraints>
                            <Constraint Expression="Type[Value] = 'Clipping'" />
                          </Constraints>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Items" AttributeName="Items">
                      <EntityRules>
                        <EntityRule EntityName="IfcBooleanClippingResult">
                          <AttributeRules>
                            <AttributeRule AttributeName="Operator">
                              <EntityRules>
                                <EntityRule EntityName="IfcBooleanOperator" />
                              </EntityRules>
                            </AttributeRule>
                            <AttributeRule AttributeName="FirstOperand">
                              <EntityRules>
                                <EntityRule EntityName="IfcCsgPrimitive3D" />
                                <EntityRule EntityName="IfcSolidModel" />
                                <EntityRule EntityName="IfcBooleanClippingResult" />
                              </EntityRules>
                            </AttributeRule>
                            <AttributeRule AttributeName="SecondOperand">
                              <EntityRules>
                                <EntityRule EntityName="IfcHalfSpaceSolid" />
                                <EntityRule EntityName="IfcPolygonalBoundedHalfSpace">
                                  <AttributeRules>
                                    <AttributeRule AttributeName="BaseSurface">
                                      <EntityRules>
                                        <EntityRule EntityName="IfcPlane" />
                                      </EntityRules>
                                    </AttributeRule>
                                    <AttributeRule AttributeName="AgreementFlag">
                                      <EntityRules>
                                        <EntityRule EntityName="IfcBoolean" />
                                      </EntityRules>
                                    </AttributeRule>
                                    <AttributeRule AttributeName="Position">
                                      <EntityRules>
                                        <EntityRule EntityName="IfcAxis2Placement3D" />
                                      </EntityRules>
                                    </AttributeRule>
                                    <AttributeRule AttributeName="PolygonalBoundary">
                                      <EntityRules>
                                        <EntityRule EntityName="IfcIndexedPolyCurve" />
                                      </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>

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