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20252453-T-424 项目

4.1.7.1.4.5 实体裁剪几何体(Body Clipping Geometry)

实体裁剪几何体(Body Clipping Geometry)是通过使用构造实体几何模型并仅涉及半空间实体的差集运算来表示产品的三维形状。

用于承载此几何表示的_IfcShapeRepresentation_的以下特性值应被使用:

下图展示了应用此概念时使用的通用类和关系。 此外,概念可能对常见或标准化的行业实践和场景具有特殊意义。对于这些特定的使用场景,下表展示了用户可采用的推荐通用使用模式列表。

<a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElement.htm'>IfcElement</a> IfcElement 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:?] 8. Tag [0:1]      FillsVoids [0:1]      ConnectedTo [0:?]      IsInterferedByElements [0:?]      InterferesElements [0:?]      HasProjections [0:?]      HasOpenings [0:?]      IsConnectionRealization [0:?]      ProvidesBoundaries [0:?]      ConnectedFrom [0:?]      ContainedInStructure [0:1]      HasCoverings [0:?]      HasSurfaceFeatures [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/IfcElement.htm'>IfcElement</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] Items 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 IfcBooleanClippingResult_0 IfcBooleanClippingResult      LayerAssignment [0:1]      StyledByItem [0:1] 1. Operator [1:1] 2. FirstOperand [1:1] 3. SecondOperand [1:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcShapeRepresentation.htm'>IfcShapeRepresentation</a>:Items1->IfcBooleanClippingResult_0:IfcBooleanClippingResult0 constraint_0 =Body IfcLabel_0->constraint_0 constraint_1 =Clipping IfcLabel_1->constraint_1 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcBooleanOperator.htm'>IfcBooleanOperator</a> IfcBooleanOperator IfcBooleanClippingResult_0:Operator1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcBooleanOperator.htm'>IfcBooleanOperator</a>:IfcBooleanOperator0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCsgPrimitive3D.htm'>IfcCsgPrimitive3D</a> IfcCsgPrimitive3D      LayerAssignment [0:1]      StyledByItem [0:1] 1. Position [1:1] IfcBooleanClippingResult_0:FirstOperand1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcCsgPrimitive3D.htm'>IfcCsgPrimitive3D</a>:IfcCsgPrimitive3D0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcSolidModel.htm'>IfcSolidModel</a> IfcSolidModel      LayerAssignment [0:1]      StyledByItem [0:1] IfcBooleanClippingResult_0:FirstOperand1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcSolidModel.htm'>IfcSolidModel</a>:IfcSolidModel0 IfcBooleanClippingResult_1 IfcBooleanClippingResult      LayerAssignment [0:1]      StyledByItem [0:1] 1. Operator [1:1] 2. FirstOperand [1:1] 3. SecondOperand [1:1] IfcBooleanClippingResult_0:FirstOperand1->IfcBooleanClippingResult_1:IfcBooleanClippingResult0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcHalfSpaceSolid.htm'>IfcHalfSpaceSolid</a> IfcHalfSpaceSolid      LayerAssignment [0:1]      StyledByItem [0:1] 1. BaseSurface [1:1] 2. AgreementFlag [1:1] IfcBooleanClippingResult_0:SecondOperand1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcHalfSpaceSolid.htm'>IfcHalfSpaceSolid</a>:IfcHalfSpaceSolid0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a> IfcPolygonalBoundedHalfSpace      LayerAssignment [0:1]      StyledByItem [0:1] 1. BaseSurface [1:1] 2. AgreementFlag [1:1] 3. Position [1:1] 4. PolygonalBoundary [1:1] IfcBooleanClippingResult_0:SecondOperand1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a>:IfcPolygonalBoundedHalfSpace0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPlane.htm'>IfcPlane</a> IfcPlane      LayerAssignment [0:1]      StyledByItem [0:1] 1. Position [1:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a>:BaseSurface1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPlane.htm'>IfcPlane</a>:IfcPlane0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcBoolean.htm'>IfcBoolean</a> IfcBoolean <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a>:AgreementFlag1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcBoolean.htm'>IfcBoolean</a>:IfcBoolean0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a> IfcAxis2Placement3D      LayerAssignment [0:1]      StyledByItem [0:1] 1. Location [1:1] 2. Axis [0:1] 3. RefDirection [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a>:Position1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcAxis2Placement3D.htm'>IfcAxis2Placement3D</a>:IfcAxis2Placement3D0 <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcIndexedPolyCurve.htm'>IfcIndexedPolyCurve</a> IfcIndexedPolyCurve      LayerAssignment [0:1]      StyledByItem [0:1] 1. Points [1:1] 2. Segments [1:?] 3. SelfIntersect [0:1] <a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcPolygonalBoundedHalfSpace.htm'>IfcPolygonalBoundedHalfSpace</a>:PolygonalBoundary1-><a href='/IFC/RELEASE/IFC4x3/HTML/lexical/IfcIndexedPolyCurve.htm'>IfcIndexedPolyCurve</a>:IfcIndexedPolyCurve0
Figure 4.1.7.1.4.5.A

General Usage

ApplicableEntity
IfcElement
表 4.1.7.1.4.5.B