IFC 4.3.0.1 (IFC4X3) development

4.8.1.1.1 Alignment Geometry Cant

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 tables below shows a recommended list of general usage patterns that users may adopt.

G IfcAlignment IfcAlignment 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:?]      ContainedInStructure [0:1]      Positions [0:?] 8. PredefinedType [0:1] IfcProductDefinitionShape IfcProductDefinitionShape 1. Name [0:1] 2. Description [0:1] 3. Representations [1:?]      ShapeOfProduct [1:?]      HasShapeAspects [0:?] IfcAlignment:Representation1->IfcProductDefinitionShape:IfcProductDefinitionShape0 IfcShapeRepresentation 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] IfcProductDefinitionShape:Representations1->IfcShapeRepresentation:IfcShapeRepresentation0 IfcGeometricRepresentationContext 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] IfcShapeRepresentation:ContextOfItems1->IfcGeometricRepresentationContext:IfcGeometricRepresentationContext0 IfcLabel_0 IfcLabel IfcShapeRepresentation:RepresentationIdentifier1->IfcLabel_0:IfcLabel0 IfcLabel_1 IfcLabel IfcShapeRepresentation:RepresentationType1->IfcLabel_1:IfcLabel0 IfcSegmentedReferenceCurve IfcSegmentedReferenceCurve      LayerAssignment [0:1]      StyledByItem [0:1] 1. Segments [1:?] 2. SelfIntersect [1:1] 3. BaseCurve [1:1] 4. EndPoint [0:1] IfcShapeRepresentation:Items1->IfcSegmentedReferenceCurve:IfcSegmentedReferenceCurve0 constraint_0 =Axis IfcLabel_0->constraint_0 constraint_1 =Curve3D IfcLabel_1->constraint_1 IfcGradientCurve IfcGradientCurve      LayerAssignment [0:1]      StyledByItem [0:1] 1. Segments [1:?] 2. SelfIntersect [1:1] 3. BaseCurve [1:1] 4. EndPoint [0:1] IfcSegmentedReferenceCurve:BaseCurve1->IfcGradientCurve:IfcGradientCurve0 IfcCurveSegment IfcCurveSegment      LayerAssignment [0:1]      StyledByItem [0:1] 1. Transition [1:1]      UsingCurves [1:?] 2. Placement [1:1] 3. SegmentStart [1:1] 4. SegmentLength [1:1] 5. ParentCurve [1:1] IfcSegmentedReferenceCurve:Segments1->IfcCurveSegment:IfcCurveSegment0 Gradient_Curve Gradient Curve IfcGradientCurve->Gradient_Curve Arc_Segment Arc Segment IfcCurveSegment->Arc_Segment Bloss_Transition_Segment Bloss Transition Segment IfcCurveSegment->Bloss_Transition_Segment Clothoid_Transition_Segment Clothoid Transition Segment IfcCurveSegment->Clothoid_Transition_Segment Cosine_Spiral_Transition_Segment Cosine Spiral Transition Segment IfcCurveSegment->Cosine_Spiral_Transition_Segment Helmert_Transition_Segment Helmert Transition Segment IfcCurveSegment->Helmert_Transition_Segment Linear_Segment Linear Segment IfcCurveSegment->Linear_Segment Sine_Spiral_Transition_Segment Sine Spiral Transition Segment IfcCurveSegment->Sine_Spiral_Transition_Segment Viennese_Bend_Transition_Segment Viennese Bend Transition Segment IfcCurveSegment->Viennese_Bend_Transition_Segment
Figure 4.8.1.1.1.A

General Usage

ApplicableEntity
IfcAlignment
Table 4.8.1.1.1.B

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