4.8.1.1 Alignment Geometry
Base for a standard two (Alignment Geometry Gradient) or three (Alignment Geometry Cant) level layout alignment geometric representation.
RepresentationIdentifier = 'Axis'
RepresentationType = Curve3D'
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
<a href="IfcAlignment.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcAlignment.htm">IfcAlignment</a>
IfcAlignment GlobalId
[1:1]
OwnerHistory
[0:1]
Name
[0:1]
Description
[0:1]
HasAssignments
[0:?]
Nests
[0:1]
IsNestedBy
[0:?]
HasContext
[0:1]
IsDecomposedBy
[0:?]
Decomposes
[0:1]
HasAssociations
[0:?]
ObjectType
[0:1]
IsDeclaredBy
[0:1]
Declares
[0:?]
IsTypedBy
[0:1]
IsDefinedBy
[0:?]
ObjectPlacement
[0:1]
Representation
[0:1]
ReferencedBy
[0:?]
PositionedRelativeTo
[0:?]
ReferencedInStructures
[0:?]
ContainedInStructure
[0:1]
Positions
[0:?]
PredefinedType
[0:1]
<a href="IfcProductDefinitionShape.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcProductDefinitionShape.htm">IfcProductDefinitionShape</a>
IfcProductDefinitionShape Name
[0:1]
Description
[0:1]
Representations
[1:?]
ShapeOfProduct
[1:?]
HasShapeAspects
[0:?]
<a href="IfcAlignment.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcAlignment.htm">IfcAlignment</a>:Representation1-><a href="IfcProductDefinitionShape.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcProductDefinitionShape.htm">IfcProductDefinitionShape</a>:IfcProductDefinitionShape0
<a href="IfcShapeRepresentation.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcShapeRepresentation.htm">IfcShapeRepresentation</a>
IfcShapeRepresentation ContextOfItems
[1:1]
Identifier
RepresentationIdentifier
[0:1]
Type
RepresentationType
[0:1]
Items
[1:?]
RepresentationMap
[0:1]
LayerAssignments
[0:?]
OfProductRepresentation
[0:?]
OfShapeAspect
[0:1]
<a href="IfcProductDefinitionShape.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcProductDefinitionShape.htm">IfcProductDefinitionShape</a>:Representations1-><a href="IfcShapeRepresentation.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcShapeRepresentation.htm">IfcShapeRepresentation</a>:IfcShapeRepresentation0
<a href="IfcGeometricRepresentationContext.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcGeometricRepresentationContext.htm">IfcGeometricRepresentationContext</a>
IfcGeometricRepresentationContext ContextIdentifier
[0:1]
ContextType
[0:1]
RepresentationsInContext
[0:?]
CoordinateSpaceDimension
[1:1]
Precision
[0:1]
WorldCoordinateSystem
[1:1]
TrueNorth
[0:1]
HasSubContexts
[0:?]
HasCoordinateOperation
[0:1]
<a href="IfcShapeRepresentation.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcShapeRepresentation.htm">IfcShapeRepresentation</a>:ContextOfItems1-><a href="IfcGeometricRepresentationContext.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcGeometricRepresentationContext.htm">IfcGeometricRepresentationContext</a>:IfcGeometricRepresentationContext0
IfcLabel_0
IfcLabel
<a href="IfcShapeRepresentation.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcShapeRepresentation.htm">IfcShapeRepresentation</a>:RepresentationIdentifier1->IfcLabel_0:IfcLabel0
IfcLabel_1
IfcLabel
<a href="IfcShapeRepresentation.htm" tppabs="https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/lexical/IfcShapeRepresentation.htm">IfcShapeRepresentation</a>:RepresentationType1->IfcLabel_1:IfcLabel0
constraint_0
=Axis
IfcLabel_0->constraint_0
constraint_1
=Curve3D
IfcLabel_1->constraint_1
Figure 4.8.1.1.A Table 4.8.1.1.B