4.1.8.1.3 Type Clearance Geometry
For elements that require clearance such as for safety, maintenance, or other purpose, this represents the 3D clearance volume of the item having RepresentationType of 'Surface3D'. Such clearance region indicates space that should not intersect with the 'Body' representation of other elements, though may intersect with the 'Clearance' representation of other elements.
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 table below shows a recommended list of general usage patterns that users may adopt.
G
IfcDistributionElementType
IfcDistributionElementType
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. ApplicableOccurrence
[0:1]
6. HasPropertySets
[1:?]
Types
[0:1]
7. RepresentationMaps
[1:?]
8. Tag
[0:1]
ReferencedBy
[0:?]
9. ElementType
[0:1]
IfcRepresentationMap
IfcRepresentationMap
1. MappingOrigin
[1:1]
2. MappedRepresentation
[1:1]
HasShapeAspects
[0:?]
MapUsage
[0:?]
IfcDistributionElementType :RepresentationMaps1->IfcRepresentationMap :IfcRepresentationMap0
IfcShapeRepresentation
IfcShapeRepresentation
1. ContextOfItems
[1:1]
2. RepresentationIdentifier
[0:1]
Type
3. RepresentationType
[0:1]
Geometry
4. Items
[1:?]
RepresentationMap
[0:1]
LayerAssignments
[0:?]
OfProductRepresentation
[0:?]
OfShapeAspect
[0:1]
IfcRepresentationMap :MappedRepresentation1->IfcShapeRepresentation :IfcShapeRepresentation0
IfcAxis2Placement3D
IfcAxis2Placement3D
LayerAssignment
[0:1]
StyledByItem
[0:1]
1. Location
[1:1]
2. Axis
[0:1]
3. RefDirection
[0:1]
IfcRepresentationMap :MappingOrigin1->IfcAxis2Placement3D :IfcAxis2Placement3D0
IfcAxis2Placement2D
IfcAxis2Placement2D
LayerAssignment
[0:1]
StyledByItem
[0:1]
1. Location
[1:1]
2. RefDirection
[0:1]
IfcRepresentationMap :MappingOrigin1->IfcAxis2Placement2D :IfcAxis2Placement2D0
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
IfcBoundedSurface
IfcBoundedSurface
LayerAssignment
[0:1]
StyledByItem
[0:1]
IfcShapeRepresentation :Items1->IfcBoundedSurface :IfcBoundedSurface0
Figure 4.1.8.1.3.A
General UsageTable 4.1.8.1.3.B