Figure 77 — Surface Geometry
Elements may have a 'Surface' representation describing the outer surface of the object. Such representation may be used for hit-testing objects having part composition such as framed walls, or for defining thermal boundaries idealized at the middle plane of an element.
The representation identifier of the surface representation is:
Figure 77 illustrates an instance diagram.
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Figure 77 — Surface Geometry |
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<ConceptTemplate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="2e99de70-fb73-478f-9bca-4fedfdeb4ea5" name="Surface Geometry" status="sample" applicableSchema="IFC4" applicableEntity="IfcElement">
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<AttributeRule AttributeName="Representation">
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<AttributeRule AttributeName="ContextOfItems">
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<EntityRule EntityName="IfcGeometricRepresentationContext" />
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<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
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<EntityRule EntityName="IfcLabel">
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<AttributeRule Description="Value=Surface" AttributeName="Value=Surface" />
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<SubTemplates>
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<AttributeRule AttributeName="Representation">
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<EntityRule EntityName="IfcProductDefinitionShape">
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<AttributeRule AttributeName="ContextOfItems">
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<EntityRule EntityName="IfcGeometricRepresentationContext" />
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<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
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<EntityRule EntityName="IfcLabel">
<AttributeRules>
<AttributeRule Description="Value=Surface" AttributeName="Value=Surface" />
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<AttributeRule RuleID="Type" AttributeName="RepresentationType">
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<EntityRule EntityName="IfcLabel">
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<Constraint Expression="Type[Value] = 'Surface3D'" />
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<AttributeRule RuleID="Items" AttributeName="Items">
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<EntityRule EntityName="IfcBoundedSurface" />
<EntityRule EntityName="IfcSweptSurface" />
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