IfcAnnotationSurfaceOccurrence
Definition
from IAI: The IfcAnnotationSurfaceOccurrence
shall only be used within a material or paper space
dependent representation (note: paper space is not yet supported within
this IFC release). Styled surfaces or solids within model
space shall use IfcStyledItem as the instance to
link the geometric surface, solid or annotation surface (for texture
maps) representation item to the (shared) style information.
An IfcAnnotationSurfaceOccurrence
is a relation object, that assigns a (set of) styles to a
representation item. It can be used without having a geometric
representation item already assigned, e.g. within an IfcMaterialDefinitionRepresentation.
Each instance of IfcAnnotationSurfaceOccurrence points,
via an IfcPresentationStyleAssignment, to an IfcSurfaceStyle,
that can be shared by many styled surfaces, or solids.
NOTE
No direct
corresponding STEP
entity, the entity has been defined in analogy to the other annotation
occurrence entity.
HISTORY
New entity in
Release IFC2x Edition 2.
EXPRESS specification:
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| ENTITY IfcAnnotationSurfaceOccurrence
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| WR31
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NOT(EXISTS(SELF\IfcStyledItem.Item)) OR
(SIZEOF(
['IFCGEOMETRYRESOURCE.IFCSURFACE',
'IFCGEOMETRICMODELRESOURCE.IFCFACEBASEDSURFACEMODEL',
'IFCGEOMETRICMODELRESOURCE.IFCSHELLBASEDSURFACEMODEL',
'IFCGEOMETRICMODELRESOURCE.IFCSOLIDMODEL'] *
TYPEOF(SELF\IfcStyledItem.Item)) > 0);
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Formal Propositions:
| WR31
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The Item that is styled by an IfcAnnotationSurfaceOccurrence relation shall be (if provided) a subtype of IfcSurface, IfcSolidModel, IfcShellBasedSurfaceModel, IfcFaceBasedSurfaceModel.
NOTE If no Item is provided, the IfcAnnotationSurfaceOccurrence is used to provide a surface style to a material dependent presentation.
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Inheritance graph
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| ENTITY IfcAnnotationSurfaceOccurrence;
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