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#CV-2x3-138

agreement on providing a presentation layer for doors and windows based on parametric description
number
#CV-2x3-138
based on
IFC2x3
effects
extended coordination view
date
23. May 2007
initiator
ISG meeting Helsinki
summary agreement on providing a presentation layer for doors and windows based on parametric description

 

Description

Since the change from using the Pset_Draughting to using the IfcPresentationLayerAssignment - see also #CV-2x3-109 - standard, and  parametrically defined, IfcDoor and IfcWindow instances cannot hold the presentation layer information (as IfcPresentationLayerAssignment is assigned to IfcShapeRepresentation, and not to IfcElement (and subtypes).

To overcome the situation, each instance of IfcDoor and IfcWindow, that only have parametric representation, should also include an 'Profile' shape representation, as agreed in #CV-2x3-103. The 'Profile' shape representation would then be included in the set of AssignedItems of IfcPresentationLayerAssignment.