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#CV-2x3-164

agreement on the correct use of shape representation types for elements and its features (openings, projections)
number
CV-2x3-164
based on
IFC2x3
effects
Coordination view version 2.0
date
September 2010
initiator
official buildingSMART certification 2.0 program
summary agreement on the correct use of shape representation types for elements and its features (openings, projections)

 

Description

 

For applying features to an element using the Boolean Difference implied by IfcRelVoidsElement, or the Boolean Union implied by IfcRelProjectsElement

it has to be ensured, that

  • both, the  relating element (subtype of IfcElement) and the related feature (IfcOpeningElement, or IfcProjectionElement), shall have a 'Body' shape representation
  • the 'Body' shape representation shall be a true solid, the use of 'SurfaceModel' geometry (e.g. IfcShallBasedSurfaceModel, or IfcFaceBasedSurfaceModel) is not allowed.