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[IFC] Is it possible to reference an IFC entity without geometry to two IFC entities with geometry..

1. M by Martin156131 on 23 Aug 2023, edited 23 Aug 2023 #

   Is it possible to reference an IFC entity without geometry to two IFC entities with geometry, even though all three IFC entities are in the same IfcSite?

   For example, I have two IfcBeam in IfcSite but also an IfcFastener WELD that connects both IfcBeam.

   IfcProject -> IfcSite -> 2x IfcBeam and IfcFastener WELD

   IfcBeam has a geometry, and therefore when I press IfcBeam in an IfcViwer, I get to the right element.

   IfcFastener WELD, on the other hand, does not have its own geometry, but when I go to IfcViewer IfcFastener WELD, I want to get to the two IfcBeam that connects IfcFastener WELD.

   Is there therefore in IFC an IfcRel... something to achieve this

2. A by Andrej730 on 23 Aug 2023, edited 23 Aug 2023 # +1 votes

   Sounds like IfcRelConnectsWithRealizingElements where beams are related/relating elements and IfcFastener is in RealizingElements.

   Not sure how it works in IfcViewer but basically from IfcFastener.IsConnectionRealization you can find the IfcRelConnectsWithRealizingElements and then you can find the connected elements.

3. M by Moult on 23 Aug 2023 # +3 votes

   Indeed that is the correct relationship I believe. Here is an example using mechanical fasteners:

   

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