In IFC it's possible for a property set to be assigned to multiple elements and which may lead to confusing behaviour when you edit a pset on one element and other element seems to get edited too.
Which makes it worse is that that it is possible that some software is might be doing this unintentionally when exporting IFC (as some sort of optimization as storing 1 is more optimal than n copies of it).
So now there are some tools in Bonsai and in IfcOpenShell to handle the shared psest:
1) Indication that property is shared - https://imgur.com/a/9dd3jST (similar to how Blender indicates ID data-block users). You can click on it to "unshare" the pset - a new copy for the pset will be created and it's going to be linked only to the active object.
2) api pset.unshare_pset method that does the same. And util.element.get_elements_using_pset method that encapsulates schema differences and different approaches for occurrences/types.
3) ifcpatch recipe 'UnsharePsets' that's making all property sets in the IFC file to have just 1 element that's using them. You can limit the affected elements by providing query.
ifcpatch recipe is also available in Bonsai - https://i.imgur.com/aOCx7HI.png
Kind of experimental. The idea is that it will reassign class e.g. from IfcWindow to IfcWindowType (or vice versa) and will keep the IFC representations and property sets.
Example - https://imgur.com/a/X7MHR0s
To avoid creating invalid material profile sets, representation items. Currently the only inverse that is allowed before removal is profile properties.
Example - https://i.imgur.com/UobI4pL.png
1) For psets there was an issue - it was instantiating abstract IfcProfileProperties
2) For materials it was only able to instantiate IfcExtendedMaterialProperties though there are other pset types too in ifc2x3.
It was failing on Windows with something like "ValueError: path is on mount 'L:', start on mount 'C:'".
I guess it doesn't really occur in bonsai as sheets are typically stored next to the titleblocks (we used to use absolute paths awhile ago and now everything is relative to the ifc project)
Andrej730
