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Wall as an IfcElementAssembly or IfcMemeber as IfcAggregates of IfcWall

1. J by Johannes990 on 7 Nov 2022, edited 17 Nov 2022 #

   Hi All,

   I was looking for a similar topic within the communities, and I have not found a similar conversation; therefore, I am going to create a new discussion.

   I have modelled in Blender an "Internal Partitions - Timber Stud" with all the noggings, studs etc., and I don't know how to structure this information.

   Semantically I thought that a wall is an aggregate of different components, accordingly:

   I should create an instance of a wall and then use IfcAggregates to allocate the sub-member under the "IfcWall" so in ifcopenshell, I can use file.by_type("IfcWall") and retrive all the sub-components. However apparently is wrong because I am doubling the wall information and also, BlenderBIM doesn't allow me to do it (so I guess I am wrong :) )

   As a second option, I have decided to use the IfcElementAssembly however is not clear to me how to link the sub-components are part of a wall? (can I use file.by_type("IfcWall")?) let's pretend that someone what to retrive all the wall in my project and that there are modeled like an aggregate of studs/plasterboard/insulation etc. How can it do it?

   I am missing something... and I am going on a loop. Please help me. :)

2. B by brunopostle on 7 Nov 2022 # +2 votes

   You should be able to aggregate a collection of elements inside an IfcWall. I think that the wall must not have a representation, it needs to be an 'empty'

3. J by Johannes990 on 7 Nov 2022 # +1 votes

   Hi @brunopostle this actually work !!! thank you :)

   

4. A by Arv on 17 Nov 2022 #

   @brunopostle is the collection IfcWall/Empty automatically created by blenderbim or was that collection created and the empty IfcWall/Empty added to it.

5. B by brunopostle on 17 Nov 2022 #

   @Arv I can't check right now, but I think that you create an IFC element (a wall or whatever) using a blender 'empty' (normally you would use a blender mesh). You can then add other ifc elements to this in the outlined.

6. A by Arv on 17 Nov 2022 #

   @brunopostle said:

   @Arv I can't check right now, but I think that you create an IFC element (a wall or whatever) using a blender 'empty' (normally you would use a blender mesh). You can then add other ifc elements to this in the outlined.

   Had some confusion earlier on this with IfcRelAggregates, all good now :)

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