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BlenderBIM: Exporting out collection instances as mapped items

1. T by theoryshaw on 21 Feb 2021, edited 13 Mar 2022 #

   Is there a way to organize the BlenderBIM file such that collection instances are exported as mapped items in the IFC file?

   https://gitlab.com/osarch/FreeMVD_WorkFlow/-/blob/a5b2b0dc1472ee4ffb736d4d5ca2c587016f0eb0/Random%20Tests/Mapped_Items/Blender_Collection_Instances/Blender_Collection_Instances_01.blend

   

2. M by Moult on 21 Feb 2021 # +1 votes

   Unfortunately, no, that is not how mapped representations work in IFC. This would be better described as a "group" (in Revit terminology) more than IFC mapped representations. There is no support for it just yet in the BlenderBIM Add-on.

3. T by theoryshaw on 22 Feb 2021 #

   cool. Is there any convention in IFC for something like "mapped IfcGroups"?

4. M by Moult on 22 Feb 2021 #

   https://github.com/buildingSMART/NextGen-IFC/issues/61

5. T by theoryshaw on 9 Mar 2022, edited 9 Mar 2022 #

   Currently in BB, is there anyway to export out collection instances to IFC? I'm not looking to roundtrip collection instances (although would awesome) but only looking to make sure the resultant IFC file has the geometry inside the collection instances.

   Or would the only way to currently get them to export is to 'make instances real', and then 'copy class', before exporting?

6. G by Gorgious on 10 Mar 2022 #

   Turns out it's not really straightforward to accurately realize a collection instance. For example, if your base collection contains a disabled object, it won't be taken into account by the make_instances_real operator. Here's a discussion on BA and a script that's supposed to take care of the problems, but it seems it also has some shortcomings with boolean objects.

7. T by theoryshaw on 13 Mar 2022, edited 13 Mar 2022 #

   took a stab...https://github.com/buildingSMART/IFC4.3.x-development/issues/445

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