IFC option "export links as separate models" causes wrong placement in Solibri
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Ok, so I need a real expert here I think, and I´ll try to be detailed.
I have a housing project, with 4 housetypes. Each type exists up to 30 times in the project, usually put together in rows af 6-8. Each type is modelled within it´s own Revit file. These 4 files does not contain a shared coordinate system, but has simply been modelled on top of a masterplan CAD file, showing the footprint of all house instances across all 4 types. This footprint file is a link (manual center), and has been placed in the same location, in each of the 4 type files, before any modeling took place. I randomly chose a "starting position" for each house type, within the allotted footprint types, meaning for example, that of the 30 footprints for house type A, I picked a random one, and modeled type A there. These 4 files were then linked (with origin2origin I believe), into an aggregate model, also containing the footprint file at the same location as the 4 type files. I used origin2origin here, because the original instance of the 4 typefiles would then be placed correctly within an allotted footprint, in the aggregate model. I then proceed to copy the 4 links onto all the footprints shown in the master CAD. Now, after having done this there were multiple changes to the placements of the links, meaning in a row of 6 type A houses, I might have deleted 5 of them, rotated and moved the last one to the new location (anywhere from 0,1 to 2 meters, and rotated maybe 1-2 degrees), and then copy it 5 more times to get the entire row of 6 in the new correct position.
Here is what´s happening to me, that I don´t understand. When I export the aggregated model to IFC using the "Export linked files as separate IFC" option, and then open all 60+ ifc files in Solibri model viever, all the links seems to be placed correct, except for the 4 originally placed instances of each house type. So, it seems that these 4 instances are somehow exported in an earlier position, than the rest.
Bonus info. The master CAD file contains the projects shared coordinates. I believe, that after copying the links, creating the first version of the aggregated model, I then acquired those coordinates (not in the 4 type files, only in the aggregated model). I then later proceeded to move/delete/copy the links again to their new position (I did not re-link the type files, only move/copy or delete them). In my own understanding of shared sites/coordinates this should not cause problems.
Can anyone explain what is happening here? I have attached an image of the aggregated IFC model to show how the original linked type A and B houses a placed wrong. The original linked type C and D are also displaced, but it´s not visible as they are not in rows. Also attached my IFC export settings.
Things I tried: unchecking "include IFC site", just because.
