PR: Displacement of elements

[WillemdBr]

Door Elements from an assembly are displaced when exported to IFC

Hi,

See images below, when exporting this Door family to IFC, elements are displaced in different IFC viewers.

Revit:

Solibri:

BIMcollab ZOOM:

BSJ-B-BWK-B-R24.zip

See attached file.

Revit Version

2024.3.0

IFC for Revit Addon Version

24.3.0

Windows Version

11 22H2

[o-babii]

Hello @WillemdBr ,

Can you please provide more details about your case?
If it's possible for you, could you please provide the Revit file for which the issue is reproduced,
it will help in investigating the issue.

Regards

[WillemdBr]

@o-babii Sorry for the late reaction, I missed your Reply

Attached you can find a Revit file with the Exported IFC where you can see that the window elements within the assembly are displaced.
From other (sub)contractors I hear the same issue they're all having. For example a prefabricated concrete wall with DEMU's or gains in them where some of them are displaced:

Is there an estimated timeline where this issue is fixed?

https://we.tl/t-svCpHGMavP

[sjspikings]

We are also experiencing this issue with assemblies when modelling precast concrete.

Our recent project was in Revit 2023 and we found that if we downgraded the IFC exporter to version 2023.1.0.0 we no longer experienced the displacement problem. We will soon be using Revit 2024 for a project and have found that the issue still exists when using the 2.2.0 exporter and also the 25.4.0 exporter for Revit 2025.

We would really appreciate a fix for this.

[sjspikings]

As a followup to the above, I've noticed that having a reference plane set to Defines Origin that is not aligned to the Ref. Level, causes geometry to be displace from the assembly export by the same distance that between the Defines Origin reference plane and the Ref. level.

In the example above, the solid geometry in the family was displaced 500mm upwards from the nested shared fittings families that exported in the correct location. Changing the reference plane that defined the origin fixed the problem. All were wrapped in an assembly.

This was in Revit 2024 using the 24.2.20.35 IFC exporter.

[WillemdBr]

@o-babii @WawanSolihin @AngelVelezSosa
Is there an update on this issue? This is a big issue for a lot of company's that are working with assemblies!
Think of assembled steel structures/ concrete walls with rebar/ etc..

Hope to hear from you!

[o-babii]

Hello @WillemdBr, could you please send me a Revit file to reproduce the issue via email ([email protected])? I’ll check if it’s resolved and prioritize the task if it’s not. The .zip archive contains only the IFC file, and the WeTransfer link doesn’t work, at least for me.