PR: IFC export from elements inside an Revit Assembly not displaying correctly

[xpt5]

Problem Description

Hi everyone.
I have assembled one instance of a Revit window and several door instances. The assembly itself is not exported to IFC, but the elements "living" inside the assembly are.
I noticed that the geometry in IFC is misplaced once I started doing some clash controls and these misplaced objects clashed with other objects.

Please take a look to the following image. On the right side in red are the IfcDoor elements and in green the IfcWindow object. It looks like the IfcWindow is mirrored when exported to IFC

Ifc exporter version 25.4.3.0

Revit Version

2025.4.x

IFC for Revit Addon Version

25.4.0

Windows Version

10 22H2

[ArtemHnatko]

Hi @xpt5,

Thank you for reporting this issue.

To investigate the incorrect IFC export of elements inside the assembly and identify the root cause, we will need access to a sample model where this behavior can be reproduced.

Could you please provide the Revit file (.RVT) that contains the assembly and the affected window/door instances? Even a reduced or simplified version of the model is perfectly fine, as long as the issue is still visible.

Thank you for your cooperation!

[xpt5]

Hi @ArtemHnatko,

I might be able to provide you with a sample next week as I am very busy meeting a deadline. Where can I send the file to?

[ArtemHnatko]

Hi @xpt5,

To proceed with the investigation, could you please upload a sample file to Autodesk Drive and share the download link here in this ticket?

Thank you!

[xpt5]

Hi @ArtemHnatko, I have the model ready to share but unfortunately I am not allowed to send the link via this ticket.
Could you please provide me with an email which I can use to allow access to the revit model via Autodesk Drive?

Thank you

[ArtemHnatko]

Hi @xpt5,

Please share the Autodesk Drive link with the following email address: artem.hnatko@autodesk.com
Once the invitation is sent, I will confirm as soon as I receive access.

Thanks again!

[xpt5]

I just shared the folder. The model can be used to investigate this issue and #914

Thanks for looking into this.

[ArtemHnatko]

Hi @xpt5 ,

Thank you for the update!
I can confirm that I have successfully received access to the shared file and downloaded it without any issues.

I’m now proceeding with reproducing the problem using your provided model.

Thanks again for your cooperation!

[ArtemHnatko]

This issue is also reported in Jira as "REVIT-245490" and is currently in the "Open" status.