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Question

Problem reading IFC files in FME Form 2026.1.1

  • May 29, 2026
  • 3 replies
  • 74 views
magnus
Contributor
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Hi

I recently upgraded FME Form from 2025.0 to 2026.1.1 and my workspace for processing IFC files no longer seems to work. So far, I have noticed these issues:

  • FME 2026 does not detect the same attributes, such as BIP.IfcGUID.NominalValue
  • I removed the reader and added it again and FME now seems to replace BIP.IfcGUID.NominalValue with BIP.IfcGUID.
  • The “Door” subset now seems to cointain thousands of attributes, which was not the case in FME 2025. This makes FME very slow to work with.
  • Saving the workspace now takes several minutes and the .fmw file has grown from around 0,9 MB to 21 MB.
  • Opening the workspace takes several minutes as well.

 

Has anyone else noticed these issues?

    3 replies

    magnus
    Contributor
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    • magnusContributor
    • Author
    • Contributor
    • May 29, 2026

    I shoud add that removing the “Door” item solves the issues with the massive file size and makes FME responsive again.

    crystalatsafe
    Safer
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    Hi ​@magnus 

    The IFC_API format underwent significant changes regarding property sets between versions 2025.0 and 2026.1.

    If you do not need 100% round-trip fidelity, you will likely see a performance improvement if you uncheck the parameters in the Read Defintions group.

     

    If possible, can you please share your workspace and some sample data with us? 

    magnus
    Contributor
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    • magnusContributor
    • Author
    • Contributor
    • June 5, 2026

    Hi

    Sorry, that doesn´t seem to help. I created a support request (65894) and got a reply from Dave. It sounded like this might be improved in a future release.

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