Revit 2023.1.1 classifications settings are not exported propperly

[EtiennevdBa]

Dear Revit/ifc team,

when i create a IFC file in Revit 2023.0.2 with the default exporter the classifications settings are exported propperly


when i export a IFC file in Revit 2023.0.2 with the opensource exporter 23.1.1.0 the classifications setting are not exported correctly

These issues are also in Revit 2023.1.1 with and without the opensource exporter.
are there more people with these issues?

Kind regards,

Étienne

[AngelVelezSosa]

I believe this is a known issue with Solibri that has already been fixed.

[EtiennevdBa]

I believe this is a known issue with Solibri that has already been fixed.

Dear AngelVelezSosa,

thanks for your response.
It's not Solibri related, when i open the IFC file in BIMvision i'm having the same issue.
Here is the same project in BIMvision with the classifications settings propperly exported:

Here it is not propperly exported:

Also tried the new 23.2.3.0 exporterd, same result:

Here are my classification settings within the IFC exporter:

what i don't understand is even with a filled in 'documentation location' there is other information in the IFC file.

If there is more information needed, please let me know.

[AngelVelezSosa]

I'll ask @WawanSolihin to check, but I think this might still be a viewer issue (#546, I think?)

[benjaminchvn]

Hi,

I am facing the same issue with classification, with Revit 2023.1 and IFC exporter 23.2.1.0.
Here are my classification settings :

I tested with a simple wall with "ClassificationCode" shared type parameter filled this way :

Here is the incorrect result with BIM Vision :

This is the same in Solibri :

It seems, as @EtiennevdBa noticed that IfcClassificationReference.Name and IfcClassificationReference.Location are not set up properly during export

[benjaminchvn]

Here is also the comparison of correct (with Revit 20) and incorrect export (with Revit 2023.1 and IFC exporter 23.2.1.0) with BIMCollab :

[louistrue]

@benjaminchvn @EtiennevdBa
Have a look here: #546
It's a mix of Revit doing something unusual and nearly all viewers having a bug where they dont read IfcClassification.Name but IfcRelAssociatesClassification.Name instead, which isn't the correct place to read the Classification Name from according to the IFC schema...

[WawanSolihin]

There seems to be a real regression bug also in Revit IFC exporter:

1. The classification reference name is not set correctly (It takes the classification name instead. "MyClassif" in the above example)
2. IfcClassificationReference.Location picks up the wrong value (from the default or previous value of Uniformat.
3. In IFC4 export it may not export the classification

I will log a defect on this issue.

[benjaminchvn]

Thanks ! Hope this can be fixed.
I was also wondering if there is any way to override the Defaut Classification (Uniformat) associated with the use of built-in Revit assembly code (Name, Source and Edition) :

So far the only way I have found is to manually edit the IFC in notepad....

[EtiennevdBa]

@benjaminchvn well, editing the IFC in notepad is quite fun.
I hope that there will be a fix soon :)