problems displaying a BIM model

[ValentinQGIS]

What is the bug or the crash?

We are trying to display a BIM model that we have created in Autodesk Revit in QGIS and have converted the Revit file into an ODC CityGML using the FME Quicktranslator. We then imported this into QGIS, but the building was not displayed as a 3D model but as a square in the plane.

We also tried to visualize the building model with the Cesium ION plugin in QGIS. However, this did not work either. The building was displayed perfectly in Cesium ION, but nothing appeared in QGIS except an error message.
Error message when importing from Cesium to QGIS:

Steps to reproduce the issue

Aleitung ohne Cesium:
Revit-Datei mit dem FME Quicktranslator in eine OGC CityGML umwandeln
via Drag and Drop in QGIS importieren

Instructions for Cesium:
Upload BIM model to Cesium ion
Select tileset location
Import the model with the QQIS plugin using the AssetID and the asset token

Versions

Qgis Version 3.34

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

Our goal is to import a BIM model created with Autodesk Revit into QGIS. This means we want to import a LOD5 model into QGIS in the correct position. If you have other ideas on how it could work, please let me know :D