Nothing happens when trying to use the “Open in Twinmotion” command in Revit.

Issue:

Nothing happens when clicking on the “Open in Twinmotion” command or any other Twinmotion command from the View>Presentation tab. The commands are unresponsive, and no error message is displayed.

The following lines will be recorded in the Revit journal file:

Cause:

The Twinmotion Datasmith plugin failed to initialize due to a missing Registry Key or program files.
This is likely to happen after uninstalling the Unreal Datasmith Exporter for Revit or after removing Revit.

Solution:

For Revit 2024 and later, please take the following steps:

1. 1. 1. Make sure that Revit is installed and up to date.
      2. Verify that the RevitEngine folder exists - go to C:\ProgramData\Epic\Exporter\RevitEngine and confirm the existence of the folder, including the following 3 subfolders:
         1. 1.  Binaries
            2. Content
            3. Shaders
               Note: If these folders exist, go to the next step (3), if not, please skip to step 8 and reinstall Revit.
      3. Open the Registry Editor and go to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\EpicGames\Unreal Engine
      4. Create a new String Value and name it RevitEngineDir
      5. Open this String Value and input the following directory in the 'Value data' field - C:\ProgramData\Epic\Exporter\RevitEngine\
         
      6. Click OK, and close the Registry Editor.
      7. Reopen Revit and check to see if the issue persists.
      8. If the issue persists, or you were not able to find the corresponding directory in C:\ProgramData\Epic\Exporter\RevitEngine or it is missing any of the subfolders listed in (2) above, please reinstall Revit.

Installing the Datasmith Exporter for Revit can also resolve this issue (Revit 2023.1 or earlier must be present on the machine).

For Revit 2023.1 and earlier:

Install the latest Datasmith Exporter - UE 5.2.1 for Revit from here - Datasmith Exporter for Revit (Remove any previous versions).

If the latest Exporter - UE 5.2.1 is already installed, please uninstall and reinstall it.

See Related - Revit cannot export 3D view – Twinmotion is not installed