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Ghosting problem on Vive Pro 2


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Hi everyone, I hope I'm posting in the right place.

I'm working on a mixed reality project that runs at most at 30 FPS and I would like to render it on the HTC Vive Pro 2 at its original frame rate. I noted that the rendering in the HMD suffers from a "ghosting" effect when the user turns his head around. I suppose that the problem is caused by the "Motion Reprojection" (or Async Reprojection) that is done under-the-hood to maintain a 90 Hz framerate on the HMD. 

I could not find any way to disable this feature and allow me to render a (at most) 30 FPS video stream on the HMD.


Here's what I've tried up to now:

  • Hit the Shift+A key binding in the SteamVR mirror screen
    • Any log is prompted in the developer console
  • Click on the "async_mode_toggle" in the Debug Command window
    • I get the following logimage.png
    • But the console does not tell me if I toggled ON or OFF. Anyway, I repeated this process more than once to test either toggles.
  • Given above points, I was not sure I was effectively disabling the reprojection, so I went to the VIVE Console -> Headset Mirror -> Mirror Mode -> Show Info and check the "Reprojection count" stat
    • Even if I (theoretically) disable the async mode from the Debug Command, the reprojection count still adds up, hence I'm not sure the disabling is effectively happening.image.png


Additional information:

  • Windows 10 latest update
  • i9-11900K
  • NVIDIA GeForce RTX 3080 Laptop (v511.65 drivers)
  • 64 GB RAM
  • DirectX 12


Am I right on thinking that the problem is the "Motion Reprojection"? If so, do you have any suggestion on how to disable it / effectively run an application at its real frame rate, i.e. without interpolated frames? 

Edited by SimoneSantillo
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