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SteamVR Motion Smoothing introduced

Discussion in 'VR Headsets and Sim Gaming - Virtual Reality' started by noorbeast, Oct 18, 2018.

  1. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    SteamVR Motion Smoothing has just been introduced into the Beta branch of SteamVR: https://steamcommunity.com/games/250820/announcements/detail/1696061565016280495

    How it works:

    When SteamVR sees that an application isn’t going to make framerate (i.e. start dropping frames), Motion Smoothing kicks in. It looks at the last two delivered frames, estimates motion and animation, and extrapolates a new frame. Synthesizing new frames keeps the current application at full framerate, advances motion forward, and avoids judder.

    This means that the player is still experiencing full framerate (90 Hz for the Vive and Vive Pro), but the application only needs to render 1 out of every 2 frames, dramatically lowering the performance requirements. Even better, if synthesizing a new frame for every frame delivered by the application still leads to performance issues, Motion Smoothing is designed to scale further down to synthesize 2 frames or even 3 frames for every 1 frame delivered.

    What it means for you:

    From the player’s perspective, what was previously a game that would hitch and drop frames producing judder is now a game that constantly runs smoothly at 90 Hz. SteamVR Motion Smoothing improves upon the previously released Asynchronous Reprojection to enhance the overall experience for customers across a wide variety of VR systems. Not only can lower-end GPUs now produce smooth frames in applications that were previously too expensive, higher-end GPUs can now render at an even higher resolution increasing the fidelity of all experiences on all VR systems.

    This feature is ready to kick in the moment an application starts dropping frames and shuts off when no longer needed. Of course, if you prefer to run without this feature, just look under ‘Settings > Video’ or ‘Settings > Applications’ to control when it is enabled. Motion Smoothing is not enabled when using Oculus Rift or Windows Mixed Reality headsets with SteamVR, because their underlying display drivers use different techniques when applications miss framerate.

    Motion Smoothing is in beta and currently only enabled for systems running Windows 10 with an NVIDIA GPU.
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  2. dododge

    dododge Active Member Gold Contributor

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    FYI there are apparently some compatibility problems between this SteamVR beta and the OpenVR Input Emulator that is used for motion compensation (among other things).

    There's an issue open about it, plus various discussions on Steam forums and reddit where folks have been reporting weird compositor crashes until they uninstall these sorts of add-ons.
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    Advanced Settings is another that is affected, unfortunately new Beta features tend to have that short term impact on external plugins, hopefully they won't take too long to get sorted.

    As an aside the first SteamVR beta update for Motion Smoothing was pushed not long after the initial release, so things are happening petty quickly. It was also announced that Motion Smoothing was mostly working for AMD cards, but some further work was required before support could be released.