Hi guys, working on getting my Quest 2 tuned well for MSFS and exploring the possibility of using some sort of motion reprojection instead of just disabling it everywhere as I've heard people tend to do.  I'm kinda confused on the diffferences between the various options for it though.  I know in the debug tool I can set the Oculus equivalent of ASW, but then I noticed in the sim in the VR display settings there is also a "motion reprojection" option with two settings that have like zero explanation as to what they do.  I see the in sim options of "depth" or "depth and motion".  Every time I set it to the combo it has set it to depth when I go back in.  If I wanted to run reprojection on, should I use ASW, the sim settings, both?  I don't really know what happens if you turn it on in sim while having ASW as well.  I know it will do it, but I couldn't tell what the difference was when I did it.  I was using the built in Oculus performance display to check FPS and it didn't really change with any of those options.

On 2/17/2023 at 11:34 AM, flyinion said:

Hi guys, working on getting my Quest 2 tuned well for MSFS and exploring the possibility of using some sort of motion reprojection instead of just disabling it everywhere as I've heard people tend to do.  I'm kinda confused on the diffferences between the various options for it though.  I know in the debug tool I can set the Oculus equivalent of ASW, but then I noticed in the sim in the VR display settings there is also a "motion reprojection" option with two settings that have like zero explanation as to what they do.  I see the in sim options of "depth" or "depth and motion".  Every time I set it to the combo it has set it to depth when I go back in.  If I wanted to run reprojection on, should I use ASW, the sim settings, both?  I don't really know what happens if you turn it on in sim while having ASW as well.  I know it will do it, but I couldn't tell what the difference was when I did it.  I was using the built in Oculus performance display to check FPS and it didn't really change with any of those options.

"Depth and Motion" isn't supported by any vendor at this time. That's why it keeps reverting out to Depth only 🙂

Depth Reprojection is an improvement of the typical "late stage reprojection" (NOT ASW) meaning it transforms the image rendered by the game right before it is displayed in your headset, by using the most recent tracking data. This makes the headset tracking feel smoother, especially for objects immediately close to you. Having the Depth (instead of not having it) helps with correcting the perspective better and more naturally. It does not affect frame rate, and therefore moving objects in the scene do not feel smooth with it and might still look like they stutter or teleport.

Motion Reprojection (or ASW) is a form of reprojection that creates new frames to match the refresh rate of your headset (in other words, it emulates your headset running at full frame rate by filling the blanks left by the game running too slow). These new frames are created by propagating the movements in the scene to make objects and scenery look smooth. It is combined with the other form of reprojection above (with or without depth) to also make head movements smoother. Motion Reprojection requires a more powerful GPU and consumes more resources. Uncertainty in motion propagation can lead to visual glitches (object shapes being stretched out or compressed).

The "Depth and Motion" option (that again, does not work with any headset today) is what is called AppSW, an advanced form of ASW where the game provides better hints about motion in the scene, to avoid the visual glitches of ASW mentioned earlier.

You may combine both forms of reprojection, ie enable ASW in Oculus software and also set Reprojection Mode to Depth.

I find there is little-to-no reason to not enable Depth Reprojection, unless for some reason it affects your FPS too much.

Whether you want to use ASW or not is up to you and whether you can live with visual glitches or not.

Edited February 19, 20233 yr by mbucchia

Great, thank you so much for the explanation. I’ve watched channels like VR Flightsim Guy talking about reprojection vs running with it off and it was unclear if they’re talking about the sim setting or HMD specific. With a 4090 I should have plenty of GPU power for ASW.