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iclaus
New Participant
July 11, 2014

DK2 refresh rate questions

Hello everyone!

This is my first post here on the oculus forums and here goes.

While looking for a wireless display solution for the new oculus development kit, I noticed that most transmitters that offer -2ms latency cap out around 1080p at 60hz. Does the DK2 require a 75hz input or is that taken care of at the "box" before it reaches the headset?

example: 1080p 60hz output from desktop - to signal box (upclocked? 75hz) - headset.

If i am totally wrong thats fine. I just cant seem to find any info on it.

    9 replies

    baloniman
    Up and Coming
    July 11, 2014
    If you want a good experience I'd suggest just using the cable connection. Adding wireless will increase your latency and make the experience worse for what seems like a minor improvement for comfort. You'll still have the cable tethered to a transmitter box so it's still going to be there. Also consider yourself moving a distance from the wireless receiver and possibly getting even more latency. As for the refresh rate when you set the target monitor in windows display properties the refresh rate options will change to match that target device ( rift display ).
    investman
    New Participant
    September 19, 2014
    Hi, quick question,
    I have a monitor that supports only 60Hz. Can I still get 75fps on the Rift?
    From the discussion I believe that I need to set the Rift as a primary display? (I don´t have the Rift yet so I can´t try it out)
    Is this correct?
    Thank you.
    teknix1
    Up and Coming
    September 24, 2014
    Yes, you can still get 75 Hz on the rift. I'm in the same situation.

    From my experience (someone correct me if I'm wrong), direct to rift apps will drive the 75Hz automatically. When using the extended mode, which causes me a lot of trouble in getting things right, I wished they'd just get rid of that, you have to worry about which is the monitor the demo starts on. Tricks have been to make the rift the primary display, which gets you into trouble quickly because every new window wants to open there and then you can't really navigate it. Or leave it as secondary and use bilago's (going by memory here) oculus service launcher and use the context option to launch on your rift by right clicking the exe and choosing the new option. Even that's still hit and miss, so you will need to use a combination of alt-enter (maximize) and Shift-Windows-Left (or right) arrow to move the full screen application from one monitor to another. If you get judder, most likely the application is vsynching on your 60Hz monitor and causing the judder on your rift (you will know about the judder when you see it, quite unpleasant). Which is why you want to launch the demo on the correct display in the first place.

    Good luck!
    Nic
    baloniman
    Up and Coming
    September 24, 2014
    The main benefit of setting your main display to 75Hz is that some games may have been built with with vsync enabled from the engine build settings. It will read into your main display to get the refresh rate and lock you to 60 based on the moniter. I believe this is only a problem when launching applications in extended mode. You can add a tag in the shortcut to set the display adapter but its a pain to do that for each separate short cut. Now I think Bilago's tool allows for an easy way to do this so it may be worth checking out if you haven't already.

    Your monitor may support 75Hz at a lower resolution which will allow you to do what I said above. Just make sure you force the application resolution to 1080p. With Unity demo's you can Ctrl + Double click the application icon to get the game settings to change the resolution up to 1080p if you had to lower it to reach 75hz on the moniter.

    Hope this helps! Cheers!
    owenwp
    Up and Coming
    September 24, 2014
    The Rift supports 60hz, but then it will not be low persistence and you will have motion blur.
    jherico
    Inspiring
    September 24, 2014
    "owenwp" wrote:
    The Rift supports 60hz, but then it will not be low persistence and you will have motion blur.


    Low persistence is supported at 60 Hz, it's just not automatic, like it is (supposed to be) at 75 Hz. You can see a clear difference toggling it on and off in an application running against a 60 Hz display.
    Brad Davis - Developer for High Fidelity Co-author of Oculus Rift in Action
    Anonymous
    October 30, 2014
    "baloniman" wrote:
    The main benefit of setting your main display to 75Hz is that some games may have been built with with vsync enabled from the engine build settings. It will read into your main display to get the refresh rate and lock you to 60 based on the moniter. I believe this is only a problem when launching applications in extended mode. You can add a tag in the shortcut to set the display adapter but its a pain to do that for each separate short cut. Now I think Bilago's tool allows for an easy way to do this so it may be worth checking out if you haven't already.

    Your monitor may support 75Hz at a lower resolution which will allow you to do what I said above. Just make sure you force the application resolution to 1080p. With Unity demo's you can Ctrl + Double click the application icon to get the game settings to change the resolution up to 1080p if you had to lower it to reach 75hz on the moniter.

    Hope this helps! Cheers!


    Hi guys, I'm looking into buy a new monitor, and I am anticipating that the CV1 will feature a higher refresh rate than 75hz. If that is the case, do you think I should look to buy a monitor that have as a refresh rate of 120hz max, instead of 75hz?
    jherico
    Inspiring
    October 30, 2014
    "arlevi09" wrote:
    Hi guys, I'm looking into buy a new monitor, and I am anticipating that the CV1 will feature a higher refresh rate than 75hz. If that is the case, do you think I should look to buy a monitor that have as a refresh rate of 120hz max, instead of 75hz?


    Presumably by CV1 Oculus will have direct mode issues ironed out, making the refresh rate of the monitor superfluous. Even if you get a 120 Hz monitor there's no guarantee that it will support exactly the refresh rate that CV1 will have.

    Even if it does have the same state rate, setting the primary monitor to the same refresh rate as the Rift isn't actually a solution. It's simply a hack that makes the judder mostly disappear, but isn't actually solving the underlying problem.
    Brad Davis - Developer for High Fidelity Co-author of Oculus Rift in Action
    Anonymous
    October 31, 2014
    "jherico" wrote:
    "arlevi09" wrote:
    Hi guys, I'm looking into buy a new monitor, and I am anticipating that the CV1 will feature a higher refresh rate than 75hz. If that is the case, do you think I should look to buy a monitor that have as a refresh rate of 120hz max, instead of 75hz?


    Presumably by CV1 Oculus will have direct mode issues ironed out, making the refresh rate of the monitor superfluous. Even if you get a 120 Hz monitor there's no guarantee that it will support exactly the refresh rate that CV1 will have.

    Even if it does have the same state rate, setting the primary monitor to the same refresh rate as the Rift isn't actually a solution. It's simply a hack that makes the judder mostly disappear, but isn't actually solving the underlying problem.


    Thank you! I guess I'll go with a cheaper monitor then :)
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