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Simulation platform motion compensation.

Discussion in 'VR Headsets and Sim Gaming - Virtual Reality' started by DEADBEEF, Jul 7, 2016.

  1. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Motion platform
    This is my second rig using a Oculus, the first one using DK2 did have metal close to the head. But as an experiment as detailed above, I used a big metal bar and moved it all around the HMD and also sat it right next to a running actuator motor. No effect to the image in the HMD. If your having to reset I expect the cause to likely be something else. I have a thread which goes into some of the issues with Oculus CV1 tracking in regard to motion rigs. https://www.xsimulator.net/community/threads/that-sinking-feeling.8762/#post-110607 Who knows what other 'undocumented features' that the Oculus has?
  2. MacThai_75

    MacThai_75 Member

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    Very interesting.
    Thanks for the link!

    As indicted, I have general recentering issues that do not always appear, it's intermittent and semi-infrequent, but also in 'all' directions.
    Once again ... this is with a stationary rig.

    Maybe, I'll pull my pit apart and see if the issue goes away when I go back to a desk.
    I'll need to take it apart anyway once I get a motion rig.
  3. MacThai_75

    MacThai_75 Member

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    I got an answer from Oculus (yeah .. on a Sunday!) that kind'a opens up a new door that might be an issue for some.
    Not so much with the magnetometer or EMF as I speculated, but certainly much easier to deal with by just covering any IR reflective surfaces with something non-reflective to IR.

    Here's what they said ..

    Thanks for reaching out to us about this issue. Metal and reflective surfaces can interfere with the tracking. The Rift has IR tracking dots all over the headset too that are unseen to human eyes so it may be reflecting that signal from the back of the headrest or something and causing issues. Using a different material may help resolve the issue. Currently it is not possible to disable hardware components within the Rift individually, but you may find useful info on the developer forums. I hope you have a nice day, take care!

    Thanks,

    George
    Oculus Support


    So a better answer than I expected and if anyone had tracking issues that cause you to need to recenter, make sure you don't have IR reflective surfaces in the proximity of the HMD that might reflect the IR LEDs as he said, or actually from any part of the HMD as you turn your head.
    It all might be just that simple, and would help explain the difference between my experience with no issues at my wooden desk, while having some in my metal framed high seatback cockpit.
    Anyway ... easy to eliminate.
    Last edited: Sep 12, 2016