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Traction loss w/attached monitors

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by paredaks, Nov 17, 2016.

  1. paredaks

    paredaks New Member

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    Ok, so @Nick Moxley knows I'm grasping at straws, but I need help spiritually letting go of something here. I have a beautifully designed (and built, ahem) sim rig. I'm going to be converting it to a 2DOF compact seat mover with traction loss, but it's come up that I will need to detach the monitors from the body of the rig to properly enable traction loss.

    Basically, if the monitors move with the slide, there's a disconnect in immersion and physics (maybe mess with your inner ear, too).

    Is there anyone who can convince me (and the world at large) that it's a good idea to keep my monitors attached to a moving frame? Any bright ideas on maintaining the aesthetic without simply detaching the monitors and balancing them between two posts (as the rational individual would d0)?

    Photo below. In principle the seat will move on a u-joint, and the rig's platform will lay on top of a traction loss layer.

    [​IMG]
    [​IMG] [​IMG]
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  2. obobo

    obobo Active Member

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    I may be saying a stupidity, but if you plan to disconnect only the seat and make it mobile in 2DOF and TC (3DOF not?)
    You install the seat mover on a platform that handles the TC so your whole structure remains solid and one-piece
    Because finally, by car it is the body that gives the feeling, I do not feel the windshield and the pedals move but me yes!
  3. paredaks

    paredaks New Member

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    Right, 2DOF and TL only.

    It's a valid option - I've been trying to visualize it myself. If I put the seat on its own sliding platform my hands (wheel) and feet (pedals) wouldn't move. I worry it would feel like my backside was slipping out from underneath me, rather than a simulation of full-body g-forces. People with more motion simulator experience than I are better judge of what feels 'right'; I'm happy to be proven wrong (errr, course-corrected).
  4. obobo

    obobo Active Member

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    I did the test this morning when I left with the car, the rear slipped and I thought I was rocking in my seat, not that my pedals and my steering wheel followed the movement.

    On momoclic post here: http://pcshm-simulateurs-homemade.clicforum.com/t483-Le-simulateur-de-momoclic.htm

    It presents a solution to create a Traction Loss effect (and not TC as I had marked!)

    Installs a 2DOF system on it and I think it will meet your expectations.
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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  6. MarkusB

    MarkusB Well-Known Member Gold Contributor

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    I disagree. Imagine the monitors as the windows of your car, and the content displayed on the monitors as the outside world.
    Your car windows also move with each movement of the car, and the simulation software shows the virtual movements of the outside world.
    So in my opinion it would be most realistic if the monitors move together with the seat, especially regarding traction loss.

    Regarding the 2DOF movements pitch (which you will use for simulating surge) and roll (which you will use for simulating sway), it would probably be a good idea to just move the seat on top of the sliding part.

    I don't know. Did I? :)
  7. obobo

    obobo Active Member

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    You forget that you do not roll unlike a real car, so do not compare the reaction of a real car and the simulator, you just have to reproduce the feel of the pilot.
  8. MarkusB

    MarkusB Well-Known Member Gold Contributor

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    I completely agree, and I did not forget this.
    I just wanted to explain that - at least in my opinion - it is not unrealistic to have the monitors move together with the traction loss movement of the rig.

    Roll/pitch are completely other stories, since in a 2DOF simulator they are used to simulate other forces. In driving simulations mainly surge and sway, and maybe also heave.
    Last edited: Nov 17, 2016
  9. paredaks

    paredaks New Member

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    Oh yes I did. First stop (after bugging @Nick Moxley ). Re-read the threads, watched the videos, looked on youtube...It's just that virtually everyone has a more complex, shoulder mounted arms (vs my compact seat) and/or additional DOF. Lots of videos of people in VR these days. I couldn't find anything that addressed the conceptual issue of monitor placement and TL, though I did find discussion of what TL actually simulates and how to dial that in with motor control.

    Thanks @MarkusB . I suppose there is a question of whether the monitors might shake with roll/pitch, but the lesser impact and violence of under-seat arms should minimize that. They won't, of course, be tilting and pivoting with the seat movement.

    More feedback from actual motion simulator users please! Feed me....


    ps: for the record it's not impossible to build the TL, try it out, then modify if necessary. It's just less than ideal, since I need to get in there soon and modify the rig to strengthen it for a new OSW wheel and would rather bite the bullet now if I need to.
  10. paredaks

    paredaks New Member

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    Oh, and I noticed the large, arcade installations tend to have monitors attached but I could see that being for other functional reasons like installation security, portability, maintenance, less chance of damage from freestanding parts...and some of them are massive, elevated 6 DOF monstrosities too!
  11. Blame73

    Blame73 Well-Known Member

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    Build the 2DOF/3DOF then buy yourself a Rift/Vive and you'll get rid of the monitors ;)
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  12. obobo

    obobo Active Member

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    I completely agree with that
  13. paredaks

    paredaks New Member

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    Yea, I actually have a Rift, was in the first pre-order batch. Don't find it as much fun, to be honest. I use it, but not all that often. I have enough motion sickness that comes up that it's a bit of a turn-off. Plus I play other non-VR games and use the machine for other stuff. So I want to optimize my triples and motion, at least for the foreseeable future.

    I still enjoy seeing the wheel, operating buttons, spacial 5.1 sound, and looking at my sweet rig <grin>
  14. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    You are likely to find that high quality motion simulation will help reduce VR sickness, as it adds further reinforcing ques for your brain.

    Poor motion does the opposite, if it does not match what the brain expects it is likely to increase nausea.
    • Agree Agree x 2
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My 3DOF compact motion sim is 500X500mm, I don't have a traction loss frame under it but there is no reason I couldn't if I wanted to.

    You can still have a compact motion sim and traction loss if you want, it is just a design parameter.
  16. paredaks

    paredaks New Member

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    Oh sure, I'm not doubting compact+traction. It's just the original question - whether or not the monitors can/should stay attached to the moving TL platform. That's the research / opinion I've been coming up short on.

    I know your build for sure; it's very cool and I'll be referencing it when I start the functional design (not this big picture stuff). Cause there's no way I'm doing this alone! Interesting point on the VR, btw.
  17. paredaks

    paredaks New Member

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    Actually, come to think of it i'm going to just start the build thread tomorrow. Have some time to consolidate research, draft the plan.
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  18. obobo

    obobo Active Member

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    I think you can insert the TL and the base 2DOF in a space that does not really change the size of your current simulator
  19. Nick Moxley

    Nick Moxley Well-Known Member

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    TL requires XX amount of real estate, there's no real getting around that imo.
  20. obobo

    obobo Active Member

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    The size of the system with TL will not really change. once in motion the system does not necessarily have to move a meter either
    • Disagree Disagree x 1