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Change physics calculations per second?

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by Nissan Skyline, Dec 22, 2016.

  1. Nissan Skyline

    Nissan Skyline
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    I believe the game does 2000 physics calculations per second.
    First: Would the engine allow to reduce that?
    Second: If that is possible, would that improve performance with a low-spec CPU?
    Third: If it can be done, and there is gains, is there a file I can modify to change this?
     
    #1 Nissan Skyline, Dec 22, 2016
  2. Blijo

    Blijo
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    1, yes, but you won't play in realtime because it has to do 2k/sec for running realtime
    2. no, it enables when you get less then 20 fps
    3. no idea, i dont think so
     
    #2 Blijo, Dec 22, 2016
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  3. Nissan Skyline

    Nissan Skyline
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    So 2x Slo-Motion is effectively running 1000 calculations per second?
     
    #3 Nissan Skyline, Dec 22, 2016
  4. Blijo

    Blijo
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    I don't know, @Nadeox1 or @tdev should know wether I'm making a fool out of myself now
     
    #4 Blijo, Dec 22, 2016
  5. estama

    estama
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    BeamNG Team

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    First: The engine can do that
    Second: Yes it would improve performance.
    Third: This is not exposed to the users because ...

    ... the vehicles would immediately blow up.

    This happens because there is a correlation between physics stability and number of physics steps. The stiffer a structure is (like a car) the higher the number of physics steps that are required to keep it stable. It turns out 2000 steps is the minimum to reach metal like stiffness. At around 4500 you start to touch the range of diamond like stiffness [*].

    [*] Take these numbers with a large grain of salt, because there are a lot of complexities in how these things are calculated, and apart from the steps there are 1000 other things that affect the stiffness numbers.
     
    #5 estama, Dec 22, 2016
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  6. estama

    estama
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    BeamNG Team

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    Yes indeed at 2x slow-mo, it is 1000 physics steps/sec.

    But.

    You'll be actually seeing a bigger percentage of physics steps. At normal gameplay you see 2.5% of these 2000 steps (if your graphics cars runs at 50 FPS). If you slow it down by 2x, you'll be seeing 5% of the 1000 steps that happen every second.
     
    #6 estama, Dec 22, 2016
    • Informative Informative x 4
  7. Nissan Skyline

    Nissan Skyline
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    Very interesting. I am assuming this is how the April fools video of the indestructible car was made?
     
    #7 Nissan Skyline, Dec 22, 2016
  8. NoxiousFumes

    NoxiousFumes
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    Any way to change that? I need to blow up stuff. Also, I want to mess around with diamond like stiffness and stuff like that.
     
    #8 NoxiousFumes, Dec 23, 2016
  9. Diamondback

    Diamondback
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    Vehicle Systems Lead
    BeamNG Team

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    No, that was just a globally scaled beam deform/strength value ;)
     
    #9 Diamondback, Dec 23, 2016
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  10. randomshortguy

    randomshortguy
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    In BeamNG terms, "blow up" doesn't mean a fiery explosion or anything dramatic. It means the car becomes spaghetti and causes instability which crashes the physics engine basically instantly. Not very fun. You can also make cars hard as diamond with what Diamondback said above, by scaling the car's deform values.
     
    #10 randomshortguy, Dec 23, 2016
    • Agree Agree x 1
  11. gigawert

    gigawert
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    #11 gigawert, Dec 23, 2016
    • Informative Informative x 1
  12. NoxiousFumes

    NoxiousFumes
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    I know. I just want to mess around with the physics to see what happens.
     
    #12 NoxiousFumes, Dec 23, 2016
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