Bug New Pit Limiter Bug

Discussion in 'Community Support' started by Joe Ore, Sep 15, 2021.

  1. Goffik

    Goffik Well-Known Member

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    Not sure who taught you, but there's a hell of a lot more involved in even elementary physics than that.
     
  2. Maskerader

    Maskerader Well-Known Member

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    Educate me then. Maybe a link or something.

    Upd: Or if you understand these things better than me, then please answer the rest of my post. What am I missing, where am I wrong, where does the energy come from to increase the car's speed and kinetic energy.
     
    Last edited: Jun 30, 2022
  3. Maskerader

    Maskerader Well-Known Member

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    We can also look at it from the energy point of view. A car, as a body with mass, has more kinetic energy at, say, 63 km/h than at 60 km/h. Where does this energy come from if fuel is cut at 60 km/h? The car's inertia, as in Newton's first law's inertia, is not the answer: it doesn't generate energy.

    It could be inertia of the engine, drivetrain and wheels: during a wheelspin they are spinning faster than if the wheels weren't slipping. So when they are slowing down and the wheels are regaining traction, that kinetic energy of their excessive rotation transfers to the kinetic energy of the moving car.

    Is that what's happening?
     
    Last edited: Jul 5, 2022
  4. Vale

    Vale Well-Known Member

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    Also take into account if the pitlane is uphill or downhill and wind direction.
     
  5. Maskerader

    Maskerader Well-Known Member

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    Could be, but that doesn't apply to Lausitzring (its pitlane is pretty flat) and Raceroom (wind isn't strong here).
     
  6. Alex Hodgkinson

    Alex Hodgkinson KW Studios Developer

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    That is a factor.

    You have to be aware that acceleration is not instantaneous even if the forces applied are. Say we start with a velocity of 0kph and apply a force which will theoretically give an acceleration of 2m/s/s to an object. We won't see that acceleration immediately as the inertia has to be overcome. In the same way that if a vehicle is accelerating at 2m/s/s and we remove the propulsive force, it won't instantaneously begin decelerating. The initial reaction will be a swift but measurable reduction in acceleration down to zero.
     
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  7. Maskerader

    Maskerader Well-Known Member

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    That's what I'm trying to understand. I get it we aren't looking at it from a very basic model point of view - a body and a force - but something more complex? What exactly does the game take in account to simulate this behaviour? Is there a rate of acceleration drop hardcoded into the model? Is there simply a lag between when speed limiter triggers and when the engine stops producing torque?

    But that's not the same, is it? Lack of acceleration is not the same as deceleration.

    Sorry for being nit-picky. It's just the way you describe it sounds to me like the basic principles of physics are broken, and I'm not familiar with what happens under the hood in the game to fill in the required gaps myself.
     
    Last edited: Jul 5, 2022
  8. bubblejohns

    bubblejohns Active Member

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    also lets not forget teams set and reset their pit limiter every race, if its 80 kmph you'll probably have it set near that if its an uphill pit lane, if its down hill and we have many of those it can be set as much at 10kmph lower. my issue is how hard and sudden the limited slams on and off, should be much more of a burble and cut sooner, its like a car thats dropped a lot of cylinders. but really we dont have access to specifically setting the pit speed ourselves so some over speed will always be an issue
     
    Last edited: Jul 6, 2022
  9. Alex Hodgkinson

    Alex Hodgkinson KW Studios Developer

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    There's nothing "under the hood" or game specific going off here. I'm literally just describing how inertia works in the real world.
     
  10. Maskerader

    Maskerader Well-Known Member

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    The game is not the real world, it's a bunch of simplified models that are used to simulate some real world phenomena. In one of the basic models that is Newton's physics, inertia doesn't work like you described. Therefore, there must be something else going on in the game that affects the car. All that "something else" I called "under the hood" because I don't know what exactly the game does and doesn't simulate and how complex the simulation is.

    If inertia of the spinning engine, drivetrain, and wheels is only one factor, is there anything else?
     
    Last edited: Jul 7, 2022
  11. Maskerader

    Maskerader Well-Known Member

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    So I tested it a bit and this at least plays a major role:
    I couldn't manage to overshoot the speed limit without the wheelspin or without pressing and then releasing the clutch when near the speed limit. Without that, the car stayed below the limit even if it was a high-powered car like FRX17, Greenwood Corvette or ID.R.
     
  12. Alex Hodgkinson

    Alex Hodgkinson KW Studios Developer

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    Having thought about your angle for a bit I'm sure what you are confusing is acceleration and velocity. If we were talking about constant velocity where accelerative forces are equal to their opposite, then yes you would see instantaneous deceleration.

    Have a re-read of my explanations in this thread. If it still doesn't click I don't know what to suggest. I've tried but I don't think I can put what's going off in any simpler terms now.
     
  13. Maskerader

    Maskerader Well-Known Member

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    "Velocity is the directional speed of an object in motion as an indication of its rate of change in position"
    "Acceleration is the rate of change of the velocity of an object"
    "A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force."

    Checks out with how I understand it.

    If we're talking about this level of simplicity, a body won't keep increasing its velocity (even for a brief moment) if a force doesn't act upon it anymore (or if sum of forces becomes zero). Even if we take that Newton's first law doesn't explicitly say what happens the moment the force disappears, from the law of conservation of energy we can say the body won't keep gaining more kinetic energy if there's no force to do that work.

    Where am I wrong?

    This model doesn't explain a car overshooting the speed limit. The only way to explain it is add more elements to the model.

    (Also the game seems to support my point of view.)
     
    Last edited: Jul 7, 2022
  14. S. FREDRIKSSON

    S. FREDRIKSSON Active Member

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    The force will not be instantly turned off when you release the gas pedal
    If you are spinning the wheels, more force will be applied to acceleration as the stop spinning and grip the ground.

    At least thats how I understand it and it makes sence both IRL and in the game.
     
  15. Vale

    Vale Well-Known Member

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    Yes, that´s how traction control works too. Cut the gas to regain actual grip over wheel rotation speed and gain momentum. Same as with dragster burnouts.
     
  16. Alex Hodgkinson

    Alex Hodgkinson KW Studios Developer

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    A car may overshoot the pit speed limit if it's accelerating hard when the limiter is engaged. That's what you seem to be missing.
     
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  17. Maskerader

    Maskerader Well-Known Member

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    And we're back to where our discussion started... Anyway, thank you. The game is great and that's all that matters at the end of the day.
     
    Last edited: Jul 8, 2022
  18. Maskerader

    Maskerader Well-Known Member

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    But the speed limiter in the game seems to be fast enough to cut the fuel and stop the acceleration when there's no wheelspin. In my tests the cars didn't even reach 60 km/h, they stayed at 59 km/h.
    (Upd: Could be I didn't accelerate hard enough. It would be interesting if anyone tries it too and gets different results.)

    Yeah, that's what I think is happening, wheelspin is the key, not the acceleration.
     
    Last edited: Jul 8, 2022
  19. Roland Horn

    Roland Horn New Member Beta tester

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    Are you now taking the developers' time to conduct fundamental physical discussions? If you have deficits in this topic, there is a lot of specialist literature on the Internet, freely available.
     
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  20. Maskerader

    Maskerader Well-Known Member

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    I'm pretty sure Alex is capable of managing his own time and he doesn't have to answer my questions if he doesn't want to.

    As for the deficits, be sure I checked and rechecked all the things I referenced to, and asked a friend in case I still managed to interpret it wrong.
     
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