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PHYSICS Introducing the 5 point tyre model for ACC!

Discussion in 'ACC Blog' started by Aristotelis, Jul 18, 2019.

  1. VoodooChild

    VoodooChild Gamer

    this is extremely interesting, and a very clear explanation of why curbs give so many issues in ACC as well as in other games.

    I'm very impressed Aris, and well done Kunos.
  2. LeonSuetfeld

    LeonSuetfeld Alien

    I agree.

    To me, the core driving experience is the most important aspect of a sim, and it was flawed. I'd get frustrated more than I was able to enjoy the game, and this was exactly what was causing it. I found myself spending more time in sims with predictable physics, even KartKraft despite the extremely low amount of content in it. On that note, I believe for the enjoyment of a sim, the predictability of the physics is more important than the realism. The irratic ground collisions and the CoD issues of ACC almost killed it for me. Now with these changes I'm confident that both of these issues are fixed and I can get back into it. Looking forward to trying this after my vacation, if it's out by then.

    So Aris, Lord Kitty, Fabio and Fernando: Thanks a lot for your efforts and for finally hearing our prayers (and posts), this is awesome.

    Another thing that's on my mind: The last bit of predictability issues would be the occational skipping of anti-cut curbs due to the update rate of the physics.
    Let's say the contact patch is 4cm long, and we're going 150kph (41.67m/s). Then in order to cover each part of the asphalt exactly once with that patch, we'd need roughly a 1000Hz update rate. If we say it's enough to have all tire-ground point contacts calculated at 2 cm apart (longitudinally), we can shift the contact patch by 6cm per update to reach good "coverage". That would be the case at about an update rate of 666Hz.

    So... any chance of that happening with ACC or will we have to wait for AC3? ;-)

    How "long" are the front and rear contact points spaced apart, and what is the current update rate on ACC? Still at 333 Hz?
  3. Coanda

    Coanda Alien

    hmmm so Stefano finally worked out how to clone you... sneaky dog :p:D

  4. Coanda

    Coanda Alien

    Legendary Aris & co :cool:
    ryszard.zukowski likes this.
  5. Gevatter

    Gevatter Alien

    If it hasn't changed IMO it's 111 Hz.
  6. LeonSuetfeld

    LeonSuetfeld Alien

    AC was at ~333Hz. the 111Hz might be other updates (AI, collisions, etc), but the tire-to-road-update rate should be at least 333Hz.
  7. Timberwind

    Timberwind Racer

    I would be fine with the fact, if Aris was spending half of his workday on writing blog posts like these. Amazing!
    Christian Guse-Mann likes this.
  8. Coanda

    Coanda Alien

    ... and I thought ACC was dead in the water :rolleyes: according to the brat pack, you guys already shut up shop, cashed in your cheques and pi$$ed off to Jamaica... w@ankers! maybe you guys should though, however only after v1.20 :p:D:cool:
    Last edited: Jul 18, 2019
    GroteBakkes likes this.
  9. Seven Smiles

    Seven Smiles Gamer

    I'm completely unaware of what you are referring to but it seems to me this fix confirms that Nicki Thim was right to complain?

    Refactoring the code from a single point contact model to a 5 point contact model without greatly affecting performance sounds like very clever software engineering :cool:
    Last edited: Jul 18, 2019
    Freddie Seng, Loeki, esox71 and 4 others like this.
  10. trasgu

    trasgu Simracer

    He was right to complain as the issue existed, but the way he chose to convey it wasn't and that is what I meant.
  11. Oblit0r

    Oblit0r Alien

    Really exciting news!
    ryszard.zukowski likes this.
  12. p4thos

    p4thos Rookie

    Just awesome work!
    ryszard.zukowski likes this.
  13. MiroZG

    MiroZG Gamer

    I must say that i am really excited about this , and hope will really work and perform as intended without too much extra process power :)
    ryszard.zukowski likes this.
  14. bgil66

    bgil66 Alien

    Just looked up Rfactor PRO, very cool!
    Can't wait for this new ACC update to drop:)
  15. m_box97

    m_box97 Simracer

    As always a pleasure to read, looking forward to the update. Really appreciate the effort from the team!
    ryszard.zukowski likes this.
  16. A-Jin

    A-Jin Racer

    ACC is THE best simulator in market no doubts.
    ryszard.zukowski likes this.
  17. Znam Neznam

    Znam Neznam Hardcore Simmer

    Sounds great.

    Hope this makes it into AC1 one day.

    AC1 6 years in, has still massive following and player count.

    LATE4APEX Alien

    As am I, will make me a better driver,... ;)

    But do also have concerns about the possibility of more CPU load,... but nothing is free in reality or simulators.
  19. Aristotelis

    Aristotelis Will it drift? Staff Member KS Dev Team

    Just to make clear that you'll get IDENTICAL performance from the new tyre model.

    LATE4APEX Alien

    It just keeps on getting better,... :)
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