1. Do you need support for Assetto Corsa Competizione? Please use the proper forum below and ALWAYS zip and attach the WHOLE "Logs" folder in your c:\users\*youruser*\AppData\Local\AC2\Saved. The "AppData" folder is hidden by default, check "Hidden items" in your Windows view properties. If you report a crash, ALWAYS zip and attach the WHOLE "Crashes" folder in the same directory.
  2. FOR ASSETTO CORSA COMPETIZIONE: If you report issues with saved games, please always zip and attach your entire User/Documents/Assetto Corsa Competizione/Savegame folder!
  3. If your game executable is missing, please add your entire Steam directory to the exceptions in your antivirus software, then run a Steam integrity check or reinstall the game altogether.

Physics differences AC/ACC

Discussion in 'ACC General Discussions' started by chargingcar, Feb 21, 2018.

  1. Andrew_WOT

    Andrew_WOT Alien

    ACC is not using UE4 physics engine, it's modified engine from AC. I'd assume CPU usage will be similar, except more load from rendering.
     
    M-Bimmer and LeDude83 like this.
  2. Speed RacerX

    Speed RacerX Gamer

    Hey thanks for that tid bit. Can you say/know which version of UE4 being used? Because as I understand it the newer versions of UE4 support Vulkan. And I understand that Vulkan maybe in ACC.
    In my humble opinion, that would benefit everyone who has a 4core 4thread type of cpu.
     
  3. kunos

    kunos Alien

    at the moment the vulkan support is very shaky and not stable enough.
    Performance wise it runs slightly slower than DX11 and it crashes after few minutes, so no good news on that front ATM.
     
  4. Typer

    Typer Simracer

    Did you mean to say “compiles”? That’s a whole different kettle of fish right?
     
    Bolibompa and Minolin like this.
  5. rauf00

    rauf00 Simracer

    Thanks for insider, would be great to build a game on a newer API, of course if it can be used to for more efficient resource management.
    If Vulkan doesn't meet expectations, what about DX12 then?
    WinX 55% in Steam survey and still growing, ar. 75 of GPUs are DX12 ready, Forza is on DX12 and does not complain (except crappy UWP i bet).
     
  6. kunos

    kunos Alien

    Pretty much the same situation if not worse sadly. The truth is that the new breed of graphics API require an engine designed from scratch to really improve and a huge investment because of their complexity. A lot of stuff that used to be in graphics drivers has now been moved in the hands of engine devs. When you have a big beast like ue4 and a requirement to keep the compatibility with dx11 I can see how hard the task for Epic is. Not counting the fact that the performance improvement over dx11 is very application dependent and far from what marketing drums want you to believe.
     
  7. rauf00

    rauf00 Simracer

    Sad to hear that, but this is what could have been expected. Looks like DX12 in it's 4 years history has not become a natural standard.
    List of new titles directly developed on DX12 doesn't look impressive.
    https://en.wikipedia.org/wiki/List_of_games_with_DirectX_12_support

    Mainly Microsoft games like Forza which still had performance and stability issues long after release. If such giant team can't manage it, then who could?
    If think this this text cover it all
    https://www.dsogaming.com/editorial/the-state-of-dx12-games-in-2017-is-directx-12-losing-its-steam/

    Anyway I'm sure you guys have your ways to optimize Competizione and we will see large Blancpain grids full of detailed cars!
     
    Last edited: Jun 20, 2018
    Whitestar likes this.
  8. Epistolarius

    Epistolarius Alien

  9. Salajutsu

    Salajutsu Hardcore Simmer

    One of the worst timing points in gaming lineage.

    It wasn't until the GTX 10xx series that they added, specifically for DX12, A-synchronuous compute, which I guess is the "overhead reduction on CPU" DX12 was expected to bring.

    Though the 9xx series supports DX12 capability, it does not have this feature, which really seperated performance for DX12 titles so far.

    Forza Horizon 3 and GoW, I have a 980, 7th gen i7 and get between 81 and 35 fps. In fact, completely at random. Doesn't seem to matter what I'm looking at or where I am.
    Built friend's computer with GTX 1080, 8th gen CPU, bam, 130 fps nearly constant, more consistent and stable. Even 1060's in DX12 perform above my 980. Maybe not always, in every situation, but it's more consistent.

    IMO, it's really marketed hardware sales that's putting software in a rut.
     
  10. Speed RacerX

    Speed RacerX Gamer

    I recall getting into the pc gaming scene right around dx6/dx7. When the decision was made that newly released games were going to the next directx version you had to march your but to the store to get the hardware that supported it or you didn't play. Things started to settled down when DX9 hit though.

    Now a days it's not like that.
     
  11. M-Bimmer

    M-Bimmer Simracer

    +1
    (Would take any improvement on AC which still has one of the best physics out there)
     
  12. chakko

    chakko Alien

    Read the thread, that already has been answered for the most part.
     
  13. Rosko

    Rosko Hardcore Simmer

    It's disappointing Vulkan is not yet delivering, DCS & xplane11 are moving to Vulkan i hope they know what they are doing.
     
  14. kunos

    kunos Alien

    in this case we're not talking about Vulkan in general but about the Vulkan integration in UE4.. which is a completely different topic.
    Hopefully UE4 4.20 will be out soon and although there are no specific Vulkan on PC mentions we'll surely check it out to see if we can get it to work with ACC.

    EDIT:
    Actually just read this in the UE4 forum.. which is promising :) :
    "Vulkan is significantly improved in 4.20 and has equal or better performance than DX11, they just didn't mention it in the summary."

    Also some interesting stuff for ISR which could be good news for VR.. so yeah, looks like a good engine update for ACC.
     
    Last edited: Jul 14, 2018
  15. BrunUK

    BrunUK Alien

  16. Serge M

    Serge M Alien

    All of this sounds awesome. Anything that makes the PC workload easier to run VR is very welcome as it means I’ll be able to crank the settings up :)
     
  17. Gotta say - as someone who works in software dev [3d engineering software], I enjoy seeing the 'views from the inside'. Keep em coming :)

    Last week I showed one of our lead R&D devs the Misano wet video, along with the day/night transition video and there was some serious geeking out over it for a bit. A "Kunos Engineering Blog" would have some serious fans down in New Zealand ! Just saying ;)
     
  18. Typer

    Typer Simracer

    Oh, exciting stuff on the VR front, thanks for letting us know.

    Also very encouraging to hear that you’re looking to update UE in general. Is that an ongoing plan, to keep ACC up-to-date with UE minor versions while ACC is in development? Have you done many updates so far, and if so, how much work has it been? Thanks.
     
  19. Andrew_WOT

    Andrew_WOT Alien

    Stefano posted some interesting tidbit here http://www.assettocorsa.net/forum/index.php?threads/discuss-rfactor2.36890/page-90#post-981171
    @Lord Kunos, does that mean that FFB refresh rate is 111Hz, or it's unrelated.
     
  20. kunos

    kunos Alien

    Andrew_WOT likes this.
Similar Threads
Forum Title Date
Physics modding - Cars & Tyres Suspension editor & physics/graphic differences Oct 30, 2017
Chit Chat Room Gt car lap time/physics differences Feb 13, 2015
ACC Physics Help Understading new physics Today at 12:50 AM
ACC PS4 - XB1 General Discussions ACC physics and depth of simulation discussion Aug 2, 2020
ACC PS4 - XB1 General Discussions Odd Physics Jul 31, 2020
ACC Multiplayer Server Driver Swap Disconnects - LogKsPhysics: SPLINE RECALC TRIGGERED WITH: 28242.5 Jun 27, 2020
ACC Physics Nissan GTR collision physics May 24, 2020
ACC Physics ACC Activation-Deactivation of physics recording channels. May 11, 2020
ACC Graphics - Tracks and Cars Let’s talk about netcode and/or physics in Broadcast Events Mar 30, 2020
ACC Physics Low-speed physics and antistall/throttle cut behaviour Feb 3, 2020
ACC Screenshots & Videos Great visual of ACC's physics in real time... Jan 25, 2020
ACC Physics Tire physics Dec 25, 2019
ACC Physics Physics of ACC cars in AC Nov 19, 2019
ACC Physics Problem with physics on rain lamborghini huracan Nov 2, 2019
Physics Bugs & Issues Compare Physics of 2 Cars Oct 21, 2019

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice