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Better quality LODS and shadows!

Discussion in 'Chit Chat Room' started by Chazz Ranger, Jan 30, 2016.

  1. Chazz Ranger

    Chazz Ranger Alien

    I can't overemphasis the difference this has made in the LOD and shadow quality of my AC. Thanks to some investigative work by forum member matt2380 and his shadow map settings outlined in this post: Anybody know how to tweak shadow quality?

    AssettoCorsa/system/cfg/graphics.ini
    SHADOW_MAP_BIAS_0=0.0000000001
    SHADOW_MAP_BIAS_1=0.0000000001
    SHADOW_MAP_BIAS_2=0.0000000001

    To quote matt2380 and my own post on that thread...
    - Removes the ugly transitions between shadow maps and increases detail of distant shadows... which nearly completely negates that funny "chasing shadow" effect on guardrails and walls.
    - Fully removes the gaps between objects and their shadows (very noticeable on guardrails and walls).
    - Has no FPS impact (for me at least)... in fact, replays seem to be far more smooth now, partly because...
    - *GETS RID OF THE ANNOYING COCKPIT SHADOW LOD CHANGE* In fact, I can't see LOD switches in replays at all now.
    - Improves shadow quality overall, and with a few exceptions just make shadows look "right".

    I have yet to find something game-breaking with these settings. The cost for all this is so minimal, you'd be insane not to try them. As I said in my post, you still need AA (preferably SGSS) to reduce pixel crawl and shadow flicker, these settings aren't perfect and they don't FIX shadows, but they make one hell of an improvement. I still see the occasional flickering jaggie shadow on cars, signs, etc. but WOW. My AC has never looked better. The reduction of annoying cockpit shadow/LOD switches alone is worth it.
     
    Milincho, jasjeet, matt2380 and 8 others like this.

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  3. F430_458_F12

    F430_458_F12 Alien

    Just how much of an FPS loss is there?
     
  4. mtlclutch

    mtlclutch Gamer

    hmmm.. something i always hoped would be fixed. Def giving it a try right now.
     
  5. Ben Lee

    Ben Lee Alien

    Does it increase draw distance of the shadows?
     
    F430_458_F12 likes this.
  6. mtlclutch

    mtlclutch Gamer

    Just finished a nurb run with the changed settings. The LOD is definitely not swapping on the car. Im almost certain the shadows have much better draw distances now but my pc isnt the greatest so it could be sharper. FPS impact minimal to none but I was solo on my run.
    http://imgur.com/zU3R5Xl
    [​IMG]
     
    Last edited: Jan 30, 2016
    F430_458_F12 likes this.
  7. andrea_gi

    andrea_gi Alien

    nope

    first:

    this trick have a conseguence BTW the car shadow with very low FOV cameras during replays

    here an exemple with stock lod 3 values this is the result (look at the bumper)

    Showroom_mercedes_sls_gt3_30-0-2016-9-25-34.jpg


    with pumped lod 3 values

    Showroom_mercedes_sls_gt3_30-0-2016-9-24-45.jpg
     
    F430_458_F12 likes this.
  8. mtlclutch

    mtlclutch Gamer

    maxed out the settings in ac and shadows still popping in at long range
     
  9. andrea_gi

    andrea_gi Alien

    it's a directx 11 issue PJC have the same issue...can't be fixed
     
  10. mtlclutch

    mtlclutch Gamer

    ok thanks for crushing my dreams :p Can i just delete the graphics folder to reset back to default? I didnt backup :eek::eek::eek:
     
  11. andrea_gi

    andrea_gi Alien

    just set
    000002
    000015
    00003
     
    F430_458_F12 likes this.
  12. andrea_gi

    andrea_gi Alien

    BTW FOR DRIVING IS BETTER USE PUMPED SETTINGS
     
  13. Ben Lee

    Ben Lee Alien

    I still struggle to understand why there isn't a variable for the shadow distance. Surely there must be a value for it somewhere?
     
    Last edited: Jan 30, 2016
  14. andrea_gi

    andrea_gi Alien

    Directx limit

    Inviato dal mio LG-D855 utilizzando Tapatalk
     
  15. Filippo94

    Filippo94 Alien

    it's not Directx limit :rolleyes:
    Shadow distance can be set usually during programming, but it is not free. Further shadow distance will cause general pixel density decrease.
     
    F430_458_F12 likes this.
  16. Chazz Ranger

    Chazz Ranger Alien

    Agreed, one drawback I have noticed is car shadows tend to be overall more striped/pixelated with these settings. But I'm willing to trade that for the rest of the benefits (we'll see how long that lasts before the car shadow striping drives me nuts lol) :D
     
  17. Kristaps

    Kristaps Alien

    Highly recommend this shadow fix/workaround!
    Surprisingly zero fps hit on my weak *** outdated gtx570, I am using 'high setting' for shadows.
    Thx @Chazz Ranger
     
    F430_458_F12 likes this.
  18. Filippo94

    Filippo94 Alien

    A drawback that you should be aware of is that on the edge tangent to the light direction you'll start seeing artefacts, because lowering the bias basically reduces the offset of the shadow from the shadow caster.
     
    Blamer likes this.
  19. Kristaps

    Kristaps Alien

    Yes, there are some drawbacks, but much less noticeable compared to that annoying LOD's popping
     
  20. Filippo94

    Filippo94 Alien

    It depends, Popping lods happen always in far distances, shadows artefacts are everywhere instead. It's one of the countless compromises you as a graphics developer have to choose between.
     
    Patrik Marek and Blamer like this.
  21. Chazz Ranger

    Chazz Ranger Alien

    No worries! But thank matt2380, he did all the work, I'm just the messenger! :D
     
    Kristaps likes this.

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