How to boost your Doom3 performance by 40% on ATI hardware

Discussion in 'PC Gaming' started by Humus, Aug 8, 2004.

  1. davea

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    erm wow. 9800 pro pulling 6x AA 16X AF forced via radlinker:

    http://img69.exs.cx/img69/9826/shot32.jpg
    http://img69.exs.cx/img69/6413/shot33.jpg
    http://img69.exs.cx/img69/8638/shot34.jpg
    http://img69.exs.cx/img69/6360/shot35.jpg
    http://img69.exs.cx/img69/7164/shot36.jpg
    http://img69.exs.cx/img69/9060/shot37.jpg

    does that look like 6x aa and 16x af to you?

    btw i get some tiny artifacts here and there but they arent showing up in screenshots. my card should not get artifacts at 440core 355 mem. its capable of 450 core 380 mem.

    http://img17.exs.cx/img17/7833/doomsettings.jpg
     
  2. Ruined

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    Question, if this was approved by id/Carmack and implemented in the next Doom3 patch, would it require a seperate special ATI path since it negatively impacts performance on non-ATI cards? i.e. NV30/NV40 would run ARB2 and 9800/X800 a special ATI path?

    If so, is that in line with what Carmack wanted for the engine? (i.e. was having all modern graphics cards running the ARB2 path more in line with his vision?)

    I'm pretty surprised Carmack was able to make the game without seperate paths, considering every big game these days has different paths for nv/ati.
     
  3. Star_Hunter

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    I would have to say that yes he would do a seperate path for Ati then...although the only difference would be this tweak.
     
  4. Ruined

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    Someone on NVNEWS posted that they lost fps on the 6800GT as well with this change... Seems it only benefits ATI R3XX/R4XX cards, and is detrimental to other cards.
     
  5. Reverend

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    davea (and everyone else), please don't do that again. It's annoying as hell. Just like these huge fonts of mine are annoying.

    If you want to post multiple images in your post, provide URL. In fact, whenever possible, if you want folks to look at your images, provide URL if you have a web space.

    Thank you.
     
  6. Humus

    Humus Crazy coder
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    I've tuned it a bit more to try to get exactly the same output as the original shader, and come to the conclusion that this is pretty darn close even when comparing screenshots.

    Code:
    MAD_SAT R1, specular, 5.0, -4.0;
    
    So I've put that into the tweak file:
    http://esprit.campus.luth.se/~humus/temp/doom3PerformanceTweak.rar

    Comparison shots:

    With tweak:
    http://esprit.campus.luth.se/~humus/temp/shot00017.jpg
    Without tweak:
    http://esprit.campus.luth.se/~humus/temp/shot00018.jpg

    High-res .png files (1MB+):
    http://esprit.campus.luth.se/~humus/temp/shot00017.png
    http://esprit.campus.luth.se/~humus/temp/shot00018.png
     
  7. DarN

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    Well, the thread title says "on ATI hardware"........ No wonder then, huh?
     
  8. Ruined

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    ? Did you read my original post? Scroll up, I was replying to someone.
     
  9. Ruined

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    Seems darker with the tweak. Check out the middle of the door on the right and the dark panel above it, or the blue triangle thingies in the middle of the screen. Also less shine off the aluminum above and to the right of the blue triangle thiniges with the tweak.
     
  10. Star_Hunter

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    Humus is this newer then the one you posted a rage3d a little bit ago or is it the same one?
     
  11. DarN

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  12. RockShocker

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    I think that's just because the flashlight is not exactly in the same spot as it was in the first screenshot. Awesome tweak, I'm going to benchmark the new settings now.
     
  13. Humus

    Humus Crazy coder
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    I've toggled between the two with dds view back and forth and the only difference I see is because the light moved slightly between the two images. I now even computed the picture difference in paint shop pro, and the pixel difference is zero for most of the image, and below 5 for pretty much everything except around the flashlight and the light cone, but then the light moved a bit so that explains that.
     
  14. Humus

    Humus Crazy coder
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    LOL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1111oneone!!1 :lol:
     
  15. Humus

    Humus Crazy coder
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    It's newer. Same link, but newer file.
     
  16. Ruined

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    I noticed the flashlight moved, but even so, the flashlight is more focused on the blue area and aluminum surrounding it in the tweak picture, but it is overall less bright for the entire flashlight cone and has less shine on the metal that the flashlight is focusing on compared to the non-tweak image.

    The difference in the flashlight intensity is made apparent by tabbing between the low res pics, while you can see the shine differences easier in the high res pics.
     
  17. Star_Hunter

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    Couldn't you get 2 exact screenshots by loading a map, teleport, and then take the images without moving the mouse? (that is if there is a teleport command in doom 3...)
     
  18. RockShocker

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    I get no change in performance, but it does look better, the weapons don't look like they are too bright anymore as they did for me with the previous settings, they now look normal.
     
  19. Reverend

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    I just received the longest email I have ever received from JC, regarding this topic raised by Humus.

    Unfortunately, for the last 3 hours, I have spent a considerable amount of time doing stuff like Humus has done, i.e. messing with Doom3 codes... and I usually work best while continously consuming beer! And that means 6 cans in 3 hours... past my sober-limit, which means I really would like to sleep!!!

    I don't know if I should spend some time posting a new topic that mentions/explains what Humus is doing while providing my own thoughts on this as a result of my correspondences with JC (wrt to what Humus is doing, of course)... or I should just be lazy and post the email I got from JC.

    I'll sleep on it, which will happen in about, oh, half an hour's time! :)
     
  20. davea

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