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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 14 Jan 2018
    • Report Tweet
    • Report NetzDG Violation

    Tim Sweeney Retweeted David Amador  🐙

    Sorry y’all I was young and this coordinate system stuff was confusinghttps://twitter.com/dj_link/status/952185276218200065 …

    Tim Sweeney added,

    David Amador  🐙 @DJ_Link
    a real gamedev struggle here pic.twitter.com/k63JFYlope
    Show this thread
    1:59 PM - 14 Jan 2018
    • 601 Retweets
    • 2,337 Likes
    • Thiago Guardado Beltran Ian Dewancker Joshua Kuntz Merlijn (Aka Syraleaf) (((🤖))) Alexey Mak (Tom) JustAnAverageTree Styg Angus B. Grieve-Smith
    64 replies 601 retweets 2,337 likes
      1. New conversation
      2. inigo quilez‏ @iquilezles 14 Jan 2018
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        Replying to @TimSweeneyEpic

        I want X up (and Z right, and Y backward). Because there are 48 possibilities and they all equal and deserve same love.

        3 replies 1 retweet 58 likes
      3. Aras Pranckevičius‏ @aras_p 14 Jan 2018
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        Replying to @iquilezles @TimSweeneyEpic

        X up, Y forward but titled down 30 degrees, Z left but in imperial units

        3 replies 3 retweets 67 likes
      4. 4 more replies
      1. New conversation
      2. John McDonald‏ @basisspace 14 Jan 2018
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        Replying to @TimSweeneyEpic

        z-up has the great property that many games are basically 2.5D and so you can trivially cast your 3D coordinate to 2D and do game-math with them that makes sense. The bigger "huh" is left-handed. +X forward and +Y to the right always feels weird.

        3 replies 0 retweets 14 likes
      3. Cass Everitt‏ @casseveritt 14 Jan 2018
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        Replying to @basisspace @TimSweeneyEpic

        I think @ID_AA_Carmack said level design started out as XY like a blueprint / floor plan, which makes Z up natural for level coordinates. Left / right handed is usually just an early arbitrary choice, eg. image space w/ upper left origin and +Y goes down.

        1 reply 0 retweets 16 likes
      4. 3 more replies
      1. New conversation
      2. Henrik ”Social Distance” Jonsson‏ @IonSwitz 7 Dec 2019
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        Replying to @TimSweeneyEpic @ChrisDeLeon

        I worked 3 years in Frostbite, and having used every conceivable coordinate systems in games (including “lower-left corner as origin” in 2D games - memory mapped Targa gfx card), I can’t remember what Frostbite users It really doesn’t matter, as long as the axis are orthogonal?

        0 replies 0 retweets 0 likes
      3. 4 more replies
      1. New conversation
      2. Tom Forsyth‏ @tom_forsyth 14 Jan 2018
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        Replying to @TimSweeneyEpic

        Nothing wrong with Z=up. One of those things that at first glance looks insane, then you explain it to people, and it's actually quite sensible.

        7 replies 0 retweets 25 likes
      3. Eric Lengyel‏ @EricLengyel 14 Jan 2018
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        Replying to @tom_forsyth @TimSweeneyEpic

        These kinds of diagrams always fail to make a distinction between camera space and world space, and it makes my blood boil. Z-up makes waaaay more sense in world space, and Y-up makes sense in camera space or screen space.

        2 replies 2 retweets 36 likes
      4. 4 more replies
      1. Michael Shilliday  ☕️‏ @HawtKoffee 14 Jan 2018
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        Replying to @TimSweeneyEpic @MekuCube

        THIS IS STRICTLY A "Z IS UP" TWITTER FEEDpic.twitter.com/6fRR48rlqA

        0 replies 2 retweets 18 likes
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      1. Freya Holmér‏ @FreyaHolmer 14 Jan 2018
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        Replying to @TimSweeneyEpic

        I look up to the sky and ask - Y?

        0 replies 0 retweets 24 likes
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