John CarmackVerified account

@ID_AA_Carmack

Oculus VR CTO

Dallas, TX
oculus.com
Joined August 2010
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  1. 1 hour ago

    Oculus Connect 5: I will be doing me my usual live app reviews and unscripted keynote on day 2.

    Preview: First 18 Talks Revealed, Registration Now Open to Attend September 26 – 27 in San Jose //
    4 replies 7 retweets 68 likes
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  2. Retweeted
    22 hours ago

    Graphics engineers! Anyone looking for a new job? The GPU team @ Pixar is looking for a graphics engineer to help us build the future of Hydra, USD, OpenSubdiv & more. We’ll be at , feel free to reach out if you’re curious

    7 replies 111 retweets 168 likes
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  3. Jul 30

    Music recommendation is a case where you really do want to overfit your training data, even at the expense of generality -- every single manually marked favorite should be in the play list, even if the sample seems bizarrely out of place.

    17 replies 33 retweets 285 likes
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  4. Jul 29

    When doing exploratory research, there is a tension around optimization. Let it run for a couple hours, our optimize it to speed up the runtime and increase experiment count, at the expense of increasing the chance that there is an implementation error.

    12 replies 20 retweets 122 likes
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  5. Jul 27

    I can always use software OPUS, but it is a little unfortunate.

    1 reply 1 retweet 8 likes
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  6. Jul 27

    Anyone know how to get an Android audio/mp4a-latm MediaCodec to use 960 sample packets instead of 1024?

    22 replies 2 retweets 36 likes
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  7. Jul 26

    It would be interesting to have some kind of massive corpus statistics on color distribution to pick the best range for chroma-key transparency for video.

    21 replies 2 retweets 84 likes
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  8. Jul 25

    You might be marked down for it on an exam, but not explicitly cleaning up many classes of resources and just exiting the process to let the OS do it is often completely reasonable, and the high performance thing to do. Apps that don't exit instantly get a glare.

    58 replies 165 retweets 1,010 likes
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  9. Jul 24

    Nothing but good things to say about Tim!

    Of all the people to suddenly find themselves a billionaire I'm going to say Tim Sweeney is among the nicest
    9 replies 25 retweets 329 likes
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  10. Jul 24

    Lately I have been writing a lot of "isolationist code", where I avoid all utility and convenience functions that might be available outside system libraries. Somewhat bulkier, but rather pleasant.

    39 replies 37 retweets 494 likes
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  11. Jul 23

    This applies in games -- trading off a high advance for a high royalty because you are confident you are going to sell well may leave the publisher with an argument to instead promote a similar title that they have less royalty cost on. A high advance motivates them!

    (A small advance can be better—it’s easier to earn out—but publishers may invest more resources in book deals with bigger advances. Neither is necessarily better or worse, except in the potential of long-term industry longevity. But that’s a conversation for another day.)
    Show this thread
    4 replies 35 retweets 161 likes
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  12. Jul 22

    While I vigorously defend the right to work harder than most people think is reasonable, this *IS* a great point.

    This is a great point. Netflix’s “chaos monkey” is a service that deliberately (&temporarily) kills other key services — to exercise fault tolerance in their systems. Applying that to people, if your biz would be damaged by one person’s absence, you should really know that.
    11 replies 54 retweets 284 likes
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  13. Jul 22

    I had a great time with my family at the North Texas Comic Book Show today — we came back with a pile of comics and toys, and something from almost all of the attending artists.

    2 replies 4 retweets 104 likes
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  14. Jul 21

    Having visited Dubai is the only thing that gives me perspective on the Dallas heat now — 109 today.

    16 replies 9 retweets 136 likes
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  15. Jul 20

    When shooting 180 VR, try to make your scene composition "V shaped", with the closer objects in the center, otherwise vertical disparity on nearby objects off to the sides will be uncomfortable.

    5 replies 21 retweets 134 likes
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  16. Jul 19

    I like that! It is probably a good time for some soul searching if you find you are engineering "bulletproof shoes" to combat shooting yourself in the foot.

    Replying to @ID_AA_Carmack
    That is just an opportunity to make bulletproof shoes
    20 replies 30 retweets 164 likes
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  17. Jul 19

    I try to keep a positive attitude -- I cheer when we don't pull the trigger after carefully aiming at our foot.

    9 replies 67 retweets 464 likes
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  18. Jul 18

    Every year now, I wistfully think about how fun it would be to just show up at with some brand new 8 bit code. I know I don't have time to do a real project, but maybe just a demo...

    27 replies 19 retweets 269 likes
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  19. Jul 17

    Many of Rich's observations in the surrounding hundred+ tweets seem overly cynical (granted, my viewpoint would be conductive to naivete), but early Id Software days of massive bonuses did cause some pathologies that even socially-oblivious-me could notice.

    I do think they can work much better without the bonus incentive distorting everything. Also, as an external dev interacting with a self-organizing company I’ve had very good experiences.
    Show this thread
    11 replies 11 retweets 115 likes
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  20. Jul 16

    Heard a rule of thumb today: 100 mW of power per GB/s of main memory traffic in a modern SoC. That seems plausible, but does anyone have pointers to surveys of measured data?

    8 replies 9 retweets 50 likes
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