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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. John Regehr‏ @johnregehr Mar 20

      commercial real-time raytracing https://devblogs.nvidia.com/introduction-nvidia-rtx-directx-raytracing/ … hey @Peter_shirley did this happen before or after you predicted it would?

      2 replies 2 retweets 4 likes
    2. Patrick Walton‏ @pcwalton Mar 20
      Replying to @johnregehr @Peter_shirley

      The trajectory of real-time raytracing kind of mirrors is a microcosm of CS: by the time we got it, the traditional rasterization approaches got so good that raytracing seems hardly worth the trouble

      4 replies 2 retweets 9 likes
    3. Rich Felker‏ @RichFelker Mar 20
      Replying to @pcwalton @johnregehr @Peter_shirley

      Except they didn't. Anything to do with indirect lighting and shadows in them is all hacks that glitch hideously.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker Mar 20
      Replying to @RichFelker @pcwalton and

      Anyway forget normal (reverse) raytracing; of course it's trivially parallelizable down to a per-pixel level. I want to see forward (projecting photons) raytracing.

      11:25 AM - 20 Mar 2018
      • 2 Likes
      • Peter Shirley John Regehr
      2 replies 0 retweets 2 likes
        1. New conversation
        2. Patrick Walton‏ @pcwalton Mar 20
          Replying to @RichFelker @johnregehr @Peter_shirley

          Well, the problem is that raytracing is trivially parallelizable in theory, but the memory locality is horrendous without being very smart about data layout. This killed all the early attempts to do raytracing on GPU, AIUI.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker Mar 20
          Replying to @pcwalton @johnregehr @Peter_shirley

          GPU is probably not a good model. You want millions of tiny CPU-like cores. GPU vendors just try to make it into a GPU problem.

          2 replies 0 retweets 2 likes
        4. John Regehr‏ @johnregehr Mar 20
          Replying to @RichFelker @pcwalton @Peter_shirley

          but unless the millions of tiny cores are good at other things too, a GPU that is only ok for raytracing but that does lots of other jobs will be the thing that I want

          2 replies 0 retweets 2 likes
        5. Rich Felker‏ @RichFelker Mar 20
          Replying to @johnregehr @pcwalton @Peter_shirley

          Well the "millions of tiny cores, purely for raytracing" might very well make sense in a VR or AR unit.

          0 replies 0 retweets 1 like
        6. End of conversation
        1. Rich Felker‏ @RichFelker Mar 20
          Replying to @RichFelker @pcwalton and

          BTW any idea how much computation/how many rays you need to make something minimally interesting like this? E.g. 320x240 and "very high ISO sensor"?

          0 replies 0 retweets 0 likes
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