4 ms·

Quaternion julia sets look pretty neat.

• Sharlin 9y ago
  Especially when animated by varying over time the 3D hyperplane on which the object is projected. POV-Ray, the venerable open-source raytracer, has had a 4D Julia primitive for ages and with current processors is a pretty good way to explore the Julia space. But the 4D versions don't exhibit the sort of dizzying complexity you can endlessly zoom into like the original Mandelbrot/Julia set. This is mentioned by the starter of the thread.
  • andreareina 9y ago
    Oh wow, POV-Ray was finally open-sourced. I remember playing around with it maybe 15 years ago now. The Internet Ray Tracing Competition[1] was still a going concern, and one of the rules was that post-processing was disallowed. So people got motion blur by recompiling the program to average several frames together, which didn't count as post-processing since it was still a ray-tracer that did it. [1] https://en.wikipedia.org/wiki/Internet_Ray_Tracing_Competition https://en.wikipedia.org/wiki/Internet_Ray_Tracing_Competiti...
    • Sharlin 9y ago
      Wasn't the source "always" available but just under a custom non-FOSS compatible license? I used to use POV-Ray quite a bit and participated in the IRTC a few times as well. Even 15 years ago the reason for keeping the legacy license was IIRC mostly that it would have been a huge task to get in touch with all the contributors or alternatively to rewrite all the parts that could not have been relicensed.
      • andreareina 9y ago
        Yeah the source was available for as long as I used it (hence people being able to hack on it for the motion blur), but always under the no-redistribution license. I wasn't yet very familiar with FOSS but I remember understanding that the source being available was a big deal, and the no-redistribution clause was also a big deal.