Comment by mm_alex

done! paste this [1] into shadertoy (and I de-lurked on HN after 3 years to do this; who knew) nice effect, but it pains me that a multicore cpu implementation can be SO SLOW. modern pc's are fast, you know? not just the gpu... oh well.

[1] https://gist.github.com/f448ba84e94c61ab5924