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WebGL Julia Set (jonathan-potter.github.io)
70 points by roombarampage on July 19, 2016 | hide | past | favorite | 22 comments

This project was built using code I wrote previously for this pure javascript fractal renderer: http://jonathan-potter.github.io/Mandelbrot/

Jamie Wong's post on hacker news earlier this week was a massive help in allowing me to switch to using WebGL for the rendering portion. His post can be found here: http://jamie-wong.com/2016/07/06/metaballs-and-webgl/

That's funny. I spent the weekend making a Mandelbrot set renderer using the same tutorial:


It needs a little refactoring, and probably only works in Chrome.

very cool :) that tutorial was very helpful

Nothing showing up on iOS. Is it missing some extensions?

mobile was working earlier... not sure what is going on. looking into it now. works on desktop though >_<

I got mobile fixed on my ios devices. I don't really have the tools for testing android at home. anyone want to confirm for me?

No luck on android 5.1.0 with Chrome 47.0.2526.83 for me, just a black screen. No errors in the console either. Sorry I can't give you a more helpful description.

edit: that's for the submitted link, http://jonathan-potter.github.io/Mandelbrot/ works fine.

Also works fine on Android 4.3 with the latest Chrome version.

Works fine on iOS 10/Safari

Blank screen on Android as well

If you zoom in, then the oscillations get amplified and it because rather difficult to see anything.

There are a lot of noisy visual artifacts over time. Seems like just one sample per pixel?

You also may want to look at https://linas.org/art-gallery/escape/smooth.html

Complex numbers offer an orthogonal dimension to the integer number line , where multiplication aquires a rotational element. This allows intermediate 90° (π/2) multiplication and Julia's Set is shown to be a map to Madelbrot's Fractal. https://acko.net/blog/how-to-fold-a-julia-fractal/

Also the fourier transform is much more obvious in the imaginary plane. https://acko.net/tv/toolsforthought/

That the Julia set and the Mandelbrot set are covariant maps on the 2D complex plane hints at the higher dimensional shape that surface Z^x + c = 0 describes.

I like fractal renderers, I made one in Haskell[1] once. In only 41 lines of code (23 if you strip white lines and type sigs). It also makes a post of its output combined with the code[3]; warning 18MB PDF (sorry Github).

[1] https://github.com/cies/haskell-fractal

[2] https://github.com/cies/haskell-fractal/blob/master/fractal....

[3] https://github.com/cies/haskell-fractal/blob/master/poster.p...

I made one in one line of python:

for a in range(900):print"\n.x"[(a%30>0)+(abs(reduce(lambda z,c:zz+c,[a%30.1-2+1j(a/30.1-1.5)]*30))<2)],

For a code golf on stackoverflow

I like this a lot! Well done. Some * symbols for eaten by HN though, you can put spaces around them.

You should add a stop button for the animation, and also fix the back button. Using URL fragments for this is ridiculous.

I like the stop button idea, but there are some considerations that I need to work through before I can add it in.

the intention behind using the url hash for application state is to allow sections to be debugged and sent as links. that said, I may rip it out in place of a smooth zoom when I get time.

Looking at it moving for more than 3 seconds made me quite nauseous if I zoomed in.

You could adjust the URL hash without pushing the change onto the history stack -- that gets you the best of both worlds.

Looks like this has been implemented now, but I can't find any way to zoom back out!

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