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Author Topic: Very hot Mandelbulb  (Read 3685 times)
Description: Mandelbulb with glow efect based on DE steps count
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Buddhi
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« on: January 01, 2010, 09:40:53 PM »

I'm testing now very simple method to add very nice glow to Mandelbulbs. This glow is completely for free because I use number of distance estimation steps. Pixel where ray goes nearly parallel to fractal surface needs much more steps to find fractal boundary (DE steps are smaller). When I set glow colour to red/yellow it looks like fire or very hot surfaces.

Below there are two renderings with this glow effect


http://www.fractalforums.com/gallery/?sa=view;id=1240


http://www.fractalforums.com/gallery/?sa=view;id=1255
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bib
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« Reply #1 on: January 01, 2010, 09:51:11 PM »

hot!! cheesy
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Between order and disorder reigns a delicious moment. (Paul ValÚry)
cKleinhuis
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« Reply #2 on: January 01, 2010, 10:38:10 PM »

wow, cool effect cheesy
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twinbee
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« Reply #3 on: January 02, 2010, 07:53:26 AM »

Lovely. I think I saw a small glow render of yours earlier too. Like to see you do something with that.
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cbuchner1
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« Reply #4 on: January 02, 2010, 05:24:22 PM »


Can you describe to us how you achieve the glow effect? This is very interesting, I would love to replicate that.
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Buddhi
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« Reply #5 on: January 02, 2010, 06:32:55 PM »

Can you describe to us how you achieve the glow effect? This is very interesting, I would love to replicate that.

It is very simple when you are using Distance Estimation. You only have to count how many steps you need to find fractal surface or left rendering area. Glow intensity will be higher near fractal boundary because steps for finding fractal surface will be smaller and program has to calculate more steps. On attached drawing I tried to illustrate this effect. When you have number of steps you can use this value to make pixels brighter proportional to this value. But remember. It works only when program uses not constant steps but proportional to estimated distance. This glow effect don't make rendering slower because it needs only one simple counter.


* DE steps.png (28.12 KB, 438x443 - viewed 1157 times.)
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KRAFTWERK
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« Reply #6 on: January 04, 2010, 04:07:23 PM »

Nice!

It┤s -10 ░C outside, this warms me!

J
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