Title: Very hot Mandelbulb Post by: Buddhi 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/1/640_30_12_09_9_32_32.jpg) http://www.fractalforums.com/gallery/?sa=view;id=1240 (http://www.fractalforums.com/gallery/1/640_01_01_10_9_28_13.jpg) http://www.fractalforums.com/gallery/?sa=view;id=1255 Title: Re: Very hot Mandelbulb Post by: bib on January 01, 2010, 09:51:11 PM hot!! :D
Title: Re: Very hot Mandelbulb Post by: cKleinhuis on January 01, 2010, 10:38:10 PM wow, cool effect :D
Title: Re: Very hot Mandelbulb Post by: twinbee 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.
Title: Re: Very hot Mandelbulb Post by: cbuchner1 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. Title: Re: Very hot Mandelbulb Post by: Buddhi 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. Title: Re: Very hot Mandelbulb Post by: KRAFTWERK on January 04, 2010, 04:07:23 PM Nice! Itīs -10 °C outside, this warms me! J |