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Author Topic: global illumination (article)  (Read 2013 times)
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willvarfar
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Posts: 57


« on: October 07, 2012, 04:02:36 PM »

http://www.iquilezles.org/www/articles/simplepathtracing/simplepathtracing.htm
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eiffie
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« Reply #1 on: October 09, 2012, 04:49:21 PM »

Thanks for posting. I hadn't checked to see what IQ was up to for a while and now I have a lesson from the master!

I put the code in the article together and made a Fragmentarium script out of it. (see attached)
I tried to keep it as simple as possible so others can add to it.


* iqPath.jpg (33.32 KB, 520x412 - viewed 1604 times.)
* iqPath4fragmentarium.frag (5.2 KB - downloaded 222 times.)
« Last Edit: November 15, 2012, 05:33:48 PM by eiffie, Reason: adding attachments » Logged
Kali
Fractal Supremo
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« Reply #2 on: November 15, 2012, 06:56:21 PM »

Excelent, thanks for sharing!
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richardrosenman
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« Reply #3 on: November 22, 2012, 09:55:25 PM »

Hi eiffie;

Thank you for posting this code! It's awesome!

Is it tough to extend this to the Mandelbulb or other fractals? I played around with it but removing any single object seems to break down most of the script.

-Rich
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eiffie
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« Reply #4 on: November 24, 2012, 06:00:02 PM »

Hi Rich I should have posted a link here to another thread where I have updated the code...
http://www.fractalforums.com/fragmentarium/inigo-quilez's-brute-force-global-illumination/

The last code posted shows a bit better how to add fractals. Actually it has a bulb now as a LIGHT!

I am still puttering with it so expect at least one more update. I think it can be made faster.
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tryptophan
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Posts: 86


« Reply #5 on: April 05, 2013, 08:38:30 PM »

I am stoked to check this out thanks for sharing.
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eiffie
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« Reply #6 on: April 06, 2013, 05:28:14 PM »

If you are looking at my code make sure you check the code in the thread mentioned above.
There are a couple of obvious areas for improvement - I didn't handle shadows of reflective objects correctly and the shadows are colored?!?!?
I also didn't use Schlick's approx for determining diffuse vs spec lighting although I remember adding a fake in one version.

I also made an unbiased version (that doesn't cheat toward finding light). It handles fractal lighting well but unfortunately takes FOREVER!
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