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Author Topic: Bad Memories  (Read 556 times)
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Kali
Fractal Supremo
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« on: December 30, 2012, 12:00:18 AM »

Bad Memories



http://www.fractalforums.com/index.php?action=gallery;sa=view;id=13070


Fragmentarium - Kalibox

Volumetric lighting raytracer mod - raw render, no postwork

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cKleinhuis
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formerly known as 'Trifox'


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« Reply #1 on: December 30, 2012, 12:13:40 AM »

is this the mandelX implementation ? nice!!!
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divide and conquer - iterate and rule - chaos is No random!
Kali
Fractal Supremo
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Posts: 1138


« Reply #2 on: December 30, 2012, 05:53:28 AM »

No Chris, is my Mandelbox mod (Kalibox) - Just to show the volumetric lighting... I'll try to do the MandelX 3D when I return home, but using bruteforce I think, I'm not so good at finding DE fˇrmulas...
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subblue
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« Reply #3 on: December 30, 2012, 11:34:04 AM »

Very nice. The volumetric lighting must be expensive. Are you taking uniform steps and then doing a shadow test for each to build it?
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Syntopia
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« Reply #4 on: December 30, 2012, 04:00:23 PM »

Looks great, Kali!
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Kali
Fractal Supremo
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Posts: 1138


« Reply #5 on: December 30, 2012, 06:32:04 PM »

Thanks subblue & Syntopia!

Very nice. The volumetric lighting must be expensive. Are you taking uniform steps and then doing a shadow test for each to build it?

Exactly  smiley  - Couldn't find any good optimization yet (I can think of some but none applicable to a pixel shader) - At least I use big uniform steps, then jitter the coords and use progressive rendering, so I can navigate the fractal to find the scene and then let it render. I made another version where the shadow test is made on each raystep of the DE tracing, then scaling down the raysteps a bit and doing heavy dithering... the results are acceptable but not so faster anyway.
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knighty
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« Reply #6 on: December 30, 2012, 08:24:15 PM »

This is too good for bad memories.  smiley

As for volumetric shadows there are some papers about the subject (for those who are interseted):
http://groups.csail.mit.edu/graphics/mmvs/
http://groups.csail.mit.edu/graphics/volumeshadows/
http://www.sfb716.uni-stuttgart.de/uploads/tx_vispublications/espmss10.pdf
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Kali
Fractal Supremo
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Posts: 1138


« Reply #7 on: December 30, 2012, 09:12:34 PM »

This is too good for bad memories.  smiley

Thanks knighty smiley - As I'm not very imaginative with titles, I decided to put the first thing that came to my mind after seeing the image. And for my surprise I recalled something bad in my life, nothing terrible but an unpleasant thought... pretty weird how the mind works sometimes (specially mine  grin)

Also thanks for the info!
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