updating of DE-Raytracer

[3dickulus]

mmmmmm yum yum shadey shaders, very nice to see some activity on this front   you guys continue to amaze!

[mclarekin]

Like Knightys God rays shining down.

Some what similar to fogs and cloud. On my wish list is "blocks of fog" that can be positioned in various places within the image. With colour, shape, rotation and density controls and edge thinning.

The ultimate would be wisps, but that might be a bit difficult.

Placement of localised fog would be nice in some still images BUT in animation having fog forming and/or moving would be really cool.

I imagine moving ground fog (groundfog day, lol), fog parting as you zoom in, a ring of fog placed half way up a fractal tower, fog appearing in the shape of a pyramid with an internal light then it spins out of view, wispy fog crossing the moon, the sun rising above a fog layer, fog primitive shapes joined to construct a giant Bart Simpson, tubes of coloured fog, fog visualisation of the animation spline, a coloured fog rainbow etc .   Ahhh,  my imagination is only limited by current my inability. 

But just a single movable block of fog would be interesting.

And then there are spotlights, lasers and particle beams 

[eiffie]

Not to complicate things for knighty but it would be cool (and his code is setup well to work this way) if there was a "providesFog" switch that would let the user implement their own fog which would return a color and occlusion from point P1 to P2. That way options can be explored with out messing up the nice code base.
Each type of fog can be an include file.
But then nobody uses the providesNormal switch so... just a thought.

[mclarekin]

With fog being generated as the inside volume of a primitive shape, a torus could produce cool smoke rings coming out of a shadertoy locomotive. Rocking on down the line  in La La Land as the generated clouds float by, and then the particle generator mimics rain, followed by the appearance of a  of a rainbow from several coloured half fog toruses (now what is the plural for torus, tori?)

Ahhh, the possibilities are infinite, but unfortunately I just checked out my warehouse, and as I suspected, it seems I'm running low on ability.  Lord only knows when the next shipment will arrive, if it ever does!

[knighty]

@eiffie:
You are right. We have to find a way to organize the different effects and allow for constructing a renderer from basic blocs. This is not a priority now. Such things are more diffucult than what they appear and need some thinking.
BTW! you last shadertoy entry is awesome!

@mclarekin:
Not really everything is possible to do in fragmentarium  (at least at interactive rates) but many things are
My dream is that fragmentarium allows for multiple output buffers, chained (or better a graph of) buffer shaders, scripted uniforms/parameters, geometry and compute shaders...

@ChrisJRodgers: Where are you? I hope you haven't burned your PC.

[Crist-JRoger]

Sorry, a lot of work and had no time. I'll try your new update today...
upd:
Okay I get it ) First render with new god-rays effect. Didn't expected but it's very quickly   Fantastic light   Knighty, I am grateful for your work!

[knighty]

 

Another update: With colored reflexion and fog and much less black dots.

[eiffie]

I need to go play with this right now! Thanks knighty.

[knighty]

 

[Crist-JRoger]

  Niiiiiiice  

[DarkBeam]

Awesomeness has surpassed the bailout!

[Kali]

Wow, thanks God I found this thread!

Great work, guys!

Have to check all the posts I missed in my absence 

[SCORPION]

Kali, now's your raytracer option is needed to surround the light!
http://www.fractalforums.com/fragmentarium-gallery/bad-memories/

[Kali]

Kali, now's your raytracer option is needed to surround the light!
http://www.fractalforums.com/fragmentarium-gallery/bad-memories/

Hehe... that implementation was so lame and sloooow that I don't think it deserves a place here after looking at such great results!

But I have a yet unpolished Fragmentarium script based on eiffie's implementation of some papers knighty pointed out, for a very fast volumetric option using the backbuffer.

I don't remember well but it has a nasty bug I never fixed. Also the quality is not that great but it's good for some really fast volumetric effects.

Maybe that .frag exists already somewhere and I also missed it? eiffie used this technique here I think, using his rendering tool:

<a href="https://www.youtube.com/v/pY2PXQtoPOQ&rel=1&fs=1&hd=1" target="_blank">https://www.youtube.com/v/pY2PXQtoPOQ&rel=1&fs=1&hd=1</a>

(damn, I love that video)

[eiffie]

I think there was a bug in the way I defined the 360 camera (the first pass from the light's perspective) but with all the geometry it is hard to tell.
It is fast though! Here is a real-time example of a similar technique (if you have a fast GPU).
https://www.shadertoy.com/view/lls3Wf
... and thanks to Knighty for that paper (I never understood but had pretty pictures)!