Experiments..

General questions about Indigo, the scene format, rendering etc...
neo0.
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Re: Experiments..

Post by neo0. » Sat Oct 09, 2010 7:37 pm

Atmospheric scattering! Yess!

Will it be possible to replicate things such as a sun set?

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lycium
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Re: Experiments..

Post by lycium » Sat Oct 09, 2010 8:16 pm

sure, look at the pictures 8)

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Sun Oct 10, 2010 12:26 am

Zom-B wrote:looks great! Reminds me of http://nis-lab.is.s.u-tokyo.ac.jp/~egak ... sia10.html

2 questions:

1) Indigo 2.4.11 ??
2) whats the banding on the snow in the canyon... shouldn't it be smooth through 32bit depth?
1. It's a trunk build (main dev version).. not really 2.4.11, just haven't updated the internal version number in trunk yet.

2. Not sure what's up with that. the displacement values should at least be interpolated.

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Sun Oct 10, 2010 12:29 am

Zom-B wrote:rayleight for correct dawn sky color and mie scattering for a atmospheric effect, this enhancements are very welcome, since the actual sky system is quite... unspectacular... to use ;)

About the mie scattering: is this a global value for the sky, where to define the size of (water!?) particle in the air to get a denser misty look, or is this a material based feature?
How can a user control this... is a giant sphere of earth atmosphere always needed? How does this perform with BiDir, since it gets less performance if scenes are BIIIIG afaik!?
The amount of Mie scattering is affected by the turbidity of the atmosphere, which can be set by the user in the same was as the current sky model.
For now we are using giant Earth-spheres, but we could probably get away with just a patch of the Earth's surface :)
We only use path tracing for these experiments, as bidir can't cope :)

StompinTom
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Re: Experiments..

Post by StompinTom » Mon Oct 11, 2010 1:02 pm

That sunset looks amazing! Any way of generalizing that into a new sky model? Sunsets just don't look as great with the current model.

neo0.
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Re: Experiments..

Post by neo0. » Mon Oct 11, 2010 3:11 pm

StompinTom wrote:That sunset looks amazing! Any way of generalizing that into a new sky model? Sunsets just don't look as great with the current model.
Agreed.

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Wed Oct 13, 2010 9:52 pm

Made a little news post about atmospheric scattering:

http://www.indigorenderer.com/node/1143

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CoolColJ
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Re: Experiments..

Post by CoolColJ » Wed Oct 27, 2010 7:01 pm

Unbiased Terragen :)

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hcpiter
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Re: Experiments..

Post by hcpiter » Fri Oct 29, 2010 12:07 am

OnoSendai wrote:Made a little news post about atmospheric scattering:

http://www.indigorenderer.com/node/1143
awesome environment !
very well ! 2nd render is good for desktop background with 2 screens.

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lycium
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Re: Experiments..

Post by lycium » Fri Oct 29, 2010 12:29 am

hcpiter wrote:2nd render is good for desktop background with 2 screens.
exactly how it's intended :)

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Sat Feb 26, 2011 6:51 am

A new test render :)
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globe_test.jpg

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OnoSendai
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Re: Experiments..

Post by OnoSendai » Sat Feb 26, 2011 6:53 am

pre-dawn render:
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predawn.jpg

StompinTom
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Re: Experiments..

Post by StompinTom » Sat Feb 26, 2011 7:19 am

HOW many samples/sec is that? :D The pre-dawn looks awesome! Improved sky model? Is it any more flexible too? Meaning, are there more parameters to tweak the color, haze and stuff?

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Re: Experiments..

Post by OnoSendai » Sat Feb 26, 2011 7:35 am

The only tweakable parameter currently is turbidity, which controls the amount of water vapour and hence Mie scattering.

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Re: Experiments..

Post by StompinTom » Sat Feb 26, 2011 7:42 am

Other engines have a Ozone setting in their model too, but I never really figure out what it does... I'm assuming the Indigo sky model doesn't use such a thing?

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