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A natural situation

Posted: Sun Dec 02, 2012 12:04 am
by yonosoy
Hi.
A very simple situation. Still nude, only geometry, without a physical spectrum definition for sun and atmosphere.
Real scale. Meshes from Houdini thanks to a procedural node from cmiVFX (fractal terrains). Process, materials, technical questions and much more will be posted with time.
Situacion 001 0.30 h 800 k samples-s.png

Re: A natural situation

Posted: Sun Dec 02, 2012 1:43 am
by yonosoy
With the sun in another azimuth. The reference of time and samples second corresponds to an Amd desktop and a i3 notebook connected via LAN (8 threads).
Situacion 002 0.33 h 800 k samples-s.png

Re: A natural situation

Posted: Sun Dec 02, 2012 6:04 am
by CTZn
Cool ! Do you know that Indigo has an Earth-like atmosphere simulation ? It is tricky to set up but it provides a very realistic result.

See:
http://www.indigorenderer.com/planet-sc ... simulation
http://www.indigorenderer.com/forum/vie ... 35#p101435

The camera can fly through that atmosphere, it's pretty exciting to have the camera around the ionosphere ! This feature was used to bake the sun & sky lighting scheme that exporters now use by default.

There was a test scene posted in the forum but I can't find it right now...

Re: A natural situation

Posted: Tue Dec 04, 2012 12:21 am
by yonosoy
Hi.
Yes, but thinking that this was a complement to the sun-sky system. So silly...

Some weeks testing with atmosphere medium (and the sky behind..) with a couple of problems that seems to be better now.
Actually the scene is carried out throug Cinema 4D. The radius of Earth was estimated at the begining in 6376 km. In C4D material´s preview atmosphere remains black wiht a Y value of -6376 km. At a value of -6377, -6378 the previsualization is right. If the scene is below of the sea level (in reference to the atmosphere consideration) the light seems don´t do all the travell. The sky lights and can be visible but the scene is basically or totally black. The global earthmesh was losing around 1-3 of effective kilometers because of the traduction in polygons.

The other tricky question is that little fire-flies becomes chromatic when a real tabulated media is present and post pro AD is on. Over a supersample factor of 4 the fire-flies (or chroma) are not visible in the photograph, but for AD could be a festival.

This is a shoot from 1.2 km of height (5 km below than the firsts) with Indigo´s atmospheric medium and a real scale sun (at the moment a primitive sphere wit a 6000º K blackbody material (I know that it´s possible to use an extra atmospheric sun in Sun-Sky system that for sure has a complet spectrum)).
Situation 03 2.53 h 26600 spp 444 ss (PP AD).png

Re: A natural situation

Posted: Tue Dec 04, 2012 1:02 am
by OnoSendai
Hi Yonosoy,
The Indigo atmosphere medium starts at exactly 6378135 m from the centre of the Earth.

Re: A natural situation

Posted: Tue Dec 04, 2012 2:38 am
by CTZn
I have attached the globe_test.igs as it is on my hard drive currently, but I think that I have tried merging several tests scenes into that file, not necessarily with much success in this case. However the data within should be original, so you can get usefull informations from it. Notably, the globe radius is 6378135 meters. <- *spoiled*

The postpro AD is a 2D filter wich doesn't discriminate pixels, that's the downside of its readyness.

PS: me gusta el appelido que has eligido, que lindo :)

Re: A natural situation

Posted: Tue Dec 04, 2012 2:46 am
by OnoSendai
Here's a better / more recent scene:

Re: A natural situation

Posted: Thu Oct 03, 2013 11:29 pm
by yonosoy
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Re: A natural situation

Posted: Fri Oct 04, 2013 8:52 am
by lycium
*Awesome* work in this thread, hi and welcome yonosoy!

Re: A natural situation

Posted: Fri Oct 04, 2013 12:36 pm
by yonosoy
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Re: A natural situation

Posted: Sat Oct 05, 2013 11:25 am
by yonosoy
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Re: A natural situation

Posted: Sat Oct 05, 2013 12:22 pm
by yonosoy
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Re: A natural situation

Posted: Sat Oct 05, 2013 5:47 pm
by yonosoy
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Re: A natural situation

Posted: Sat Oct 05, 2013 6:45 pm
by yonosoy
And the last for a days. So brut in this moments, but it's a try with real tabulated absortion and SSS in real scale. Work's only in console in this little machines and run well !. A simple bump pos(OS) (awaiting for this). Now, to learn ISL ...

P.D: Manages this automatically the pages? (seem too long)

Re: A natural situation

Posted: Sun Dec 01, 2013 7:05 am
by yonosoy
Testing with Metropolis Path Tracing and glass acceleration on.
Silver's sphere diameter 1 kilometer. (89º zenith). 20 h.
test_011.jpg
The first hours of Path Tracing (this time glass acc. off) scares a bit, but it's expected a convergence near the hour 60 (like other precedente images (4 old threads of 2.40)). To be updated when finished. (72º zenith).
test_012_01.jpg
Note: in the try to photo develop the exr raw format since a time (sorry for this, sometimes loose coherence).

At the same condition time over an i3 (4 no old but slow threads of 2.10) and Metropolis Path Tracing (glass acc. off again). Maybe a convergence time of a half expected. Since a versions, glass acc. is allowing (pretty bad) the travell of ligth in bidireccional mode.
test_012(metro)_01.jpg