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December 4, 2012
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One of those shots by Schmiegel One of those shots by Schmiegel
Caustics & dispersion with a simple glass object - Blender & YafaRay :heart:

Lots of things to improve for that scene - but glad I got that far ;)
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:iconluxxeon:
LuxXeon Featured By Owner Dec 4, 2012  Professional Digital Artist
The dispersion looks great. Needs some more sampling to clean up the artifacts, but it's a great effect, and perfect shape to do it with. :thumbsup:
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:iconschmiegel:
Schmiegel Featured By Owner Dec 4, 2012
Thank you - that scene was configured to use 5*10^8 = 50.000.000 photons - not sure why the refractions still are noisy ...
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:iconluxxeon:
LuxXeon Featured By Owner Dec 4, 2012  Professional Digital Artist
Hmm. I'd have to understand a little more how that particular renderer handles sampling to make a guess at what to tweak. I'm no expert on the matter anyway, but going by some of the different sampling modes used in the engines I'm familiar with, like Luxrender and Octane, I'm guessing it may have to do with the efficiency of path tracing/sampling algorithms. There may be some particular setting you need to tweak here in order to more efficiently handle the noise sampling, because regardless of the amount of Photons used for the caustics in the scene, if the light samples in the scene aren't being handled efficiently, it will never clear up the noise no matter how long you allow it to try.
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:iconschmiegel:
Schmiegel Featured By Owner Dec 5, 2012
Tried Luxrender too with a glass + caustic + dispersion render - but it did not finish in a big amount of time I gave it - probably I picked some bad settings :/

Anyway - in the above scene I've used the predefined glass material and added a little tint of green. Actually, if you look at the spherical shape you should expect caustics to be focused inside the shadow area - so it appears to me that the image was rendered using a negative ior :D

I checked the source file and the ior was a positive number. Don't know what I'm doing here - especially as the render result has correct focus now that I moved it to another machine, tweaked some settings (and none of them was ior) ...

... this confirms: me + Blender always is somewhat erratic ... ;)
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:iconnic022:
nic022 Featured By Owner Dec 4, 2012
well done
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:iconschmiegel:
Schmiegel Featured By Owner Dec 4, 2012
Thank you
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:icontimemit:
timemit Featured By Owner Dec 4, 2012  Student Digital Artist
neat..caustics are killer
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:iconschmiegel:
Schmiegel Featured By Owner Dec 4, 2012
Yep - love them too - hope to develop some transparency render skills soon ;)
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