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syngola nous illumina en ce 2008-09-12 12:32 -->
> Hi everyone,
>
> i played a little with cutting nested spheres with another one. would like to
> know what to improve on the texture. i am quite unsure if the lower region of
> the outer sphere isn't too bright.
>
> regards, peter
>
>
> ------------------------------------------------------------------------
>
Nice.
You should note that the hot spot under your hollow nested spheres should NOT be
there. They are effectively acting as divergent lences. Apparently, you used the
caustics keyword, remove it and use photons to get a realistic effect.
Set your spheres in an union, and give it the following:
photons{target refraction on reflection on}
and add the followint to your global_settings:
photons{spacing 0.1}//minimal basic photons block
About the finish:
How much ambient do you have? It looks like it's set to high. It may be better
with ambient 0, a low difuse, like difuse 0.5 or maybe less. Usualy, glass rely
on it's interior more than on it's surface for it's colouration and aspect.
Glass, and almost every transparent substances have variable reflection. Low
value (about 0.1 for glass) when viewed perpendicaly, almost 1 for tangent rays.
Also set fresnel on.
Don't forget to set conserve_energy in your finish.
The pigment can be close to rgbt 1.
For the interior:
Rely more on fade_color, fade_distance and fade_power to get your colouration.
In your case, you'll need a small fade_distance, about 1/2 the thickness of your
shell. Reduce that value for the inner shells, as well as making the fade_color
darker.
Realistic value for the fade_power of tranparent substances are 1 or 1001.
It look like your glass contains some media. If it does, and it's emissive
media, change it to scatthering media. Your glass is not supposed to emit light.
--
Alain
-------------------------------------------------
You know you've been raytracing too long when your wife's raytraced image you
made to flatter her is the only one you see of her anymore.
Ken Tyler
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