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A simple, but time consuming render of some glass cubes.
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Download 'glasscubes.jpg' (70 KB)
Preview of image 'glasscubes.jpg'
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"Sven-Erik Andersen" <sve### [at] gmail com> wrote:
> A simple, but time consuming render of some glass cubes.
Simple and elegant, very beautifull image.
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> A simple, but time consuming render of some glass cubes.
Nice image.
Now, just a little nit picking: you need to reduce your photon's spacing
or increase the count. Those round splotches on the left of the cube are
photons artefacts. the orange spots in the cubes are also probably of
the same nature.
Alain
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I increased the count from 20000 to 1000000, and reduced the spacing from 1 to
0.001, and from a few, big orange spots I ended up with many small spots... ;-)
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Download 'glasscubes2.png' (653 KB)
Preview of image 'glasscubes2.png'
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> I increased the count from 20000 to 1000000, and reduced the spacing from 1 to
> 0.001, and from a few, big orange spots I ended up with many small spots... ;-)
There is a real improvement.
You should never use both count and spacing.
Also, your changes are not concistent:
Count from 20000 to 1000000 is 50 times more.
Spacing from 1 to 0.001 is 1000000 (1 million) times more!
If you use count, POV-Ray adjust the spacing to get about that number of
photons after adjusting for the various light_source and target objects.
OK if you have only one light_source and few objects.
If you use spacing, POV-Ray will shoot photons using that value untill
it have covered all target objects from every participating
light_source, using as many photons as needed.
In the statistics, what is the reported number of photons?
You seem to have 3 lights, 2 whites and one orange and 27 potentialy
target objects.
You may need to increase the gatthering radius.
If using count, you may need up to 10 times as many photons.
If using spacing, and your small cubes are about 1 unit whide, a value
between 0.01 and 0.005 should be enough in most cases.
You also probably need a max_trace_level of at least 7, probably around
15 or so.
Alain
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Thanks for all the tips about photons, Alain!
I circumvented the problem with moving the orange spotlight a little bit as you
can see in the new picture. There are no orange spots anymore.
The number of photons shot is 437572, and Surface photons stored is 23058883.
The cubes are about 2 units wide.
I will try a new render over night with the spotlight back at the original
point_at, and with just a spacing of the photons.
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Download 'glasscubes3.png' (585 KB)
Preview of image 'glasscubes3.png'
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The render failed several times do to too litle memory, so I ended up with a
spacing at 0.1.
The resulting image is included.
And either the reduction in spacing, or changes in POV-Ray from 3.7 RC2 to RC3
caused the colors in the image to change a lot...
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Download 'glasscubes4.png' (678 KB)
Preview of image 'glasscubes4.png'
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Am 24.01.2011 09:45, schrieb Sven-Erik Andersen:
> And either the reduction in spacing, or changes in POV-Ray from 3.7 RC2 to RC3
> caused the colors in the image to change a lot...
Did you perhaps also change max_trace_level?
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clipka <ano### [at] anonymousorg> wrote:
> Did you perhaps also change max_trace_level?
No, it is still at 25 as it has been all the way.
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