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nemesis nous apporta ses lumieres en ce 2008/01/24 22:24:
> jhu escreveu:
>> Thanks! My global settings are listed below. What do you suggest I
>> change?
>
> hmm, no photons for caustics? It seems radiosity is creating some weird
> kind of caustics by its own, except it's black!
>
> Now, count 1000 and error_bound .05?! whew! Took a few days to render,
> huh? ;)
>
> In my radiosity scenes I like more fine-grained radiosity shading so I
> generally go for pretrace_start 0.04 and pretrace_end 0.008 or something
> like that. But I go with error_bound .2: it's acceptably slow and
> gives good results for the blending of blotches, specially coupled with
> nearest_count of about 16. Count is about right, though I first try
> with lower counts, like 200 to 600...
>
> As for the dark spots, the correct way to get caustics in povray is with
> photons. Radiosity has problems with black spots and glass surfaces.
> Use a first radiosity pass without the reflective or transparent
> surfaces, save that rca file and then render the final image with
> photons and the reflective/transparent surfaces back. Test without
> photon first, then good luck. :)
In this case, replacing the radiosity with photons don't look feasible. The
caustics are a projection of the sky. You'd need to use a light dome, possibly
composed of many area_light with photons{area_light}. You'll end up with tons of
photons, meaning a photons phase that will be extremely long and a memory use
that may get prohibitive.
--
Alain
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You know you've been raytracing too long when you've tried to scan your face for
a texture.
Quietly Watching
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jhu nous apporta ses lumieres en ce 2008/01/24 19:23:
> There's still some problems with the render, such as those strange black
> splotches on the table adjacent to the clear sphere
>
>
> ------------------------------------------------------------------------
>
Nice, but it's so dark! Even pushing my monitor brightness to the max I still
loose most of it. Looks good after adjusting gamma by +2.
Maybe increasing the brightness of the sky.
You may try using:
pretrace_end 0.005, 0.0025 or 0.00125 for 1, 2 or 3 more pretraces steps.
nearest_count 20 // ask to average more samples. Maximum value.
count 1600 // Maximum value.
adc_bailout 0.01/5 //increase divider more if needed.
raising error_bound a little, maybe 0.08 to 0.12. This may at least reduce the
contrast of the dark spots.
Unless doing multipass, comment out always_sample 0
--
Alain
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No man or woman is worth your tears, and the one who is, won't make you cry.
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