Maurice nous apporta ses lumieres en ce 2005-01-10 12:17:
> Ger wrote:
> 
> Thanks for your input, it is very inspiring. See comments below.
> 
>> //...............................................
>> global_settings {
>>         max_trace_level 255
>>         photons {
>>                 count 1000000
>>                 autostop 0
>>                 jitter .1
>>                 }
>>         }
>>
> That is a very high count. I'm using default value. I start to 
> understand why I don't get caustics
That's NOT a very high count. Look at all the dots...
Using spacing, I can easily get over 10 000 000
> My photons settings:
>   photons {
>       spacing 1/2
>     gather 20,100
>       max_trace_level 300// I think that it can't go over 255
>       jitter 0.4
>       adc_bailout 0.01
>       save_file "newt.photons"
>   }
You usualy need smaler spacing. That's about 1 photon per half unit... I 
rarely start with a spacing over 1/10


> 
> Mmm that's interesting. My lightsource has no photons attached :-\
A light_source without a photons block don't shoot any, and don't 
contribute to the photons caustics.
> 
>> #declare YourBlobbyGlassThing =
>>         blob.................. etc
>>                 material { M_Glass3 }
>>         photons {
>>                 target
>>                 refraction on
>>                 reflection on
>>                 collect on
>>                 }
>>
>>         }
>>         
> 
> 
> photons block of the blob:
>   photons{
>     target 0.05
>     refraction on
>     reflection on
>     collect off // **
>   }
> 
> Why did you switch on collect? Doesn't that mean that photons are not 
> exiting the object after they hit it?
Collect on make the object show photons effects ON it. It don't stop the 
photons. As, normaly, photons don't show on mostly reflective and/or 
transparent object, collect on just waiste time for usualy negligeagle 
effect.

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Ger wrote:

> Looking for something like in the attached picture?

Ger,
Did you use differently coloured lightsources to get those rainbow-like 
effects in the top of the picture?

-- 
Maurice

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On Wednesday 12 January 2005 19:54, Maurice wrote :

> Ger wrote:
> 
>> Looking for something like in the attached picture?
> 
> Ger,
> Did you use differently coloured lightsources to get those rainbow-like
> effects in the top of the picture?
> 
Nope, just the one light that I gave you in the code bit.
The whole scene is just 3 things, the plane, the ashtray and 1 light

-- 
Ger

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Maurice nous apporta ses lumieres en ce 2005-01-12 13:54:
> Ger wrote:
> 
>> Looking for something like in the attached picture?
> 
> 
> Ger,
> Did you use differently coloured lightsources to get those rainbow-like 
> effects in the top of the picture?
> 
Try adding dispersion <some value> in your interior block. Realistic values from 1.001
to 1.03, 
artistic values from 0.7 to 0.99 (reverced effect) and 1.05 to 1.5 (stronger to WAY
stronger 
than real effect)
Zero and negative value make the object reflective with no transparency left.

Alain

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