Xplo Eristotle <xpl### [at] infomagicnet> wrote in 
news:3d756b77$1@news.povray.org:

> MIKA wrote:
>> This sucker took 22 hours to render on a 1ghz.
>> 
>> They look impressive but not quite what one would expect from a real
>> diamond.
> 
> I'm curious about the settings you used, particularly the 
> max_trace_level and the photons (since in both cases it appears you may 
> not be using high enough values).
> 
> I would also guess that you may be using too much dispersion, as your 
> render is noticibly more rainbowy than the photo.
> 
> You might consider making the surface the diamonds are resting on 
> non-reflective if it results in a significant speed increase.
> 
> -Xplo
> 
> 

Took a couple of days to put the diamond together using math (no GUI, plain 
text)

This was a test run (aren't they all..)

The diamonds are 1 POV unit in diameter.

global_settings {
  photons { spacing 0.08 count 5000 } 
  max_trace_level 60
}

light_source { < -11, 40, -7 >, White*2 parallel point_at <0,0,0> }


Box under diamonds
------------------
finish  { ambient .05 diffuse .6 reflection .1 }    	
photons { target 1 refraction off reflection off }


Diamonds
--------
finish { ambient  0    diffuse    0.2
         specular 0.8  roughness  0.003
         phong    1    phong_size 400
         reflection { 0.15, 0.05 fresnel metallic }
}
interior { ior 2.417  dispersion 1.044 dispersion_samples 30 }
photons { target 1 refraction on reflection on }

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