This is pretty cool!

A note about the render time: whenever you have photons hitting almost
parallel to a surface (as you have here), you'll need a relatively high
density (as you have here), which means long render time.

You might be able to decrease the density without losing quality (but
maybe not).

-Nathan

ingo wrote:
> 
> Thank you Nathan!!
> 
> The picture itself is boring, but to me it shows the accuracy of Nathans
> patch.
> 
> I modelled a fresnel lens wit a focaldistance of 5 units, put a lightsource
> at 5 units from it. The result should be, and is a parallel beam of photons.
> 
> photons
> 
>       gather 30, 100
>       radius 0.1, 2, 0.1
>       jitter 0.2
>   }
> 
>  photons {
>       density 0.002
>       refraction on
>   }
> 
> It (800 x 600) took about 5 h 30 m to render on a PII 233.
> 
> ingo
> --
> Met dank aan de muze met het glazen oog.
> 
>  [Image]

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