Good guess, but Christoph Hormann has guessed correctly. See the 
original Tuesday Mystery thread.

Norbert Kern wrote:

> my third guess:
> 
> two pass render:
> 1. blurred b/w image
> 2. first render used as image_pattern for a texture with high ambient values
> according to brighter parts of the first render and ambient zero for
> shadowed parts.
> That should explain some artefacts.
> 
> 
> Norbert


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Samuel Benge

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