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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