On 12/01/2014 5:54 PM, MichaelJF wrote:
> I'm not quite sure what we have here. Negative light is a feature which can be
> used artistically, but then the shadows must be affected too. In your additional
> scenes the shadows of the positive light still seems to be not influenced by the
> negative light.

As Christoph explained. See next two images.

> Most likely we're hunting down a bug here. My opinion is that
> negative light gives more artistic freedom but then it must be implemented
> correctly.

I wonder how it would work with caustics and photons?

Other than surreal images. You might use it to reduce the brightness 
locally, in a scene.

> For photorealistic renderings it is not necessary. May be Christoph
> Lipka can shed more light onto this issue.

Nice one! :-)


-- 
Regards
     Stephen

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