On the topic of lighting, here's an idea for something to include in the
next version: Negative Lighting.

What this negative lighting would do is, it would make the texture
dark/transparent where it is hit by light, and bright in shadow. This would
be handy for making special effects, or for lights on the nightside of a
planet. In the case of the nightside lights, it would be a lot easier than
having to use objects for the different sides of the planet.

The option for using negative lighting would be something like this:

sphere{<0,0,0> 2
  pigment{
    image_map{
      png "nightlights.png"
      map_type 1 // I think that's spherical mapping
      }
    negative_light on
    }
  }

I don't know what kind of special effects could be made using this, but you
did include no_image, no_reflection, no_shadow, etc, and they can be used
to make special effects.

Rohan _e_ii

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