Ben Lauritzen wrote:

> I haven't seen anyone mention negative light sources.  Or maybe I'm the only
> one that thinks it's really cool.  I haven't thought of a practical use of
> this, aside from looking weird, but I'm sure you could do something with it.
>
> camera {location <0, 5, 5> look_at <0, 0, 0>}
> light_source {500, 1}
> light_source {<-500, 500, 500>, 1}
> light_source {<0, 500, -500>, -1}
> sphere {0, 1 translate <0, 1, 0> pigment {rgb 1}}
> cylinder {0, <0, -1, 0>, 30 pigment {rgb 1}}
>
>  [Image]

Hadn't though to try a negative light source yet.  I like it.

You can do really cool effects with unusual lighting.  The camera here is
looking at a white plane, all of the patterns are the result of shadows from an
object not in the frame.  Is there anyway to make the camera not see certain
objects, so that they affect the scene without being seen?  Sorta how the camera
doesn't see a light source.

Dan

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