Ron Parker <par### [at] fwicom> wrote

> Anyway, there's an easier way to get that effect:
>
>   #declare LightPos=<...>;
>   #declare ShadowOnlyObject=...
>
>   light_source { LightPos rgb 1}
>   object { ShadowOnlyObject bounded_by {sphere { LightPos .001 }}}

    Cool. This doesn't look as if it *ought* to work, because POV-Ray has an
absolute concept of "inside" - but it does. Clearly the shadow test uses ray
intersections to determine whether a "legal" part of the object is blocking
light, so is fooled if the lightsource is inside the bounding object.

    -Robert Dawson

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