> Is there some function or quick method of determining whether or not an
> object blocks the line-of-sight between two points?  The trace()
> function, on its own, is subject to false positives.  For example:
>
>    #declare Obstacle = torus { 3, 1 }
>    #declare Pt1 = <-1, 0, 0>;
>    #declare Pt2 = <1, 0, 0>;
>    #declare Test = <0, 0, 0>;
>    trace (Obstacle, Pt1, Pt2 - Pt1, Test)
>
> The torus does not block the line of sight between Pt1 and Pt2,

I think you'll find it does :-)

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