"Kenneth" <kdw### [at] gmailcom> wrote:

>
> While *special* values can be chosen for both lines' end points to produce
> a trace that looks like a perfect 'hit' at the intersection, it's not really
> so.

Sorry, that didn't clearly express what I meant.  Reworded:

"While particular values CAN be chosen for both lines' start/end points to
produce a trace that *looks like* a perfect hit at the intersection, the result
is most likely not very accurate."

Also...

>
> // A sphere to indicate the found position. (If this ends up AT the
> // origin, then the trace ray has totally missed the target line.)
> #if(vlength(norm) !=0)
> sphere{0,.35
> no_shadow
> pigment{rgb 1*<.3,1,1>}
> translate found_position
> }
> #else
> #end
>

It's probably better to leave out the #if/#else/#end; then a trace ray that
misses the target will actually SHOW the sphere at the origin.

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