"jfmiller" <jfm### [at] hotmailcom> wrote in message
news:3da49b57$1@news.povray.org...
> #declare drx1=vnormalize(vcross(y+0.001,dr1)
>
> y+0.001  <--  `y` is a vector <0,1,0>   Adding a scaler to a vector is
> normally not a good idea.
>
> I'm not sure what POV does with this but my guess is it is the source of
> your error.
>

Just FYI, Pov would extend y+0.001 to <0,1,0> + <0.001,0.001,0.001>

-tgq

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