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#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.
JFMILLER
"Greg M. Johnson" <gregj:-)565### [at] aol com> wrote in message
news:3da47966@news.povray.org...
> Why would the following code:
>
> #declare p0=MyTrack(nclock);
> #declare p1=MyTrack(nclock+1/npoints);
> #declare p2=MyTrack(nclock+2/npoints);
>
> #declare dr1=p1-p0;
> #declare drx1=vnormalize(vcross(y+0.001,dr1));
> //this_is_line_76
> #declare dry1=vnormalize(vcross(drx1-0.0001,dr1));
> //this_is_line_77
>
>
>
> give me an error of:
>
> File: C:\pov35\ini\sweep05.pov Line: 76
> Error: Normalizing zero-length vector.
> File: C:\pov35\ini\sweep05.pov Line: 77
> Error: Normalizing zero-length vector.
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