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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