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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