I figured out what I did wrong. The line should be 
   my $point = $u->multiply_scalar($radius * cos($angle))
             + $n_x_u->multiply_scalar($radius * sin($angle))
             + $center;

[download]
Still, I'm thinking this mistake should have been trapped for?

In reply to Re: Math::Matrix - Error: Can't locate object method "transpose" by SwaJime
in thread Math::Matrix - Error: Can't locate object method "transpose" by SwaJime

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