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/* vnormalize( V ) // Normalize vector A. 
         Returns a unit length vector in the direction of A. 
        Formula: vnormalize(A)= A / vlength(A).
!Warning: Using vnormalize(<0,0,0>) will result in an error.
*/
//---------------------------------------------------------
#if( vlength(V) != 0 ) // if is not <0,0,0>
  #declare Vo = vnormalize( V );
#end
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//---------------------------------------------------------