/* =======================================================================
   cs171CommonVec.cpp: common vector-oriented stuff for CS 171A

   Based on the code written at Cornell University by Jim Arvo and adapted 
   for the PCGV framework at Cornell University by James Durkin, Gordon
   Kindlmann and Philip Hubbard.
   ======================================================================= */


#include "cs171CommonVec.h"


/* class cs171Vec3 ======================================================= */


/* public ---------------------------------------------------------------- */


/* Make this vector into a unit vector, and return the length it had before
   it was normalized. */
double
cs171Vec3::normalize()
{
   double d = len();
   if(d > 0.0) {
      double c = 1.0 / d;
      x() *= c;
      y() *= c;
      z() *= c;
   }
   return(d);
}