text: #ifndef __UTILITY_H
  #define __UTILITY_H
  
  #include "stdafx.h"
  
  class Utility {
  private:
  
  public:
  	Utility();
  	virtual ~Utility();
  
  	static Point_3 pointAddition(Point_3 p1, Point_3 p2);
  	static Point_3 pointSubtraction(Point_3 p1, Point_3 p2);
  	static Point_3 pointMulti(Point_3 p, double multi);
  	static double pointSquaredDistance(Point_3 p1, Point_3 p2);
  	static double pointDistance(Point_3 p1, Point_3 p2);
  	static double pointLength(Point_3 p);
  };
  
  #endif