Ray.h

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#ifndef Ray_h
#define Ray_h

#include "Point.h"
#include "Vector.h"

class Ray {
 public:
  unsigned char is_neg[3];
  Vector inv_direction;


  Ray() {
      org = Point(0.0, 0.0, 0.0);
      dir = Vector::zero();
      inv();
  }
  Ray(const Point& origin, const Vector& direction)
    : org(origin), dir(direction) {
      inv();
  }
    
  ~Ray() {
  }
  Ray(const Ray& copy)
      : org(copy.org), dir(copy.dir) {
      inv();
  }
#if 0
  Ray& operator=(const Ray& copy) {
    org = copy.org;
    dir = copy.dir;
    inv();
    return *this;
  }
#endif
  const Point& origin() const {
    return org;
  }
  const Vector& direction() const {
    return dir;
  }

 private:
   Point org;
   Vector dir;

   void inv()
   {
      inv_direction = Vector(1/dir.x(), 1/dir.y(), 1/dir.z()); 
      is_neg[0] = ( (inv_direction.x() < 0) ? 1 : 0); 
      is_neg[1] = ( (inv_direction.y() < 0) ? 1 : 0); 
      is_neg[2] = ( (inv_direction.z() < 0) ? 1 : 0); 
   }


};

#endif

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