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diff --git a/hw2/include/ray.h b/hw2/include/ray.h
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+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#ifndef _RAY_H_
+#define _RAY_H_
+
+#include <ostream>
+#include "vec3d.h"
+#include "transformation3d.h"
+
+class ray {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  ray(const vec3d& origin = vec3d(), const vec3d& direction = vec3d());
+  ray(const ray& src);
+
+  ////////////////
+  // Inspectors //
+  ////////////////
+  const vec3d& origin(void) const    { return _origin; }
+  const vec3d& direction(void) const { return _direction; }
+
+  ///////////////
+  // Operators //
+  ///////////////
+  ray& operator=(const ray& r);
+  vec3d operator()(float t) const;
+  float operator()(const vec3d& point) const;
+
+  //////////////
+  // Mutators //
+  //////////////
+  ray& transform(const transformation3d& t);
+  ray& inverseTransform(const transformation3d& t);
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(ray& a, ray& b)  { a._swap(b); }
+  friend ray transform(const ray& r, const transformation3d& t) { return ray(r).transform(t); }
+  friend ray inverseTransform(const ray& r, const transformation3d& t) { return ray(r).inverseTransform(t); }
+  friend std::ostream& operator<<(std::ostream& s, const ray& r)
+  {
+    s << r.origin() << "->" << r.direction();
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _swap(ray& r);
+  void _assign(const ray& r);
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  vec3d _origin;
+  vec3d _direction;
+};
+
+#endif /* _RAY_H_ */