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diff --git a/hw6/src/ray.cpp b/hw6/src/ray.cpp
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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.                                                  */
+/******************************************************************/
+
+#include "ray.h"
+
+//////////////////
+// Constructors //
+//////////////////
+ray::ray(const vec3d& origin, const vec3d& direction)
+{
+  _origin = origin;
+  _direction = normalize(direction);
+}
+
+ray::ray(const ray& r)
+{
+  _origin = r._origin;
+  _direction = r._direction;
+}
+
+
+///////////////
+// Operators //
+///////////////
+ray& ray::operator=(const ray& r)
+{
+  _assign(r);
+  return *this;
+}
+
+
+vec3d ray::operator()(float t) const
+{
+  return _origin + t*_direction;
+}
+
+
+float ray::operator()(const vec3d& point) const
+{
+  return _direction.dot(point - _origin);
+}
+
+
+//////////////
+// Mutators //
+//////////////
+ray& ray::transform(const transformation3d& t)
+{
+  _origin = t.transformPoint(_origin);
+  _direction = t.transformDirection(_direction);
+  return *this;
+}
+
+
+ray& ray::inverseTransform(const transformation3d& t)
+{
+  _origin = t.inverseTransformPoint(_origin);
+  _direction = t.inverseTransformDirection(_direction);
+  return *this;
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void ray::_swap(ray& r)
+{
+  swap(_origin, r._origin);
+  swap(_direction, r._direction);
+}
+
+
+void ray::_assign(const ray& r)
+{
+  _origin = r._origin;
+  _direction = r._direction;
+}