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diff --git a/hw4/include/lightSample.h b/hw4/include/lightSample.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 _LIGHTSAMPLE_H_
+#define _LIGHTSAMPLE_H_
+
+#include "vec3d.h"
+#include "color.h"
+#include "constants.h"
+
+class lightSample {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  lightSample(const vec3d& direction=vec3d(0.0f, 0.0f, 0.0f),
+	      const color& emittance=color(0.0f, 0.0f, 0.0f),
+	      float distance=+LARGE,
+	      float pdf=1.0f,
+	      float foreshortening=1.0f);
+
+  lightSample(const lightSample& ls);
+
+  ///////////////
+  // Operators //
+  ///////////////
+  lightSample& operator=(const lightSample& ls);
+
+  const color& operator()(void) const;
+
+  ////////////////
+  // Inspectors //
+  ////////////////
+  const vec3d& directionToPoint(void) const;
+  vec3d directionToLight(void) const;
+  
+  const color& emittance(void) const;
+  float distance(void) const;
+
+  float pdf(void) const;
+  float foreshortening(void) const;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(lightSample& a, lightSample& b) { a._swap(b); }
+  friend std::ostream& operator<<(std::ostream& s, const lightSample& ls)
+  {
+    s << "LightSample: direction=" << ls.directionToPoint() << ", emittance=" << ls() << ", distance=" << ls.distance() << ", pdf=" << ls.pdf() << ", foreshortening=" << ls.foreshortening();
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const lightSample& ls);
+  void _swap(lightSample& ls);
+  
+  //////////////////
+  // Data Members //
+  //////////////////
+  vec3d _direction;
+  color _emittance;
+  float _distance;
+  float _pdf;
+  float _foreshortening;
+};
+
+#endif /* _LIGHTSAMPLE_H_ */