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diff --git a/hw6/src/lightSample.cpp b/hw6/src/lightSample.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 <cmath>
+#include "lightSample.h"
+
+
+//////////////////
+// Constructors //
+//////////////////
+lightSample::lightSample(const vec3d& direction,
+			 const color& emittance,
+			 float distance,
+			 float pdf,
+			 float foreshortening)
+{
+  float length = direction.length();
+  _direction = (length < EPSILON) ? vec3d(0.0f, 0.0f, 0.0f) : direction / length;
+  _emittance = emittance;
+  _distance = distance;
+  _pdf = std::max(pdf, 0.0f);
+  _foreshortening = std::max(foreshortening, 0.0f);
+}
+
+
+lightSample::lightSample(const lightSample& ls)
+{
+  _direction = ls._direction;
+  _emittance = ls._emittance;
+  _distance = ls._distance;
+  _pdf = ls._pdf;
+  _foreshortening = ls._foreshortening;
+}
+
+
+///////////////
+// Operators //
+///////////////
+lightSample& lightSample::operator=(const lightSample& ls)
+{
+  _assign(ls);
+  return(*this);
+}
+
+
+const color& lightSample::operator()(void) const
+{
+  return _emittance;
+}
+
+
+////////////////
+// Inspectors //
+////////////////
+const vec3d& lightSample::directionToPoint(void) const
+{
+  return _direction;
+}
+
+
+vec3d lightSample::directionToLight(void) const
+{
+  return -_direction;
+}
+
+
+const color& lightSample::emittance(void) const
+{
+  return _emittance;
+}
+
+
+float lightSample::distance(void) const
+{
+  return _distance;
+}
+
+
+float lightSample::pdf(void) const
+{
+  return _pdf;
+}
+
+
+float lightSample::foreshortening(void) const
+{
+  return _foreshortening;
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void lightSample::_assign(const lightSample& ls)
+{
+  // sanity check
+  if(&ls == this) return;
+
+  // copy
+  _direction = ls._direction;
+  _emittance = ls._emittance;
+  _distance = ls._distance;
+  _pdf = ls._pdf;
+  _foreshortening = ls._foreshortening;
+}
+
+
+void lightSample::_swap(lightSample& ls)
+{
+  swap(_direction, ls._direction);
+  swap(_emittance, ls._emittance);
+  std::swap(_distance, ls._distance);
+  std::swap(_pdf, ls._pdf);
+  std::swap(_foreshortening, ls._foreshortening);
+}