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diff --git a/hw4/src/directionalLightsource.cpp b/hw4/src/directionalLightsource.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 "constants.h"
+#include "directionalLightsource.h"
+
+//////////////////
+// Constructors //
+//////////////////
+directionalLightsource::directionalLightsource(const vec3d& direction, const color& power)
+{
+  _direction = normalize(direction);
+  _power = power;
+}
+
+
+/////////////
+// Methods //
+/////////////
+lightSample directionalLightsource::intensityAt(const vec3d& point) const
+{
+  return lightSample(_direction, _power, +LARGE);
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void directionalLightsource::_print(std::ostream& s) const
+{
+  s << "Directional Lightsource: direction=" << _direction << ", power=" << _power;  
+}