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diff --git a/hw6/src/lightsourceShader.cpp b/hw6/src/lightsourceShader.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 <cassert>
+#include "lightsourceShader.h"
+
+
+//////////////////
+// Constructors //
+//////////////////
+lightsourceShader::lightsourceShader(const std::shared_ptr<const lightsource_base>& lightsource, const std::shared_ptr<const shader_base>& reflectanceShader)
+{
+  assert(lightsource);
+  _lightsource = lightsource;
+  _reflectanceShader = reflectanceShader;
+}
+
+
+/////////////
+// Methods //
+/////////////
+color lightsourceShader::shade(const intersectionPoint& ip, const vec3d& light_dir) const
+{
+  color result = _lightsource->_emittance(ip); 
+  if(_reflectanceShader) result += _reflectanceShader->shade(ip, light_dir);
+  return result;
+}
+
+
+color lightsourceShader::reflectance(const intersectionPoint& ip, const vec3d& light_dir) const
+{
+  return (_reflectanceShader) ? _reflectanceShader->reflectance(ip, light_dir) : color();
+}
+
+
+brdfSample lightsourceShader::sample(const intersectionPoint& ip, float r1, float r2) const
+{
+  return (_reflectanceShader) ? _reflectanceShader->sample(ip, r1, r2) : brdfSample();
+}
+
+
+float lightsourceShader::reflectivity(const intersectionPoint& ip) const
+{
+  return (_reflectanceShader) ? _reflectanceShader->reflectivity(ip) : 0.0f;
+}
+
+
+shaderProperties lightsourceShader::properties(const intersectionPoint& ip) const
+{
+  return (_reflectanceShader) ? _reflectanceShader->properties(ip) : shaderProperties(false, false);
+}
+
+
+color lightsourceShader::emittance(const intersectionPoint& ip) const
+{
+  return _lightsource->_emittance(ip);
+}
+
+///////////////////////
+// Protected Methods //
+///////////////////////
+void lightsourceShader::_print(std::ostream& s) const
+{
+  s << "LightsourceShader: light=" << *_lightsource << ", reflectance shader=";
+  if(_reflectanceShader) s << *_reflectanceShader;
+  else s << "None.";
+}