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diff --git a/hw4/include/reflectanceParameter.h b/hw4/include/reflectanceParameter.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 _REFLECTANCEPARAMETER_H_
+#define _REFLECTANCEPARAMETER_H_
+
+#include <memory>
+#include <ostream>
+
+#include "vec2d.h"
+#include "vec3d.h"
+#include "color.h"
+#include "texture_base.h"
+
+class scalarReflectanceParameter {
+ public:
+  /////////////////
+  // Constructor //
+  /////////////////
+  scalarReflectanceParameter(float value=0.0f);
+  scalarReflectanceParameter(const std::shared_ptr<const texture_base>& texture, unsigned int channel=0);
+  scalarReflectanceParameter(const scalarReflectanceParameter& src);
+
+  //////////////
+  // Operator //
+  //////////////
+  scalarReflectanceParameter& operator=(const scalarReflectanceParameter& src);
+
+  float operator()(const vec2d& textureCoord) const;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(scalarReflectanceParameter& a, scalarReflectanceParameter& b) { a._swap(b); }
+
+  friend std::ostream& operator<<(std::ostream& s, const scalarReflectanceParameter& param)
+  {
+    if(param._texture) s << param._texture << "(channel=" << param._channel << ")";
+    else s << param._value;
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const scalarReflectanceParameter& src);
+  void _swap(scalarReflectanceParameter& swp);
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  float _value;
+  unsigned int _channel;
+  std::shared_ptr<const texture_base> _texture;
+};
+
+
+class colorReflectanceParameter {
+ public:
+  /////////////////
+  // Constructor //
+  /////////////////
+  colorReflectanceParameter(color value=color(0.0f));
+  colorReflectanceParameter(const std::shared_ptr<const texture_base>& texture);
+  colorReflectanceParameter(const colorReflectanceParameter& src);
+
+  //////////////
+  // Operator //
+  //////////////
+  colorReflectanceParameter& operator=(const colorReflectanceParameter& src);
+
+  color operator()(const vec2d& textureCoord) const;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(colorReflectanceParameter& a, colorReflectanceParameter& b) { a._swap(b); }
+
+  friend std::ostream& operator<<(std::ostream& s, const colorReflectanceParameter& param)
+  {
+    if(param._texture) s << param._texture;
+    else s << param._value;
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const colorReflectanceParameter& src);
+  void _swap(colorReflectanceParameter& swp);
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  color _value;
+  std::shared_ptr<const texture_base> _texture;
+};
+
+#endif /* _REFLECTANCEPARAMETER_BASE_H_ */