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diff --git a/hw4/include/diffuseBrdf.h b/hw4/include/diffuseBrdf.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 _DIFFUSEBRDF_H_
+#define _DIFFUSEBRDF_H_
+
+#include "brdf_base.h"
+
+class diffuseBrdf : public brdf_base {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  diffuseBrdf(const color& albedo);
+  diffuseBrdf(const diffuseBrdf& src);
+
+  ///////////////
+  // Operators //
+  ///////////////
+  diffuseBrdf& operator=(const diffuseBrdf& src);
+
+  /////////////
+  // Methods //
+  /////////////
+  virtual color shade(const vec3d& in, const vec3d& out) const final override;
+
+  virtual bool isSpecular(void) const final override;
+  virtual bool isDiffuse(void) const final override;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(diffuseBrdf& a, diffuseBrdf& b) { a._swap(b); }
+  friend std::ostream& operator<<(std::ostream& s, const diffuseBrdf& b)
+  {
+    b._print(s);
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const diffuseBrdf& src);
+  void _swap(diffuseBrdf& src);
+  virtual void _print(std::ostream& s) const override;
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  color _albedo;
+};
+
+#endif /* _DIFFUSEBRDF_H_ */