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diff --git a/hw6/include/brdf_base.h b/hw6/include/brdf_base.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 _BRDF_BASE_H_
+#define _BRDF_BASE_H_
+
+#include <ostream>
+#include "vec3d.h"
+#include "color.h"
+#include "brdfSample.h"
+
+class brdf_base {
+ public:
+  /////////////
+  // Methods //
+  /////////////
+
+  // Note: 'in' and 'out' point away from the surface point
+  // Note: 'in' and 'out' are specified in the local shading frame,
+  //       where the normal=(0.0, 0.0, 1.0).
+  virtual color shade(const vec3d& in, const vec3d& out) const = 0;
+
+  // Same convention for in and out.
+  // Returns: reflected radiance
+  virtual color reflectance(const vec3d& in, const vec3d& out) const = 0;
+
+  // Same convention for in and out.
+  // r1 and r2 are two uniform random variables.
+  // Returns: brdfSample record
+  virtual brdfSample sample(const vec3d& in, float r1, float r2) const = 0;
+
+  // returns true if BRDF has a specular/diffuse component
+  virtual bool isSpecular(void) const = 0;
+  virtual bool isDiffuse(void) const = 0;
+
+  // return the total reflectivity of the mateterial
+  virtual float reflectivity(void) const = 0;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend std::ostream& operator<<(std::ostream& s, const brdf_base& b)
+  {
+    b._print(s);
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  virtual void _print(std::ostream& s) const = 0;
+};
+
+#endif /* _BRDF_BASE_H_ */