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diff --git a/hw3/src/phongBrdf.cpp b/hw3/src/phongBrdf.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 <cmath>
+#include "constants.h"
+#include "phongBrdf.h"
+
+//////////////////
+// Constructors //
+//////////////////
+phongBrdf::phongBrdf(const color& albedo, float sharpness)
+{
+  _albedo = albedo;
+  _sharpness = sharpness;
+}
+
+
+phongBrdf::phongBrdf(const phongBrdf& src)
+{
+  _albedo = src._albedo;
+  _sharpness = src._sharpness;
+}
+
+
+///////////////
+// Operators //
+///////////////
+phongBrdf& phongBrdf::operator=(const phongBrdf& src)
+{
+  _assign(src);
+  return *this;
+}
+
+
+/////////////
+// Methods //
+/////////////
+color phongBrdf::shade(const vec3d& in, const vec3d& out) const
+{
+  // HW3: Implement this.
+  //      Returns the phong shaded color from a specular surface for an
+  //      incident lighting direction of 'in', and view direction of 'out'.
+  //      The surface normal = (0,0,1).
+  // Returns: shaded color
+  // Modifies: nothing.
+  if (out.z < EPSILON) { return color(0.0f); }
+
+  vec3d normal, r;
+  float r_dot_out;
+
+  normal = vec3d(0, 0, 1);
+  r = (2 * normal.dot(in) * normal) - in;
+  r_dot_out = r.dot(out);
+  if (r_dot_out < EPSILON) { return color(0.0f); }
+  else if (r_dot_out > EPSILON + 1) { r_dot_out = 1; }
+  return color(_albedo * pow(r_dot_out, _sharpness));
+}
+
+
+bool phongBrdf::isSpecular(void) const
+{
+  // Consider low roughness to be diffuse.
+  // Use 5.0f as an arbitrary threshold.
+  return (_sharpness > 5.0f);
+}
+
+
+bool phongBrdf::isDiffuse(void) const
+{
+  return !isSpecular();
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void phongBrdf::_assign(const phongBrdf& src)
+{
+  _albedo = src._albedo;
+  _sharpness = src._sharpness;
+}
+
+
+void phongBrdf::_swap(phongBrdf& src)
+{
+  swap(_albedo, src._albedo);
+  std::swap(_sharpness, src._sharpness);
+}
+
+
+void phongBrdf::_print(std::ostream& s) const
+{
+  s << "Phong BRDF: albedo=" << _albedo << ", sharpness=" << _sharpness;
+}