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diff --git a/hw6/src/brdfSample.cpp b/hw6/src/brdfSample.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 "brdfSample.h"
+
+//////////////////
+// Constructors //
+//////////////////
+brdfSample::brdfSample(void)
+{
+  _out = vec3d(0.0f, 0.0f, 1.0f);
+  _pdf = 0.0f;
+  _reflectance = color(0.0f);
+}
+
+brdfSample::brdfSample(const vec3d& out, const float pdf, const color& reflectance)
+{
+  _out = out;
+  _pdf = std::max(pdf, 0.0f);
+  _reflectance = reflectance;
+}
+
+
+brdfSample::brdfSample(const brdfSample& bs)
+{
+  _out = bs._out;
+  _pdf = bs._pdf;
+  _reflectance = bs._reflectance;
+}
+
+
+///////////////
+// Operators //
+///////////////
+brdfSample& brdfSample::operator=(const brdfSample& bs)
+{
+  _assign(bs);
+  return *this;
+}
+
+
+brdfSample brdfSample::operator*(float pdf) const
+{
+  return brdfSample(_out, _pdf * pdf, _reflectance);
+}
+
+
+brdfSample& brdfSample::operator*=(float pdf)
+{
+  _pdf *= pdf;
+  return *this;
+}
+  
+
+////////////////
+// Inspectors //
+////////////////
+const vec3d& brdfSample::exitantDirection(void) const
+{
+  return _out;
+}
+
+
+float brdfSample::pdf(void) const
+{
+  return _pdf;
+}
+
+
+const color& brdfSample::reflectance(void) const
+{
+  return _reflectance;
+}
+
+
+/////////////
+// Methods //
+/////////////
+brdfSample& brdfSample::transform(const transformation3d& t)
+{
+  _out = t.transformDirection(_out);
+  return *this;
+}
+
+
+brdfSample& brdfSample::inverseTransform(const transformation3d& t)
+{
+  _out = t.inverseTransformDirection(_out);
+  return *this;
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void brdfSample::_swap(brdfSample& bs)
+{
+  swap(_out, bs._out);
+  std::swap(_pdf, bs._pdf);
+  swap(_reflectance, bs._reflectance);
+}
+
+
+void brdfSample::_assign(const brdfSample& bs)
+{
+  _out = bs._out;
+  _pdf = bs._pdf;
+  _reflectance = bs._reflectance;
+}
+