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diff --git a/hw6/src/surfaceSample.cpp b/hw6/src/surfaceSample.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 "surfaceSample.h"
+
+//////////////////
+// Constructors //
+//////////////////
+surfaceSample::surfaceSample(void)
+{
+  _position = vec3d();
+  _normal = vec3d();
+  _pdf = 0.0f;
+}
+
+
+surfaceSample::surfaceSample(const vec3d& position, const vec3d& normal, const float pdf)
+{
+  _position = position;
+  _normal = normal;
+  _pdf = std::max(pdf, 0.0f);
+}
+
+
+surfaceSample::surfaceSample(const surfaceSample& ss)
+{
+  _position = ss._position;
+  _normal = ss._normal;
+  _pdf = ss._pdf;
+}
+
+
+///////////////
+// Operators //
+///////////////
+surfaceSample& surfaceSample::operator=(const surfaceSample& ss)
+{
+  _assign(ss);
+  return *this;
+}
+  
+
+surfaceSample surfaceSample::operator*(float pdf) const
+{
+  return surfaceSample(_position, _normal, _pdf * pdf);
+}
+
+
+surfaceSample& surfaceSample::operator*=(float pdf)
+{
+  _pdf *= pdf;
+  return *this;
+}
+
+
+////////////////
+// Inspectors //
+////////////////
+const vec3d& surfaceSample::position(void) const
+{
+  return _position;
+}
+
+
+const vec3d& surfaceSample::normal(void) const
+{
+  return _normal;
+}
+
+
+float surfaceSample::pdf(void) const
+{
+  return _pdf;
+}
+
+
+/////////////
+// Methods //
+/////////////
+surfaceSample& surfaceSample::transform(const transformation3d& t)
+{
+  _position = t.transformPoint(_position);
+  _normal = t.transformNormal(_normal);
+  return *this;
+}
+
+
+surfaceSample& surfaceSample::inverseTransform(const transformation3d& t)
+{
+  _position = t.inverseTransformPoint(_position);
+  _normal = t.inverseTransformNormal(_normal);
+  return *this;
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void surfaceSample::_swap(surfaceSample& s)
+{
+  swap(_position, s._position);
+  swap(_normal, s._normal);
+  std::swap(_pdf, s._pdf);
+}
+
+
+void surfaceSample::_assign(const surfaceSample& s)
+{
+  _position = s._position;
+  _normal = s._normal;
+  _pdf = s._pdf;
+}