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diff --git a/hw5/src/environmentMap.cpp b/hw5/src/environmentMap.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 "environmentMap.h"
+
+
+//////////////////
+// Constructors //
+//////////////////
+environmentMap::environmentMap(const std::shared_ptr<const texture_base>& map, const transformation3d& transform)
+{
+  _map = map;
+  _transform = transform;
+}
+
+
+environmentMap::environmentMap(const environmentMap& src)
+{
+  _map = src._map;
+  _transform = src._transform;
+}
+
+
+///////////////
+// Operators //
+///////////////
+environmentMap environmentMap::operator=(const environmentMap& src)
+{
+  _assign(src);
+  return *this;
+}
+
+
+color environmentMap::operator()(const vec3d& direction) const
+{
+  // HW5: Implement this. Given a 'direction' return the corresponding
+  //      texel from the _map. The environment map uses spherical coordinates
+  //      for mapping a direction to a (phi, theta) pair (which are subsequently
+  //      mapped to pixel coordinates. (x,y,z) = (cos(phi)*sin(theta),
+  //      sin(phi)*sin(theta), cos(theta)).
+  // Modifies: nothing
+  // Returns: color
+  vec3d reflect_dir = _transform.inverseTransformDirection(direction); // invert
+  float phi = (acos(reflect_dir.z) + PI) / PI; // make positive, scale: 180
+  float theta = atan2(reflect_dir.y, reflect_dir.x) / (2 * PI); // scale: 360
+  return (*_map)(vec2d(theta, phi)); // return texel
+}
+
+
+///////////////////////
+// Protected Methods //
+///////////////////////
+void environmentMap::_assign(const environmentMap& src)
+{
+  if(&src == this) return;
+
+  _map = src._map;
+  _transform = src._transform;
+}
+
+
+void environmentMap::_swap(environmentMap& swp)
+{
+  std::swap(_map, swp._map);
+  swap(_transform, swp._transform);
+}
+
+
+void environmentMap::_print(std::ostream& s) const
+{
+  s << "Environment Map (" << *_map << ", " << _transform << ")";
+}