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diff --git a/hw4/include/intersectionPoint.h b/hw4/include/intersectionPoint.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 _INTERSECTIONPOINT_H_
+#define _INTERSECTIONPOINT_H_
+
+#include <memory>
+#include <ostream>
+
+#include "ray.h"
+#include "vec3d.h"
+#include "vec2d.h"
+#include "color.h"
+#include "constants.h"
+#include "lightSample.h"
+#include "transformation3d.h"
+#include "shaderProperties.h"
+#include "coordinateTransform.h"
+
+
+class intersectionPoint 
+{
+ public:
+  /////////////////
+  // Constructor //
+  /////////////////
+  intersectionPoint(void);
+  intersectionPoint(const ray& r, float rayParameter=+LARGE, const std::shared_ptr<const class shader_base>& shader=nullptr, const vec3d& normal=vec3d(0.0f, 0.0f, 1.0f), const vec3d& axis=vec3d(1.0f, 0.0f, 0.0f), const vec2d& textureCoordinate=vec2d(0.0f, 0.0f));
+  intersectionPoint(const intersectionPoint& ip);
+
+  ///////////////
+  // Operators //
+  ///////////////
+  intersectionPoint& operator=(const intersectionPoint& ip);
+
+  bool operator<(const intersectionPoint& ip) const;
+  bool operator>(const intersectionPoint& ip) const;
+  bool operator<(const lightSample& ls) const;
+  bool operator>(const lightSample& ls) const;
+
+  ////////////////
+  // Inspectors //
+  ////////////////
+  bool isHit(void) const;
+  bool hasShader(void) const;
+  shaderProperties getShaderProperties(void) const;
+  float distance(const intersectionPoint& ip) const;
+  const vec3d& position(void) const;
+  const vec3d& direction(void) const;
+  const vec2d& textureCoordinate(void) const;
+  const vec3d& normal(void) const;
+  coordinateTransformation shadingFrame(void) const;
+
+  //////////////
+  // Mutators //
+  //////////////
+  void transform(const transformation3d& t);
+  void inverseTransform(const transformation3d& t);
+
+  void transformShadingFrame(const transformation3d& sft);
+  void inverseTransformShadingFrame(const transformation3d& sft);
+
+  void setShader(const std::shared_ptr<const class shader_base>& shader);
+
+  /////////////
+  // Methods //
+  /////////////
+  color shade(const vec3d& out) const;
+  color shade(const lightSample& ls) const;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(intersectionPoint& a, intersectionPoint& b) { a._swap(b); }
+
+  friend bool operator<(const lightSample& ls, const intersectionPoint& ip) { return (ip > ls); }
+  friend bool operator>(const lightSample& ls, const intersectionPoint& ip) { return (ip < ls); }
+
+  friend std::ostream& operator<<(std::ostream& s, const intersectionPoint& ip)
+  {
+    if(ip._hit) s << "IntersectionPoint: ray=" << ip._ray << ", position=" << ip._position << " (parameter=" << ip._rayParameter << ", normal=" << ip._normal << ", shading axis=" << ip._axis << ", texture coordinate=" << ip._textureCoordinate;
+    else s << "IntersectionPoint: empty";
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const intersectionPoint& ip);
+  void _swap(intersectionPoint& ip);
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  ray _ray;
+  bool _hit;
+  float _rayParameter;
+  vec3d _position;
+  vec3d _normal, _axis;
+  vec2d _textureCoordinate;
+  std::shared_ptr<const class shader_base> _shader;
+};
+
+#endif /* _INTERSECTIONPOINT_H_ */