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diff --git a/hw2/include/vec3d.h b/hw2/include/vec3d.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 _VEC3D_H_
+#define _VEC3D_H_
+
+#include <ostream>
+#include <cmath>
+
+class vec3d {
+ public:
+  /////////////
+  // Typedef //
+  /////////////
+  typedef float             value_type;
+  typedef value_type&       reference;
+  typedef const value_type& const_reference;
+  typedef value_type*       iterator;
+  typedef const value_type* const_iterator;
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  union {
+    struct { value_type x, y, z; };
+    value_type data[3];
+  };
+
+ public:
+  /////////////////
+  // Constructor //
+  /////////////////
+  explicit vec3d(const_reference value=0.0f);
+  vec3d(const_reference x, const_reference y, const_reference z);
+  vec3d(const vec3d& v);
+ 
+  ////////////////
+  // Inspectors //
+  ////////////////
+  static size_t size(void) { return 3; }
+
+  iterator begin(void);
+  const_iterator begin(void) const;
+  iterator end(void);
+  const_iterator end(void) const;
+
+  const_reference  operator[](size_t index) const;
+  reference        operator[](size_t index);
+
+  ///////////////
+  // Operators //
+  ///////////////
+  vec3d& operator=(const vec3d& v);
+
+  bool operator==(const vec3d& v) const;
+  bool operator!=(const vec3d& v) const;
+
+  vec3d operator-(void) const;
+  
+  vec3d operator+(const vec3d& v) const;
+  vec3d operator-(const vec3d& v) const;
+  vec3d operator*(const vec3d& v) const;
+  vec3d operator*(const_reference scale) const;
+  vec3d operator/(const vec3d& v) const;
+  vec3d operator/(const_reference scale) const;
+
+  vec3d& operator+=(const vec3d& v);
+  vec3d& operator-=(const vec3d& v);
+  vec3d& operator*=(const vec3d& v);
+  vec3d& operator*=(const_reference scale);
+  vec3d& operator/=(const vec3d& v);
+  vec3d& operator/=(const_reference scale);
+
+  /////////////
+  // Methods //
+  /////////////
+  value_type dot(const vec3d& v) const;
+  value_type squared_length(void) const;
+  value_type length(void) const;
+  value_type squared_distance(const vec3d& v) const;
+  value_type distance(const vec3d& v) const;
+
+  vec3d cross(const vec3d& v) const;
+
+  ///////////////
+  // Modifiers //
+  ///////////////
+  vec3d& abs(void);
+  vec3d& clamp(value_type lower=0.0f, value_type upper=1.0f); 
+  vec3d& normalize(void);
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void  swap(vec3d& a, vec3d& b) { return a._swap(b); }
+  friend vec3d  normalize(const vec3d& v) { return vec3d(v).normalize(); }
+  friend vec3d  abs(const vec3d& v) { return vec3d(v).abs(); }  
+  friend vec3d  clamp(const vec3d& v, value_type lower=0.0f, value_type upper=1.0f) { return vec3d(v).clamp(lower, upper); }
+  friend vec3d operator*(const_reference scale, const vec3d& v) { return (v*scale); }
+
+  friend std::ostream& operator<<(std::ostream& s, const vec3d& v)
+  {
+    s << "[" << v.x << "," << v.y << "," << v.z << "]";
+    return s;
+  }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const vec3d& v);
+  void _swap(vec3d& v);
+};
+
+#endif /* _VEC3D_H_ */