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diff --git a/hw3/include/triangle.h b/hw3/include/triangle.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 _TRIANGLE_H_
+#define _TRIANGLE_H_
+
+#include <array>
+#include <vector>
+#include <memory>
+#include <ostream>
+
+#include "ray.h"
+#include "vec2d.h"
+#include "vec3d.h"
+#include "boundingBox.h"
+
+class triangle {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  triangle(void);
+  triangle(const triangle& t);
+  triangle(triangle&& t);
+
+  triangle(const vec3d& v1, const vec3d& v2, const vec3d& v3);
+  triangle(size_t v1_idx, size_t v2_idx, size_t v3_idx, const std::shared_ptr<const std::vector<vec3d>>& vertex_list);
+
+  triangle(const vec3d& v1, const vec3d& v2, const vec3d& v3,
+	   const vec3d& n1, const vec3d& n2, const vec3d& n3);
+  triangle(size_t v1_idx, size_t v2_idx, size_t v3_idx, const std::shared_ptr<const std::vector<vec3d>>& vertex_list,
+           size_t n1_idx, size_t n2_idx, size_t n3_idx, const std::shared_ptr<const std::vector<vec3d>>& normal_list);
+
+  triangle(const vec3d& v1, const vec3d& v2, const vec3d& v3,
+	   const vec2d& t1, const vec2d& t2, const vec2d& t3);
+  triangle(size_t v1_idx, size_t v2_idx, size_t v3_idx, const std::shared_ptr<const std::vector<vec3d>>& vertex_list,
+	   size_t t1_idx, size_t t2_idx, size_t t3_idx, const std::shared_ptr<const std::vector<vec2d>>& texcoord_list);
+
+  triangle(const vec3d& v1, const vec3d& v2, const vec3d& v3,
+	   const vec3d& n1, const vec3d& n2, const vec3d& n3,
+	   const vec2d& t1, const vec2d& t2, const vec2d& t3);
+  triangle(size_t v1_idx, size_t v2_idx, size_t v3_idx, const std::shared_ptr<const std::vector<vec3d>>& vertex_list,
+	   size_t n1_idx, size_t n2_idx, size_t n3_idx, const std::shared_ptr<const std::vector<vec3d>>& normal_list,
+	   size_t t1_idx, size_t t2_idx, size_t t3_idx, const std::shared_ptr<const std::vector<vec2d>>& texcoord_list);
+
+  ////////////////
+  // Inspectors //
+  ////////////////
+  const vec3d& vertex(size_t index) const;
+  const vec3d& normal(size_t index) const;
+  const vec2d& textureCoordinate(size_t index) const;
+
+  bool hasPerVertexNormals(void) const;
+  bool hasPerVertexTextureCoordinates(void) const;
+
+  ///////////////
+  // Operators //
+  ///////////////
+  triangle& operator=(const triangle& t);  
+  triangle& operator=(triangle&& t); 
+
+  /////////////
+  // Methods //
+  /////////////
+  bool intersect(const ray& r, vec3d& barycentricCoord, float& t) const;
+
+  boundingBox boundingbox(void) const;
+  vec3d vertex(const vec3d& barycentricCoord) const;
+  vec3d normal(void) const;
+  vec3d shadingAxis(void) const;
+  vec3d normal(const vec3d& barycentricCoord) const;
+  vec2d textureCoordinate(const vec3d& barycentricCoord) const;
+
+  vec3d sample(float r1, float r2, vec3d& barycentricCoord, float& pdf) const;
+  float area(void) const;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend void swap(triangle& a, triangle& b) { a._swap(b); }
+  
+  friend std::ostream& operator<<(std::ostream& s, const triangle& t)
+  {
+    s << "Triangle: v=(" << t.vertex(0)            << "," << t.vertex(1)            << "," << t.vertex(2)            << ")";
+    if(t._normal_list) 
+      s           << ", n=(" << t.normal(0)            << "," << t.normal(1)            << "," << t.normal(2)            << ")";
+    if(t._textureCoord_list) 
+      s           << ", t=(" << t.textureCoordinate(0) << "," << t.textureCoordinate(1) << "," << t.textureCoordinate(2) << ")";
+    return s;
+  }
+
+private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  void _assign(const triangle& t);
+  void _swap(triangle& t); 
+
+  //////////////////
+  // Data Members //
+  //////////////////
+  std::array<size_t, 3> _vertex_idx;
+  std::array<size_t, 3> _normal_idx;
+  std::array<size_t,3 > _textureCoord_idx;
+  std::shared_ptr<const std::vector<vec3d>> _vertex_list;
+  std::shared_ptr<const std::vector<vec3d>> _normal_list;
+  std::shared_ptr<const std::vector<vec2d>> _textureCoord_list;
+};
+
+#endif /* _TRIANGLE_H_ */