Added refractions and fresnel.

ray.hpp

@@ -10,10 +10,13 @@ class Ray {
 public:
   vec3 m_direction;
   vec3 m_origin;
+  float m_ref_index;
 
-  Ray(): m_direction(vec3(0.0f, 0.0f, -1.0f)), m_origin(vec3(0.0f)) { }
-  Ray(float dx, float dy, float dz, float ox, float oy, float oz): m_direction(vec3(dx, dy, dz)), m_origin(vec3(ox, oy, oz)) {}
-  Ray(vec3 _d, vec3 _o): m_direction(_d), m_origin(_o) { }
+  Ray(): m_direction(vec3(0.0f, 0.0f, -1.0f)), m_origin(vec3(0.0f)), m_ref_index(1.0f) { }
+  Ray(float dx, float dy, float dz, float ox, float oy, float oz, float _r = 1.0f): m_direction(vec3(dx, dy, dz)),
+										    m_origin(vec3(ox, oy, oz)),
+										    m_ref_index(_r) { }
+  Ray(vec3 _d, vec3 _o, float _r = 1.0f): m_direction(_d), m_origin(_o), m_ref_index(_r) { }
 };
 
 #endif