Added refractions and fresnel.

directional_light.hpp

@@ -10,14 +10,12 @@ public:
     m_position = vec3(0.0f);
     m_diffuse = vec3(1.0f);
     m_specular = vec3(1.0f);
-    m_ambient = vec3(0.05f);
   }
 
-  DirectionalLight(vec3 _p, vec3 _d, vec3 _s, vec3 _a) {
+  DirectionalLight(vec3 _p, vec3 _d, vec3 _s) {
     m_position = _p;
     m_diffuse = _d;
     m_specular = _s;
-    m_ambient = _a;
   }
 
   virtual vec3 shade(vec3 normal, Ray & r, Material & m) const;