Added presentations from EVI 2017

EVI - 2017/EVI 21/EVIray/directional_light.hpp

@@ -0,0 +1,23 @@
+#pragma once
+#ifndef DIRECTIONAL_LIGHT_HPP
+#define DIRECTIONAL_LIGHT_HPP
+
+#include <glm/glm.hpp>
+
+#include "light.hpp"
+
+using glm::normalize;
+
+class DirectionalLight: public InfinitesimalLight {
+public:
+  DirectionalLight(): InfinitesimalLight() { }
+
+  DirectionalLight(vec3 _p, vec3 _d, vec3 _s): InfinitesimalLight(normalize(_p), _d, _s) { }
+
+  virtual vec3 direction(vec3 point) const;
+  virtual float distance(vec3 point) const;
+  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+};
+
+#endif