Added presentations from EVI 2017

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

@@ -0,0 +1,23 @@
+#pragma once
+#ifndef POINT_LIGHT_HPP
+#define POINT_LIGHT_HPP
+
+#include "light.hpp"
+
+class PointLight: public InfinitesimalLight {
+public:
+  float m_const_att;
+  float m_lin_att;
+  float m_quad_att;
+
+  PointLight(): InfinitesimalLight(), m_const_att(1.0f), m_lin_att(0.0f), m_quad_att(0.0f) { }
+
+  PointLight(vec3 _p, vec3 _d, vec3 _s, float _c, float _l, float _q): InfinitesimalLight(_p, _d, _s), m_const_att(_c), m_lin_att(_l), m_quad_att(_q) { }
+
+  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