Added presentations from EVI 2017

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

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+#pragma once
+#ifndef RAY_HPP
+#define RAY_HPP
+
+#include <glm/vec3.hpp>
+
+using glm::vec3;
+
+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)), 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