Added presentations from EVI 2017

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

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+#pragma once
+#ifndef PLANE_HPP
+#define PLANE_HPP
+
+#include <glm/glm.hpp>
+
+#include "figure.hpp"
+
+using glm::vec3;
+using glm::normalize;
+
+class Plane : public Figure {
+public:
+  vec3 m_point;
+  vec3 m_normal;
+  
+  Plane(Material * mat = NULL): Figure(mat), m_point(vec3(0.0f)), m_normal(vec3(0.0f, 0.0f, 1.0f)) {
+    calculate_inv_area();
+  }
+
+  Plane(float x, float y, float z, float nx, float ny, float nz, Material * mat = NULL):
+    Figure(mat),
+    m_point(vec3(x, y, z)),
+    m_normal(normalize(vec3(nx, ny, nz)))
+  {
+    calculate_inv_area();
+  }
+
+  Plane(vec3 _p, vec3 _n, Material * mat = NULL): Figure(mat), m_point(_p), m_normal(normalize(_n)) { }
+
+  virtual ~Plane() { }
+
+  virtual bool intersect(Ray & r, float & t) const;
+  virtual vec3 normal_at_int(Ray & r, float & t) const;
+  virtual vec3 sample_at_surface() const;
+
+protected:
+  virtual void calculate_inv_area();
+};
+
+
+#endif