Added presentations from EVI 2017

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

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+#pragma once
+#ifndef CAMERA_HPP
+#define CAMERA_HPP
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "ray.hpp"
+
+using glm::mat4;
+using glm::vec2;
+using glm::vec3;
+using glm::normalize;
+using glm::lookAt;
+using glm::inverse;
+
+// Camera vector disposition:
+//   up^
+//     |
+//     |
+//  eye)-------->* look
+//
+class Camera {
+public:
+  vec3 m_eye;  // Eye position.
+  vec3 m_look; // Look-up position.
+  vec3 m_up;   // Up vector.
+
+  Camera(vec3 _e = vec3(0.0f), vec3 _l = vec3(0.0f, 0.0f, -1.0f), vec3 _u = vec3(0.0f, 1.0f, 0.0f)):
+    m_eye(_e),
+    m_look(_l),
+    m_up(normalize(_u)),
+    m_inv_view_matrix(inverse(lookAt(_e, _l, normalize(_u))))
+  { }
+
+  /**
+   * Restores the view matrix undoing any transformation.
+   */
+  void reset();
+
+  /**
+   * Translate the eye position.
+   */
+  void translate(vec3 t);
+
+  /**
+   * Rotate view direction around left vector (cross product of up vector and view direction).
+   */
+  void pitch(float angle);
+
+  /**
+   * Rotate view direction around up vector.
+   */
+  void yaw(float angle);
+
+  /**
+   * Rotate up vector around view direction.
+   */
+  void roll(float angle);
+
+  /**
+   * Apply the inverse view matrix to a ray to take it from view space to world space.
+   */
+  void view_to_world(Ray & r) const;
+
+private:
+  // Inverse view matrix.
+  mat4 m_inv_view_matrix;
+};
+
+#endif