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#ifndef CAMERA_H
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#define CAMERA_H
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#include "GL/glut.h"
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#include "CGLA/Vec2f.h"
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#include "CGLA/Vec3f.h"
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#include "Geometry/Ray.h"
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const float FAR_PLANE = 1.0e8;
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class Camera
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{
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public:
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Camera(const CGLA::Vec3f& _eye, // Eye point (camera position)
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const CGLA::Vec3f& _focus, // Focus point
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const CGLA::Vec3f& _up, // Up vector
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float fd) // Focal distance
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: eye(_eye), focus(_focus), up(_up), focal_dist(fd)
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{
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#ifndef M_1_PI
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const double M_1_PI = 0.318309886184;
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#endif
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line_of_sight = focus - eye;
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// Calculate view plane normal and basis
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vp_normal = normalize(line_of_sight);
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assert(dot(vp_normal, normalize(up)) < 0.99999999);
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vp_axes[0] = normalize(cross(vp_normal, up));
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vp_axes[1] = normalize(cross(vp_axes[0], vp_normal));
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// Account for focal distance
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vp_normal *= focal_dist;
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// Calculate field of view (using the pinhole camera model)
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float tmp = atan(1.0/(2.0 * focal_dist));
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fov = 360.0 * M_1_PI * tmp;
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}
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void set(const CGLA::Vec3f& _eye, // Eye point (camera position)
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const CGLA::Vec3f& _focus, // Focus point
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const CGLA::Vec3f& _up, // Up vector
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float fd) // Focal distance
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{
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#ifndef M_1_PI
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const double M_1_PI = 0.318309886184;
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#endif
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eye = _eye;
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focus = _focus;
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up = _up;
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focal_dist = fd;
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line_of_sight = focus - eye;
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// Calculate view plane normal and basis
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vp_normal = normalize(line_of_sight);
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assert(dot(vp_normal, normalize(up)) < 0.99999999);
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vp_axes[0] = normalize(cross(vp_normal, up));
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vp_axes[1] = normalize(cross(vp_axes[0], vp_normal));
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// Account for focal distance
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vp_normal *= focal_dist;
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// Calculate field of view (using the pinhole camera model)
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float tmp = atan(1.0/(2.0 * focal_dist));
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fov = 360.0 * M_1_PI * tmp;
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}
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/// Get direction of viewing ray from image coords.
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CGLA::Vec3f get_ray_dir(const CGLA::Vec2f& coords) const
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{
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// vp_normal is multiplied by focal_dist in the constructor
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return vp_normal + vp_axes[0]*coords[0] + vp_axes[1]*coords[1];
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}
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/// Return position of camera.
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const CGLA::Vec3f& get_position() const { return eye; }
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/// Return the ray corresponding to a set of image coords
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Geometry::Ray get_ray(const CGLA::Vec2f& coords) const
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{
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return Geometry::Ray(eye, normalize(get_ray_dir(coords)));
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}
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float get_fov() const { return fov; }
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float get_focal_dist() const { return focal_dist; }
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// OpenGL
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void glSetPerspective(float width, float height) const
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{
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GLdouble aspect = width/height;
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(fov, aspect, focal_dist, FAR_PLANE);
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glMatrixMode(GL_MODELVIEW);
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}
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void glSetCamera() const
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{
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gluLookAt(eye[0], eye[1], eye[2],
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focus[0], focus[1], focus[2],
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up[0], up[1], up[2]);
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}
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private:
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CGLA::Vec3f eye, focus, up;
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float focal_dist;
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float fov;
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float phot_rad;
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CGLA::Vec3f line_of_sight;
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// Basis of camera coordinate system (vp - view-plane)
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CGLA::Vec3f vp_normal;
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CGLA::Vec3f vp_axes[2];
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};
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#endif
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