52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
#ifndef CAMERA_H
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#define CAMERA_H
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#include "rtweekend.hpp"
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struct camera {
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/* Attributes */
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point3 origin;
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point3 lower_left_corner;
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vec3 horizontal;
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vec3 vertical;
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vec3 u,v,w;
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double lens_radius;
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/* Constructors */
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camera(point3 lookfrom,
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point3 lookat,
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vec3 vup,
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double vfov,
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double aspect_ratio,
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double aperture,
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double focus_dist)
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{
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double theta = degrees_to_radians(vfov);
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double h = tan(theta/2);
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double viewport_height = 2.0 * h;
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double viewport_width = aspect_ratio * viewport_height;
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w = normalize(lookfrom - lookat);
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u = normalize(cross(vup,w));
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v = cross(w, u);
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origin = lookfrom;
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horizontal = focus_dist * viewport_width * u;
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vertical = focus_dist * viewport_height * v;
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lower_left_corner = origin - horizontal/2 - vertical/2 - focus_dist*w;
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lens_radius = aperture/2;
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}
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/* Methods */
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ray get_ray(double s, double t) const
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{
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vec3 rd = lens_radius * random_in_unit_disk();
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vec3 offset = u * rd.x + v * rd.y;
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return ray(origin + offset, lower_left_corner + s*horizontal + t*vertical - origin - offset);
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};
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};
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#endif
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