53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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#pragma once
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#include "rtweekend.h"
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#include "image.h"
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class camera
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{
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public:
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camera(
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point3 lookfrom,
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point3 lookat,
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vec3 vup,
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double vfov, // vertical field of view in degrees
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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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auto theta = degrees_to_radians(vfov);
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auto h = tan(theta/2);
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auto viewport_height = 2.0 * h;
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auto viewport_width = aspect_ratio * viewport_height;
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w_ = unit_vector(lookfrom - lookat);
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u_ = unit_vector(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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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(
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origin_ + offset,
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lower_left_corner_ + s*horizontal_ + t*vertical_ - origin_ - offset);
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}
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private:
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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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};
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