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Defocus blur

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This commit is contained in:
Armin Friedl 2022-07-30 21:19:33 +02:00
parent 01d3166ae2
commit bc35873a48
3 changed files with 45 additions and 23 deletions
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52
rtiww/src/camera.h
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@ -5,34 +5,42 @@
class camera { class camera {
public: public:
camera(point3 lookfrom, point3 lookat, vec3 vup, double vfov /*vertical field-of-view in degrees*/, camera(point3 lookfrom, point3 lookat, vec3 vup,
double aspect_ratio) { double vfov, // vertical field-of-view in degrees
double aspect_ratio, double aperture, double focus_dist) {
auto theta = degrees_to_radians(vfov); auto theta = degrees_to_radians(vfov);
auto h = tan(theta / 2); auto h = tan(theta / 2);
auto viewport_height = 2.0 * h; auto viewport_height = 2.0 * h;
auto viewport_width = aspect_ratio * viewport_height; auto viewport_width = aspect_ratio * viewport_height;
auto w = unit_vector(lookfrom - lookat); w = unit_vector(lookfrom - lookat);
auto u = unit_vector(cross(vup, w)); u = unit_vector(cross(vup, w));
auto v = cross(w, u); v = cross(w, u);
origin = lookfrom; origin = lookfrom;
horizontal = viewport_width * u; horizontal = focus_dist * viewport_width * u;
vertical = viewport_height * v; vertical = focus_dist * viewport_height * v;
lower_left_corner = origin - horizontal/2 - vertical/2 - w; lower_left_corner = origin - horizontal / 2 - vertical / 2 - focus_dist * w;
}
ray get_ray(double s, double t) const { lens_radius = aperture / 2;
return ray(origin, }
lower_left_corner + s*horizontal + t*vertical - origin);
} ray get_ray(double s, double t) const {
vec3 rd = lens_radius * random_in_unit_disk();
vec3 offset = u * rd.x() + v * rd.y();
return ray(origin + offset, lower_left_corner + s * horizontal +
t * vertical - origin - offset);
}
private: private:
point3 origin; point3 origin;
point3 lower_left_corner; point3 lower_left_corner;
vec3 horizontal; vec3 horizontal;
vec3 vertical; vec3 vertical;
vec3 u, v, w;
double lens_radius;
}; };
#endif // CAMERA_H_ #endif // CAMERA_H_

7
rtiww/src/main.cpp
View file

@ -59,7 +59,12 @@ int main() {
// Camera // Camera
camera cam(point3(-2,2,1), point3(0,0,-1), vec3(0,1,0), 90, aspect_ratio); point3 lookfrom(3, 3, 2);
point3 lookat(0, 0, -1);
vec3 vup(0, 1, 0);
auto dist_to_focus = (lookfrom - lookat).length();
auto aperture = 2.0;
camera cam(lookfrom, lookat, vup, 20, aspect_ratio, aperture, dist_to_focus);
// Render // Render

9
rtiww/src/vec3.h
View file

@ -131,4 +131,13 @@ vec3 refract(const vec3 &v, const vec3 &n, double etai_over_etat) {
return r_out_perp + r_out_parallel; return r_out_perp + r_out_parallel;
} }
vec3 random_in_unit_disk() {
while (true) {
auto p = vec3(random_double(-1, 1), random_double(-1, 1), 0);
if (p.length_squared() >= 1)
continue;
return p;
}
}
#endif // RTIWW_VEC3_H #endif // RTIWW_VEC3_H