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Camera view geometry

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This commit is contained in:
Armin Friedl 2022-07-30 20:50:18 +02:00
parent 0a0080ce80
commit b8bdd91e40
2 changed files with 23 additions and 20 deletions
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40
rtiww/src/camera.h
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@ -5,29 +5,31 @@
class camera { class camera {
public: public:
camera() { camera(double vfov /*vertical field-of-view in degrees*/, double aspect_ratio) {
auto aspect_ratio = 16.0 / 9.0;
auto viewport_height = 2.0;
auto viewport_width = aspect_ratio * viewport_height;
auto focal_length = 1.0;
origin = point3(0, 0, 0); auto theta = degrees_to_radians(vfov);
horizontal = vec3(viewport_width, 0.0, 0.0); auto h = tan(theta / 2);
vertical = vec3(0.0, viewport_height, 0.0); auto viewport_height = 2.0 * h;
lower_left_corner = auto viewport_width = aspect_ratio * viewport_height;
origin - horizontal / 2 - vertical / 2 - vec3(0, 0, focal_length); auto focal_length = 1.0;
}
ray get_ray(double u, double v) const { origin = point3(0, 0, 0);
return ray(origin, horizontal = vec3(viewport_width, 0.0, 0.0);
lower_left_corner + u * horizontal + v * vertical - origin); vertical = vec3(0.0, viewport_height, 0.0);
} lower_left_corner =
origin - horizontal / 2 - vertical / 2 - vec3(0, 0, focal_length);
}
ray get_ray(double u, double v) const {
return ray(origin,
lower_left_corner + u * horizontal + v * vertical - origin);
}
private: private:
point3 origin; point3 origin;
point3 lower_left_corner; point3 lower_left_corner;
vec3 horizontal; vec3 horizontal;
vec3 vertical; vec3 vertical;
}; };
#endif // CAMERA_H_ #endif // CAMERA_H_

3
rtiww/src/main.cpp
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@ -54,11 +54,12 @@ int main() {
make_shared<sphere>(point3(0.0, -100.5, -1.0), 100.0, material_ground)); make_shared<sphere>(point3(0.0, -100.5, -1.0), 100.0, material_ground));
world.add(make_shared<sphere>(point3(0.0, 0.0, -1.0), 0.5, material_center)); world.add(make_shared<sphere>(point3(0.0, 0.0, -1.0), 0.5, material_center));
world.add(make_shared<sphere>(point3(-1.0, 0.0, -1.0), 0.5, material_left)); world.add(make_shared<sphere>(point3(-1.0, 0.0, -1.0), 0.5, material_left));
world.add(make_shared<sphere>(point3(-1.0, 0.0, -1.0), -0.4, material_left));
world.add(make_shared<sphere>(point3(1.0, 0.0, -1.0), 0.5, material_right)); world.add(make_shared<sphere>(point3(1.0, 0.0, -1.0), 0.5, material_right));
// Camera // Camera
camera cam; camera cam(90, aspect_ratio);
// Render // Render