Nigel/RaytracingInOneWeekend
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Movable lens

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Nigel Barink 2023-03-05 16:01:09 +01:00
parent 41082f0764
commit 3d06a33548
2 changed files with 32 additions and 20 deletions
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35
src/camera.h
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@ -3,20 +3,33 @@
class camera{
public:
camera(){
auto aspect_ratio = 16.0 / 9.0;
auto viewport_height = 2.0;
auto viewport_width = aspect_ratio * viewport_height;
auto focal_length = 1.0;
camera(
point3 lookfrom,
point3 lookat,
vec3 vup,
double vfov ,
double aspect_ratio
){
origin = point3(0,0,0);
horizontal = vec3(viewport_width, 0, 0);
vertical = vec3(0, viewport_height, 0);
lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0,0,focal_length);
auto theta = degrees_to_radians(vfov);
auto h = tan(theta/2);
auto viewport_height = 2.0 * h;
auto viewport_width = aspect_ratio * viewport_height;
auto w = unit_vector(lookfrom - lookat);
auto u = unit_vector(cross(vup, w));
auto v = cross(w,u);
origin = lookfrom;
horizontal = viewport_width * u;
vertical = viewport_height * v;
lower_left_corner = origin - horizontal/2 - vertical/2 - w;
}
ray get_ray(double u, double v) const {
return ray(origin, lower_left_corner + u * horizontal + v*vertical - origin);
ray get_ray(double s, double t) const {
return ray(origin, lower_left_corner + s * horizontal + t*vertical - origin);
}
private:

13
src/program.cpp
View File

@ -45,16 +45,15 @@ int main ()
auto material_left = make_shared<dielectric>(1.5);
auto material_right = make_shared<metal>(color(0.8, 0.6, 0.2), 0.0);
world.add(make_shared<sphere>(point3(0,-100.5,-1), 100.0, material_ground));
world.add(make_shared<sphere>(point3(0,0,-1), 0.5, material_center));
world.add(make_shared<sphere>(point3(-1.0, 0.0, -1), 0.5, material_left));
world.add(make_shared<sphere>(point3(-1.0, 0.0, -1), -0.4, material_left));
world.add(make_shared<sphere>(point3(1.0, 0.0, -1), 0.5, material_right));
world.add(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(-1.0, 0.0, -1.0), 0.5, material_left));
world.add(make_shared<sphere>(point3(-1.0, 0.0, -1.0), -0.45, material_left));
world.add(make_shared<sphere>(point3( 1.0, 0.0, -1.0), 0.5, material_right));
// Camera
camera cam;
camera cam(point3(-2,2,1), point3(0,0,-1), vec3(0,1,0), 20, aspect_ratio);
// Render
std::cout<< "P3\n" << image_width << ' ' << image_height << "\n255\n";