60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#include "rtweekend.h"
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#include "color.h"
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#include "hittable_list.h"
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#include "sphere.h"
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#include "camera.h"
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#include <iostream>
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color ray_color(const ray& r, const hittable& world, int depth) {
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hit_record rec;
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// If we've exceeded the ray bounce limit, no more light is gathered.
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if (depth <= 0)
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return color(0, 0, 0);
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if (world.hit(r, 0, infinity, rec)) {
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point3 target = rec.p + rec.normal + random_in_unit_sphere();
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return 0.5 * ray_color(ray(rec.p, target - rec.p), world, depth-1);
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}
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vec3 unit_direction = unit_vector(r.direction());
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auto t = 0.5*(unit_direction.y() + 1.0);
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return (1.0 - t)*color(1.0, 1.0, 1.0) + t*color(0.5, 0.7, 1.0);
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}
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int main() {
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// Image
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const auto aspect_ratio = 16.0 / 9.0;
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const int image_width = 400;
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const int image_height = static_cast<int>(image_width / aspect_ratio);
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const int samples_per_pixel = 32;
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const int max_depth = 25;
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// World
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hittable_list world;
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world.add(make_shared<sphere>(point3(0, 0, -1), 0.5));
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world.add(make_shared<sphere>(point3(0, -100.5, -1), 100));
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// Camera
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camera cam;
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// Render
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std::cout<<"P3\n" <<image_width<<" "<<image_height<<"\n255\n";
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for (int j = image_height-1; j >= 0; --j) {
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std::cerr<<"\rScanlines remaining: "<<j<<" "<<std::flush;
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for (int i = 0; i < image_width; ++i) {
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color pixel_color(0, 0, 0);
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for (int s = 0; s < samples_per_pixel; ++s) {
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auto u = (i + random_double()) / (image_width-1);
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auto v = (j + random_double()) / (image_height-1);
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ray r = cam.get_ray(u, v);
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pixel_color += ray_color(r, world, max_depth);
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}
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write_color(std::cout, pixel_color, samples_per_pixel);
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}
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}
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std::cerr<<"\nDone.\n";
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}
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