52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
#include <iostream>
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#include "color.h"
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#include "vec3.h"
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#include "ray.h"
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#include "util.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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Color ray_color(const Ray& r, const Hittable& world) {
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hit_record rec;
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if (world.hit(r, 0, infinity, rec)) {
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return 0.5 * (rec.normal + Color(1,1,1));
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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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const auto aspect_ratio = 16.0 / 9.0;
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const int image_width = 1280;
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//const int image_width = 384;
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const int image_height = static_cast<int>(image_width / aspect_ratio);
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const int samples_per_pixel = 100;
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std::cout << "P3\n" << image_width << " " << image_height << "\n255\n";
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Hittable_list world;
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world.add(std::make_shared<Sphere>(Point3(0, 0, -1), 0.5));
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world.add(std::make_shared<Sphere>(Point3(0, -100.5, -1), 100));
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Camera cam;
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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 = double(i + random_double()) / (image_width - 1);
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auto v = double(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);
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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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