64 lines
1.7 KiB
C++
Executable File
64 lines
1.7 KiB
C++
Executable File
#include "rtweekend.h"
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#include "hittable_list.h"
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#include "sphere.h"
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#include "colour.h"
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#include <iostream>
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const double ASPECT_RATIO = 16.0 / 9.0;
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const int WIDTH = 384;
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const int HEIGHT = static_cast<int>(WIDTH / ASPECT_RATIO);
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colour ray_colour(const ray& r, const hittable& world)
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{
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hit_record rec;
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if (world.hit(r, 0, infinity, rec))
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{
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return 0.5 * (rec.normal + colour(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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auto a = colour(1.0, 0.5, 0.6);
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auto b = colour(0.0, 0.0, 0.0);
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return lerp(a, b, t);
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}
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int main()
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{
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std::cout << "P3\n" << WIDTH << ' ' << HEIGHT << "\n255\n";
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auto viewport_height = 2.0;
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auto viewport_width = ASPECT_RATIO * viewport_height;
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auto focal_length = 1.0;
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auto origin = point3(0, 0, 0);
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auto horizontal = vec3(viewport_width, 0, 0);
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auto vertical = vec3(0, viewport_height, 0);
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auto lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0,0,focal_length);
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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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for (int y = HEIGHT - 1; y >= 0; --y)
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{
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std::cerr << "\rScanlines remaining: " << y << ' ' << std::flush;
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for (int x = 0; x < WIDTH; ++x)
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{
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auto u = double(x) / (WIDTH-1);
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auto v = double(y) / (HEIGHT-1);
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ray r(origin, lower_left_corner + u*horizontal + v*vertical - origin);
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colour pixel_colour = ray_colour(r, world);
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write_colour(std::cout, pixel_colour);
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}
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}
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std::cerr << "\nDone." << std::endl;
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}
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