49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
#include "color.h"
|
|
#include "ray.h"
|
|
#include "vector3.h"
|
|
|
|
#include <iostream>
|
|
|
|
color ray_color(const ray& r){
|
|
vec3 unit_direction = unit_vector(r.direction());
|
|
auto t = 0.5*(unit_direction.y() + 1.0);
|
|
return (1.0-t)*color(1.0, 1.0, 1.0) + t*color(0.5,0.7,1.0);
|
|
}
|
|
|
|
|
|
int main ()
|
|
{
|
|
// Image
|
|
const auto aspect_ratio = 16.0 /9.0;
|
|
const int image_width = 400;
|
|
const int image_height = static_cast<int>(image_width /aspect_ratio);
|
|
|
|
|
|
// Camera
|
|
auto viewport_height = 2.0;
|
|
auto viewport_width = aspect_ratio * viewport_height;
|
|
auto focal_length = 1.0;
|
|
|
|
auto origin = point3(0,0,0);
|
|
auto horizontal = vec3(viewport_width, 0, 0);
|
|
auto vertical = vec3(0, viewport_height, 0);
|
|
auto lower_left_corner = origin - horizontal/2 - vertical/2 - vec3(0,0,focal_length);
|
|
|
|
// Render
|
|
std::cout<< "P3\n" << image_width << ' ' << image_height << "\n255\n";
|
|
for (int j = image_height-1; j >= 0; --j)
|
|
{
|
|
std::cerr << "\rScanlines remaining: " << j << ' ' << std::flush;
|
|
for(int i = 0; i < image_width; ++i)
|
|
{
|
|
auto u = double(i) / (image_width-1);
|
|
auto v = double(j) / (image_height-1);
|
|
ray r(origin, lower_left_corner+u*horizontal + v* vertical -origin);
|
|
color pixel_color = ray_color(r);
|
|
write_color(std::cout , pixel_color);
|
|
}
|
|
}
|
|
|
|
std::cerr << "\nDone.\n";
|
|
return 0;
|
|
} |