cg-hw1/main.cpp

#include <fstream>
#include <iostream>
//#include "vec3.h"

using namespace std;

int main() {
    int width = 200;
    int height = 100;

    fstream file;
    file.open("ray.ppm", ios::out);

    file << "P3\n"
         << width << " " << height << "\n255\n";
    for (int j = height - 1; j >= 0; j--) {
        for (int i = 0; i < width; i++) {
            float r = float(i) / float(width);
            float g = float(j) / float(height);
            float b = 0.2;

            file << int(r * 255) << " " << int(g * 255) << " " << int(b * 255) << "\n";
        }
    }

    return 0;
}