Ray Tracing in One Weekend Part3
2022/7/8 23:20:23
本文主要是介绍Ray Tracing in One Weekend Part3,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
完成到第七章抗锯齿的内容
#include <iostream> #include<fstream> #include<string> #include "v3d.h" #include "ray.h" #include "color.h" #include "rtweekend.h" #include "hittable_list.h" #include "sphere.h" #include"camera.h" using namespace std; // Type aliases for vec3 using point3 = vec3; // 3D point using color = vec3; // RGB color double hit_sphere(const point3& center, double radius, const ray& r) { vec3 oc = r.origin() - center; auto a = r.direction().length_squared();//t2b⋅b+2tb⋅(A−C)+(A−C)⋅(A−C)−r2=0 函数关于t, P(t)=A+tb auto half_b = dot(oc, r.direction()); auto c = oc.length_squared() - radius * radius; auto discriminant = half_b * half_b - a * c; if (discriminant < 0) { return -1.0; } else { return (-half_b - sqrt(discriminant)) / a; } } color ray_color(const ray& r ,const hittable& world) { hit_record rec; if (world.hit(r, 0, infinity, rec)){//如果打中了球,在球的范围内,就变成彩色 return 0.5 * (rec.normal + color(1, 1, 1)); } vec3 unit_direction = unit_vector(r.direction()); //显示蓝色背景 auto back = 0.5 * (unit_direction.y() + 1.0); return (1.0 - back) * color(1.0, 1.0, 1.0) + back * 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); const int sample_per_pixel = 100;//采样次数 // World hittable_list world; world.add(make_shared<sphere>(point3(0, 0, -1), 0.5)); world.add(make_shared<sphere>(point3(0, -100.5, -1), 100)); // Camera camera cam;//定义函数放到头文件里面了 // Render ofstream file("graph1-2.ppm"); file << "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) { color pix_color(0, 0, 0); for (int s = 0; s < sample_per_pixel; s++) {//采样100次,即图片的每个点位都发出的光通过random随机不同方向,取样100次求平均值 auto u = (i + random_double()) / (image_width - 1); auto v = (j + random_double()) / (image_height - 1); ray r = cam.get_ray(u, v); pix_color += ray_color(r, world); } write_color(file, pix_color,sample_per_pixel); } } std::cerr << "\nDone.\n"; }
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