40:初始图形学(12)

两个星期过去了，我们的图形学入门之旅也是迎来了终章。

最后就以一个完美的作品来作为纪念我们图形学学习的短暂结束。

我们设置main函数：

#include "rtweekend.h"

#include "camera.h"
#include "hittable.h"
#include "hittable_list.h"
#include "material.h"
#include "sphere.h"

int main(){
    hittable_list world;

    auto ground_material = make_shared<lambertian>(color(0.5,0.5,0.5));
    world.add(make_shared<sphere>(point3(0,-1000,0),1000,ground_material));

    for(int a = -11;a < 11;a++){
        for(int b = -11;b < 11;b++){
            auto choose_mat = random_double();
            point3 center(a + 0.9*random_double(), 0.2, b + 0.9*random_double());

            if((center - point3(4,0.2,0)).length() > 1.0){
                shared_ptr<material> sphere_material;

                if(choose_mat < 0.8){
                    //漫反射
                    auto albedo = color::random() * color::random();
                    sphere_material = make_shared<lambertian>(albedo);
                    world.add(make_shared<sphere>(center,0.2,sphere_material));
                }else if(choose_mat < 0.95) {
                    //金属
                    auto albedo = color::random(0.5,1);
                    auto fuzz = random_double(0,0.5);
                    sphere_material = make_shared<metal>(albedo,fuzz);
                    world.add(make_shared<sphere>(center,0.2,sphere_material));
                }else{
                    //玻璃
                    sphere_material = make_shared<dielectric>(1.5);
                    world.add(make_shared<sphere>(center,0.2,sphere_material));
                }
            }
        }
    }

    auto material1 = make_shared<dielectric>(1.5);
    world.add(make_shared<sphere>(point3(0,1,0),1.0,material1));

    auto material2 = make_shared<lambertian>(color(0.4, 0.2, 0.1));
    world.add(make_shared<sphere>(point3(-4, 1, 0), 1.0, material2));

    auto material3 = make_shared<metal>(color(0.7, 0.6, 0.5), 0.0);
    world.add(make_shared<sphere>(point3(4, 1, 0), 1.0, material3));

    camera cam;

    cam.aspect_ratio      = 16.0 / 9.0;
    cam.image_width       = 800;
    cam.samples_per_pixel = 100;
    cam.max_depth         = 50;


    cam.vfov     = 20;
    cam.lookfrom = point3(13,2,3);
    cam.lookat   = point3(0,0,0);
    cam.vup      = vec3(0,1,0);

    cam.defocus_angle = 0.6;
    cam.focus_dist    = 10.0;

    cam.render(world);
}

两个星期的学习，都在这张图片之中了