问题六十三：怎么用ray tracing画sphere sweeping图形（2）——teapot

63.5 组合rotational sweeping和sphere sweeping画一个teapot

----------------------------------------------main.cpp ------------------------------------------

main.cpp

 

//rotational sweeping
        vec3 ctrl_points_r[8] = {vec3(-4.0,  5.0,  0.0), vec3( 1.0,  3.5,  0.0),
                                 vec3( 1.0,  3.0,  0.0), vec3( 0.2,  2.5,  0.0),
                                 vec3( 3.0,  1.5,  0.0), vec3( 3.0, -1.5,  0.0),
                                 vec3( 2.0, -4.0,  0.0), vec3(-4.0, -4.0,  0.0)};

//sphere sweeping, teapot handle
        vec3 ctrl_points_sc_h[8] = {vec3( 1.0,  0.5,  0.0), vec3( 2.5,  0.5,  0.0),
                                    vec3( 4.0,  1.0,  0.0), vec3( 5.0,  0.8,  0.0),
                                    vec3( 4.0, -1.5,  0.0), vec3( 3.0, -2.0,  0.0),
                                    vec3( 2.5, -2.5,  0.0), vec3( 1.5, -1.5,  0.0)};
        vec3 ctrl_points_sr_h[8] = {vec3( 0.4,  0.0,  0.0), vec3( 0.4,  0.0,  0.0),
                                    vec3( 0.4,  0.0,  0.0), vec3( 0.4,  0.0,  0.0),
                                    vec3( 0.4,  0.0,  0.0), vec3( 0.4,  0.0,  0.0),
                                    vec3( 0.4,  0.0,  0.0), vec3( 0.4,  0.0,  0.0)};
//sphere sweeping, teapot spout
        vec3 ctrl_points_sc_s[8] = {vec3(-0.5, -1.0,  0.0), vec3(-2.5, -1.5,  0.0),
                                    vec3(-4.0, -1.5,  0.0), vec3(-4.5, -0.5,  0.0),
                                    vec3(-5.0,  0.5,  0.0), vec3(-6.0,  1.5,  0.0),
                                    vec3(-7.0,  1.5,  0.0), vec3(-8.0,  0.0,  0.0)};
        vec3 ctrl_points_sr_s[8] = {vec3( 1.0,  0.0,  0.0), vec3( 1.0,  0.0,  0.0),
                                    vec3( 0.8,  0.0,  0.0), vec3( 0.8,  0.0,  0.0),
                                    vec3( 0.4,  0.0,  0.0), vec3( 0.4,  0.0,  0.0),
                                    vec3( 0.2,  0.0,  0.0), vec3( 0.2,  0.0,  0.0)};
        hitable *list[3];
        list[0] = new sweeping_rotational(vec3( 0.0, 0.0,  0.0), ctrl_points_r, new lambertian(vec3(1.0, 0.0, 0.0)), 0.0);
        list[1] = new sweeping_sphere(ctrl_points_sc_h, ctrl_points_sr_h, new lambertian(vec3(1.0, 0.0, 0.0)));
        list[2] = new sweeping_sphere(ctrl_points_sc_s, ctrl_points_sr_s, new lambertian(vec3(1.0, 0.0, 0.0)));
        hitable *world = new hitable_list(list,3);

        vec3 lookfrom(0, 0, 20);
        vec3 lookat(0, 0, 0);
        float dist_to_focus = (lookfrom - lookat).length();
        float aperture = 0.0;
        camera cam(lookfrom, lookat, vec3(0,1,0), 40, float(nx)/float(ny), aperture, 0.7*dist_to_focus);

 

输出图形如下：

 

        vec3 lookfrom(0, 0, 20);

 

        vec3 lookfrom(10, 10, 10);

 

        vec3 lookfrom(15, 0, 15);

 

        vec3 lookfrom(15, 5, 15);