问题三十六：ray tracing中的Inverse Mapping（6）——汇总

最新推荐文章于 2024-10-25 17:00:00 发布

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#C++ #ray tracing #Inverse Mapping

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本文配置了一个包含三角形、四边形、椭圆平面等几何体的三维场景，并使用不同的材质进行渲染。通过设置摄像机参数，如视点、焦点距离等，实现了对场景的观察。

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

main.cpp

//triangle
        vec3 vertexes3_1[3];
        vertexes3_1[0] = vec3(-6.75, 0.0, 0.0);
        vertexes3_1[1] = vec3(-4.25, 0.0, 0.0);
        vertexes3_1[2] = vec3(-5.25, 2.5, 0.0);

//quadrilateral1
        vec3 vertexes4_1[4];
        vertexes4_1[0] = vec3(-6.5, 3.0 ,0.0);
        vertexes4_1[1] = vec3(-1.5, 3.0 ,0.0);
        vertexes4_1[2] = vec3(-1.5, 5.5 ,0.0);
        vertexes4_1[3] = vec3(-6.5, 5.5 ,0.0);
//quadrilateral2
        vec3 vertexes4_2[4];
        vertexes4_2[0] = vec3(-1.25, 3.0 ,0.0);
        vertexes4_2[1] = vec3(3.75, 3.0 ,0.0);
        vertexes4_2[2] = vec3(3.0, 5.5 ,0.0);
        vertexes4_2[3] = vec3(-0.0, 4.0 ,0.0);

        hitable *list[8];
        list[0] = new sphere(vec3(0.0,-100,0), 100, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[1] = new sphere(vec3(-2.75, 1.25, 0), 1.25, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[2] = new polygon(vertexes3_1, 3, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[3] = new polygon(vertexes4_1, 4, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[4] = new polygon(vertexes4_2, 4, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[5] = new elliptic_plane(vec3(0.0, 1.25, 0), vec3(0, 0, 1), 1.25, 1.25, 1.25, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[6] = new quadratic(vec3(2.75, 1.25, 0), 1.25, 1.25, 1.25, 0, 1, 1.25, new lambertian(vec3(0.8, 0.8, 0.0)));
        list[7] = new quadratic(vec3(5.5, 2.5, 0), 1.25, 2.5, 1.25, -1, 0, 2.5, new lambertian(vec3(0.8, 0.8, 0.0)));

        hitable *world = new hitable_list(list,8);

        vec3 lookfrom(0, 2.5, 20);
        vec3 lookat(0, 2.5, 0);
        float dist_to_focus = (lookfrom - lookat).length();
        float aperture = 0.0;
        camera cam(lookfrom, lookat, vec3(0,1,0), 20, float(nx)/float(ny), aperture, 0.7*dist_to_focus);

输出图片：

uv原图：