作业2：三角形覆盖顺序不对

[RickJager]

完成作业2时我的结果是下图（和原作业要求不符合）

查看了一下投影矩阵，发现传入的znear和zfar是正数，我感觉自己是不是在这里错了，下面是我的投影矩阵代码
//cout << eye_fov << ” ” << zNear << ” ” << zFar << endl;
// // // Students will implement this function
zNear = -zNear;
zFar = -zFar;
Eigen::Matrix4f projection = Eigen::Matrix4f::Identity();
Eigen::Matrix4f M_persp2ortho;
M_persp2ortho << zNear, 0, 0, 0,
0, zNear, 0, 0,
0, 0, zNear+zFar, -zNear*zFar,
0, 0, 1, 0;
eye_fov = eye_fov * M_PI / 180;
float t = tan(eye_fov/2.0) * abs(zNear), b = -t;
float r = aspect_ratio * t, l = -r;
Eigen::Matrix4f M_ortho1;
M_ortho1 << 2.0/(r-l), 0, 0, 0,
0, 2.0/(t-b), 0, 0,
0, 0, 2.0/(zNear-zFar), 0,
0, 0, 0, 1.0;
Eigen::Matrix4f M_ortho2;
M_ortho2 << 1.0, 0, 0, -(r+l)/2,
0, 1, 0, -(t+b)/2,
0, 0, 1, -(zNear+zFar)/2,
0, 0, 0, 1.0;
Eigen::Matrix4f M_ortho = M_ortho1 * M_ortho2;
projection = M_ortho * M_persp2ortho;
// TODO: Implement this function
// Create the projection matrix for the given parameters.
// Then return it.
return projection;

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[Andy]

这个取决于你怎么做z-buffer的判断。在rasterize_triangle 函数中。

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[輕山柒海]

这篇文章里有详细的讲解！！
《GAMES101》作业框架问题详解

[Author]

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