Load an arbitrary matrix to the current projection matrix.
加载一个任意的矩阵到当前的投影矩阵。
How to get camera transform matrix from camera projection matrix?
如何让相机变换矩阵从摄像机投影矩阵？
According to the influence of degenerate point configurations of projection matrix, the number of calibration correspondences and the track of users head are improved.
根据对投影矩阵的退化点结构的影响，改进了选取标定的对应点个数和用户头部的运动轨迹。
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