面部方向矢量

本文介绍了面部方向矢量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

大家好！

我们正在构建一个面部跟踪应用程序，我们无法理解FaceAlignment.FaceOrientation向量中数字的确切含义。这个向量有4个值，x，y，z和w，我们认为前三个分别表示音高，yaw 和roll。但是，我们不确定"w"代表什么。

We are building an application for face tracking, and we have trouble understanding the exact meanings of the numbers in the FaceAlignment.FaceOrientation vector. This vector has 4 values, x, y, z and w, and we believe the first three represent pitch, yaw and roll respectively. However, we are unsure of what the 'w' represents.

（此向量也可能是四元数，其中音高将是atan2（2（xy + zw），1-2 （y2 + z2）），偏航和滚动会有类似的方程式。）

(This vector might also be a quaternion, where pitch would beatan2(2(xy + zw) , 1-2(y2 + z2)), and yaw and roll would have similar equations).

谢谢！

- Samuel Johnston和Rolando Coto

- Samuel Johnston and Rolando Coto

推荐答案

事实上，我有同样的问题。如果我想得到一个前脸，如何使用FaceOrientation的Vector4围绕这些协调器旋转。 Vector4的零点在哪里，我认为不是HeadPivotPoint。 In fact, I have the same question. If I want to get an frontial face, how to use that FaceOrientation's Vector4 to rotate around these coordinators. Where is the zero point of that Vector4, I think it's not that HeadPivotPoint.