好吧，我正在使用python从kinect v2获取视频，pylibfreenect2支持获取3D坐标，即getPointXYZRGB。
我可以获取3D坐标，但是我不知道为什么y有时会是负值。
(0.24363504350185394, -0.12693335115909576, 0.5583441853523254, 0, 0, 0)
(0.24363504350185394, -0.12693335115909576, 0.5583441853523254, 0, 0, 0)
(0.18147888779640198, -0.12480200827121735, 0.5007268786430359, 147, 161, 190)
(0.18147888779640198, -0.12480200827121735, 0.5007268786430359, 147, 161, 190)
(0.24363504350185394, -0.12693335115909576, 0.5583441853523254, 0, 0, 0)
(nan, nan, nan, 0, 0, 0)
(nan, nan, nan, 0, 0, 0)
(0.20137207210063934, 0.040071550756692886, 0.6663575768470764, 50, 61, 75)
(0.20015870034694672, 0.23069657385349274, 0.5694747567176819, 4, 10, 9)