Kinect for Windows 1.5, 1.6, 1.7, 1.8Gets a four-component vector that points in the direction of gravity.
The accelerometer reading is returned as a 3d vector pointing in the direction of gravity (the floor on a non-accelerating sensor). The vector is in gravity units (g), or 9.81m/s^2. The right-handed coordinate system is centered on the sensor with positive z in the direction the sensor is pointing. In the default sensor rotation (horizontal, level placement), this will return the vector (0, -1.0, 0, 0). The w value of the Vector4 is always set to 0.0.