# Character Movement ## Head movement Since the actual human neck and head are rotational joints that move in **3D space**, motion data values are calculated in **three major axes**. At this time, the names of the three axes will change depending on which axis you look at as a reference, and the movements based on each axis will appear differently. First, the **Up vector** and the **LookAt vector** are defined, and then the direction of movement will be determined based on each vector.

### From Up Vector * If the Up vector is the standard, the x-axis movement becomes Roll, the y-axis movement becomes pitch, and the z-axis movement becomes yaw.

### From LookAt Vector * If the LookAt vector is the standard, the x-axis movement becomes pitch, the y-axis movement becomes yaw, and the z-axis movement becomes roll.