Cam
Cam rotate by is used to make the camera look towards an angle relative to the current camera angle. One way to think of this packet is that it adds values to the x and y angles of the camera.
Properties
the camera easing function, allowing for finer control over the way it moves from the start coordinate to the end.
the additional angle to add to the x-axis of the camera. It's worth noting that the x angle of the camera ranges between 128 and 383 (inclusive), and the resulting value is coerced in that range. Negative values are also accepted. Additionally, there is currently a bug in the client that causes the third and the fifth least significant bits of the resulting angle to be discarded due to the code doing (cameraXAngle + pitch& 2027), which is further coerced into the 128-383 range.