Explaining A Mouse Look Script

Questions & Answers
1

I recently found a Mouse Look Script online that works perfectly fine. However, rather than just copying and pasting, then dragging and dropping, I was wondering if there was anyone who could explain this script line for line. Much thanks in advance!

Here’s the script:
@script AddComponentMenu (“Camera-Control/Mouse Look”)
enum RotationAxes { MouseXAndY = 0, MouseX = 1, MouseY = 2 }
var axes = RotationAxes.MouseXAndY;
var sensitivityX : float = 15;
var sensitivityY : float = 15;

var minimumX : float = -360;
var maximumX : float = 360;

var minimumY : float = -60;
var maximumY : float = 60;

var rotationX : float = 0;
var rotationY : float = 0;

private var originalRotation : Quaternion;

function Update () {
if (axes == RotationAxes.MouseXAndY) {
rotationX += Input.GetAxis(“Mouse X”) * sensitivityX;
rotationY += Input.GetAxis(“Mouse Y”) * sensitivityY;

	rotationX = ClampAngle (rotationX, minimumX, maximumX);
	rotationY = ClampAngle (rotationY, minimumY, maximumY);
	
	var xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
	var yQuaternion = Quaternion.AngleAxis (rotationY, Vector3.left);
	
	transform.localRotation = originalRotation * xQuaternion * yQuaternion;
}
else if (axes == RotationAxes.MouseX) {
	rotationX += Input.GetAxis("Mouse X") * sensitivityX;
	rotationX = ClampAngle (rotationX, minimumX, maximumX);

	xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
	transform.localRotation = originalRotation * xQuaternion;
}
else {
	rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
	rotationY = ClampAngle (rotationY, minimumY, maximumY);

	yQuaternion = Quaternion.AngleAxis (rotationY, Vector3.left);
	transform.localRotation = originalRotation * yQuaternion;
}

}

function Start () {
if (rigidbody)
rigidbody.freezeRotation = true;
originalRotation = transform.localRotation;
}

static function ClampAngle (angle : float, min : float, max : float) : float {
if (angle < -360.0)
angle += 360.0;
if (angle > 360.0)
angle -= 360.0;
return Mathf.Clamp (angle, min, max);

}

2

I don’t know about line by line, but here is the idea :

  • Get the mouse input.
  • Clamp the angle between a min and a max. ( Basically, when you look up, it blocks from going upside down )
  • Creating the rotation made by that input.
  • Affecting the rotation the object.