Stopping z axis rotation, while allowing diagonal rotation.

Unity Engine
1

Hi, I’ve just started Unity and have a question about the z axis rotation. In my 3D game, the player/camera is grounded and can only rotate on the x and y axis 360 degrees. If the player presses both up and right arrows though, I found the z axis was activated, so I coded a conditional statement to stop this. I realised that this stopped a diagonal movement occurring. So, I was wondering what would be a good way to allow the player to move in a diagonal motion while keeping the x axis perspective horizontal (instead of looking tilted)?

Thanks.

#pragma strict

// Camera Control 

// Momement of the camera (first person)...
var xCameraRotationSpeed : float = 100;
var yCameraRotationSpeed : float = 75;

function Update () {

	var h : float = Input.GetAxis("Horizontal") * Time.deltaTime * xCameraRotationSpeed;
	var v : float = Input.GetAxis("Vertical") * Time.deltaTime * yCameraRotationSpeed;

	if(h){
		// If h is true, don't call y axis rotation. 
		// Stops z axis rotation as a result of x and y axis pressed simutanisouly.
		transform.Rotate(0, h , 0);
	} 
	else if(v) {
		// Only called if h is false
		transform.Rotate(v, 0 , 0);
	}

}
2 
var xCameraRotationSpeed : float = 100;
var yCameraRotationSpeed : float = 75;

function Update () {

    var h : float = Input.GetAxis("Horizontal") * Time.deltaTime * xCameraRotationSpeed;

    var v : float = Input.GetAxis("Vertical") * Time.deltaTime * yCameraRotationSpeed;

 	transform.eulerAngles.z = 0;
        transform.Rotate(0, h , 0);
	transform.eulerAngles.z = 0;
        transform.Rotate(v, 0 , 0);

    }
}

Good enough for now.