Smooth Mouse Look

using UnityEngine;
using System.Collections;

/// <summary>
/// One instance will turn the whole player body and one - only camera
/// </summary>
public enum RotationAxes { X, Y, Both };

/// <summary>
/// FPS mouse look.
/// </summary>
[AddComponentMenu("FPS Stuff/Smooth Mouse Look")]
public class MouseLook : MonoBehaviour
{
    public RotationAxes rotationAxes;
    public Vector2 mouseSensitivity;
    public Vector2 mouseSmoothness;
    public Vector2 verticalRestriction;

    private Vector2 lookDelta = Vector2.zero;
    private Vector2 smooth = Vector2.zero;
    private Vector2 smoothVelocity = Vector2.zero;

    void Update()
    {
        Vector2 mouseDelta = new Vector2(Input.GetAxisRaw("Mouse X") * mouseSensitivity.x,
                                         -Input.GetAxisRaw("Mouse Y") * mouseSensitivity.y);
        lookDelta += mouseDelta;

        // turn player on Y axis
        if (rotationAxes == RotationAxes.X)
        {
            smooth.x = Mathf.SmoothDamp(smooth.x, lookDelta.x, ref smoothVelocity.x, mouseSmoothness.x);

            Quaternion rotation = Quaternion.Euler(transform.rotation.eulerAngles.x, smooth.x, transform.rotation.eulerAngles.z);
            rigidbody.MoveRotation(rotation);
        }
        else if (rotationAxes == RotationAxes.Y)
        {
            smooth.y = Mathf.SmoothDamp(smooth.y, lookDelta.y, ref smoothVelocity.y, mouseSmoothness.y);
            smooth.y = ClampAngle(smooth.y, verticalRestriction.x, verticalRestriction.y);

            Quaternion rotation = Quaternion.Euler(smooth.y, transform.rotation.eulerAngles.y, transform.rotation.eulerAngles.z);
            transform.rotation = rotation; // camera has no rigidbody so use transform
        }
    }

    static float ClampAngle(float angle, float min, float max)
    {
        if (angle < -360)
            angle += 360;
        if (angle > 360)
            angle -= 360;
        return Mathf.Clamp(angle, min, max);
    }
}