Free Head Sway Script

Hello everyone,
Yesterday I was looking for a simple and realistic look sway script, but didn't find anything I thought was adequate. Now I've written one, and I thought I'd share it! Feel free to edit it, use it in your game, etc.

Code (CSharp):

1. using UnityEngine;
2.  
3. // Attach to object which parents the camera and does not have other scripts affecting the transform
4. public class LookSway : MonoBehaviour
5. {
6.     public const string VerticalAxisKey = "Vertical";
7.  
8.     public float HorizontalAmplitude = 0.05f;
9.     public float VerticalAmplitude = 0.12f;
10.  
11.     public float WalkSpeed = 6f;
12.     public float WalkSpeedMagnitudeMultiplier = 0.025f;
13.  
14.     public float BaseSpeed = 1.25f;
15.  
16.     private Vector3 movement;
17.     private float progress;
18.  
19.     private void Start()
20.     {
21.         movement = Vector3.zero;
22.     }
23.  
24.     private void Update()
25.     {
26.         progress = (progress + (Time.deltaTime * BaseSpeed + NormalizedSpeed * WalkSpeed * Time.deltaTime) * (Random.Range(0f, 2f))) % (2 * Mathf.PI);
27.         movement.x = ((NormalizedSpeed * WalkSpeedMagnitudeMultiplier) + VerticalAmplitude) * Mathf.Cos(progress + Mathf.PI / 2);
28.         movement.z = ((NormalizedSpeed * WalkSpeedMagnitudeMultiplier) + HorizontalAmplitude) * Mathf.Sin(Mathf.PI / 2 - 2 * progress);
29.  
30.         transform.localEulerAngles = movement * 10;
31.     }
32.  
33.     public float NormalizedSpeed
34.     {
35.         get
36.         {
37.             return Input.GetAxis(VerticalAxisKey);
38.         }
39.     }
40. }
41.  

Alternitavely, if you have a Rigidbody attached to your walking script, you could edit the property NormalizedSpeed to be dependent on the Rigidbody's speed rather than the user's input, resulting to something along the lines of

Code (CSharp):

1. public float NormalizedSpeed
2. {
3.     get
4.     {
5.           return _rigidbody.velocity.magnitude / maxWalkSpeed;
6.     }
7. }
8.  
9.  

Hope this helps!