Why is this script making the GameObject shake?

I have a script that works as a crouching script. Here's the code...

Code (JavaScript):

1. var LeftTexture :GameObject;
2. var RightTexture :GameObject;
3. var player : CharacterController;
4. var standHeight : float = 2.5;
5. var crouchHeight : float = 1.5;
6. var smooth : float = 0;
7. var cam : GameObject;
8. var standCamera : float = 0;
9. var crouchCamera : float = -1.5;
10. var footsteps : AudioSource;
11.  
12. function Update () {
13.     if (Input.GetButtonDown ("Crouch"))
14.         if( LeftTexture.activeSelf){
15.             RightTexture.SetActive (true);
16.             LeftTexture.SetActive (false);
17.         }
18.         else if (RightTexture.activeSelf){
19.             LeftTexture.SetActive (true);
20.             RightTexture.SetActive (false);
21.         }
22.  
23.     if (LeftTexture.activeSelf)
24.     {
25.         player.height = player.height = Mathf.Lerp(player.height,crouchHeight,Time.deltaTime*smooth);
26.     }
27.  
28.     if (RightTexture.activeSelf)
29.     {
30.         player.height = player.height = Mathf.Lerp(player.height,standHeight,Time.deltaTime*smooth);
31.     }
32.  
33.     if(player.height < 1.3 || player.height > 1.3 && player.height < 2.5)
34.     {
35.         footsteps.enabled = false;
36.     }
37.  
38.     if(player.height == 1.3 || player.height == 2.5)
39.     {
40.         footsteps.enabled = true;
41.     }
42.  
43.     if (LeftTexture.activeSelf)
44.     {
45.         cam.transform.position.y = cam.transform.position.y = Mathf.Lerp(cam.transform.position.y,crouchCamera,Time.deltaTime*smooth);
46.     }
47.  
48.     if (RightTexture.activeSelf)
49.     {
50.         cam.transform.position.y = cam.transform.position.y = Mathf.Lerp(cam.transform.position.y,standCamera,Time.deltaTime*smooth);
51.     }
52. }
53.  
54.    

But the part where I make the variable cam lerp y positions, it only makes the GameObject shake up and down. How do I fix this?

 

You're not using linear interpolation correctly - a very common beginner's trap, mostly caused by the official documentation being wrong. Here is a very nice explanation on how you should use it.

 

Your lerp speed is always 0, so I don't know how the camera could even move. Or is it being set somewhere else in the code?
Set the lerp speed to 2 for example.

It looks like you're are trying to set it up to use SmoothDamp:
http://docs.unity3d.com/ScriptReference/Mathf.SmoothDamp.html