Jittery motion when interpolating movement in unity3d - unity3d

Question

Basically, I have two gun objects on my fps player. The real gun and the gun that the player sees. I have a script on the gun that the player sees to follow the position and rotation of the real gun which is a child of the camera via interpolation.
Rotation is fine, but I get jittery movement with the position of the gun. Here is my smooth move script on the gun that the player sees:
public Transform target; //The gun that the player doesn't see
public float moveSpeed = 0.125f;
public float rotateSpeed = 0.125f;
void LateUpdate()
{
//this is causing the jittery motion
transform.position = Vector3.Lerp(transform.position, target.position, moveSpeed);
//this is very smooth
transform.rotation = Quaternion.Lerp(transform.rotation, target.rotation, rotateSpeed);
}
Does anybody know why?

Answer 1

Edit:
Otherwise, I would go with a more sensible Unit for your moveSpeed, something that makes sense in your world e.g. 1 meter, then I would use Time.deltaTime to smooth the movement. If it's too slow or too fast you can tweak the speed unit.
[SerializeField] private float moveSpeed = 1f;
void LateUpdate()
{
var t = moveSpeed * Time.deltaTime; //< just to highlight
transform.position = Vector3.Lerp(transform.position, target.position, t);
}
The practical reason for using Time.deltaTime is to help smooth depending on your frame rate, if you get a lower frame the Lerp will then adjust. This common method is also explained in this answer by Eric5h5 from Unity forum.
Hmm, I wonder if you really need a Lerp to update the Gun position, if you want to sync both I would just update your transform.position = target.position since it's done every frame, they would be in sync.
Adding a lerp would just delay that sync.
The fact that you see a difference between the Quaternion and the Lerp is just that you cannot compare those two speed, I believe the speed you set on a rotation is much faster than the one for the lerp.