How to fix minor jitter/stutter when moving a 2D character using physics in FixedUpdate()

Hey there, please help me out I’m searching the web for over a week to find a solution about why is my movement “jitterish” on a random intervals from 3-7 seconds I get 1 minor jitter.

PROBLEM: Receiving jitter on random times, 1 minor stutter/jitter per 3-5 seconds. Some say its not visible but it sure is, because I’m making an android game where your prediction of how much distance is to the next obstacle is really important. I’m amazed of how are other one tap/jump games made with 0 jitter.

I am receiving jitter in Editor and on standalone android apk.

I’m handling inputs in Update and moving in FixedUpdate. Camera follows in the LateUpdate.

What I have allready tried:

Update and LateUpdate methods:

  • transform.translate + Time.deltaTime (bad idea, i know)
  • rigidbody2d.velocity + Time.deltaTime (still bad idea)

FixedUpdate method (Timestep: 0.01333 / 75 fps):

  • rigidbody2D.AddForce
  • rigidbody2D.velocity + Interpolation/Extrapolation (my current one)

Nonetheless which option I choose it still jitters.

Working example in Unity WebPlayer

Here is the code:

In the first class I have my camera follow the player. And in the second one there is player movement and other controlls.

Camera script:

using UnityEngine;
using System.Collections;

public class CameraScript : MonoBehaviour {

	public Transform player;
	public Vector3 offset;

	private Vector3 targetPos;
	void LateUpdate () 
		// Smooth follow of the camera
		targetPos = new Vector3(player.position.x + offset.x, transform.position.y, transform.position.z);
		transform.position = Vector3.Lerp(transform.position, targetPos, 6.0f * Time.deltaTime);

Movement script:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PlayerController : MonoBehaviour {
	public float moveSpeed = 0;
	public float jumpHeight = 0;
	public Rigidbody2D playerRigidbody;
	public Transform playerTransform;

	public Animator anim;
	private bool grounded = false;
	private bool jump = false;
	private Transform groundCheck;

	private Vector3 start;
	void Awake () 
		// Find the groundCheck child transform
		groundCheck = transform.Find ("groundCheck");

	void FixedUpdate()
		// Move the player using physics
		playerRigidbody.velocity = new Vector2(moveSpeed, playerRigidbody.velocity.y);
		if (jump) {
			playerRigidbody.velocity = new Vector2(playerRigidbody.velocity.x, jumpHeight);
			jump = false;

	void Update ()
		// Cast a line to the ground so we cant jump while in mid-air
		grounded = Physics2D.Linecast(transform.position, groundCheck.position, 1 << LayerMask.NameToLayer("Ground"));

			if(Input.GetKeyDown(KeyCode.UpArrow) && grounded) {
				jump = true;
			if(Input.touchCount > 0){
				Touch[] myTouches = Input.touches;
				// Handling multi-touch input
				for(int i = 0; i < Input.touchCount; i++){
					Touch myTouch = Input.GetTouch(i);
					if(grounded && myTouch.phase == TouchPhase.Began) {
						jump = true;

have you tried having your camera script also in a FixedUpdate function? why does it need to be in LateUpdate?

Solved my problem on switching from FixedUpdate to LateUpdate. I’m using ProCamera2D and Jelly Sprite third part assets.