How to smooth out movement in a 3D space?

Hello Unity Community!

I am currently working on a 3D space combat game (chicken invaders styled). I’ve been working on my ship controller, using code like transform.Translate(-Time.deltaTime*speed,0,0); to move my object.

However, it seemed very jerky, so I tried using Vector3.SmoothDamp() instead. Here’s how the code looks

using UnityEngine;
using System.Collections;
using System;
using System.Collections.Generic;

public class ShipController : MonoBehaviour {
	public int speed = 20;
	public float smoothTime ;
	private Vector3 velocity =;
	Vector3 targetPosition;
	private void Start()
		smoothTime = (100/speed);
		targetPosition = new Vector3(-1000,0,0);
	void Update() {

		Vector3 pos = Camera.main.WorldToViewportPoint (transform.position);
		pos.x = Mathf.Clamp(pos.x, 0.09f, 0.91f);
		pos.y = Mathf.Clamp(pos.y, 0.15f, 0.9f);
		transform.position = Camera.main.ViewportToWorldPoint(pos);

			transform.position = Vector3.SmoothDamp(this.transform.position, targetPosition, ref velocity, smoothTime);

It works well, smooth, responsive and flexible. It has only one problem: since I’m using targetPosition = new Vector3(-1000,0,0); , my object translates to the left, but also towards the center. I want my object to move only to the left, and not hover towards the center, regardless of its current position.

Or, if someone could suggest and exemplify a different method of implementing this movement, it would be most welcomed.

Thank you for your time!

Your targetPosition has a y-coordinate of 0. I assume that (0,0,0) is in the center of the screen.

Try something like this.

 private void Start()
        smoothTime = (100/speed);
        targetPosition = this.transform.position;
        targetPosition.x = -1000;

This way you set the y and z coordinates to their old values and only change the x.