Simple script problem.

I'm currently working on a rock that moves in a random direction but I can't make it work.

Here's the script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class RockController : MonoBehaviour {
5.  
6.     private Rigidbody myRigidbody;
7.     public int speed;
8.  
9.     // Use this for initialization
10.     void Start () {
11.         myRigidbody = GetComponent<Rigidbody>();
12.     }
13.    
14.     // Update is called once per frame
15.     void Awake () {
16.         int x = Random.Range (-1, 1);
17.         int z = Random.Range (-1, 1);
18.         Vector3 direc = new Vector3 (x, 0f, z);
19.         myRigidbody.AddForce (direc * speed);
20.     }
21. }
22.  

And the error message:

 

Awake is only called once. https://docs.unity3d.com/ScriptReference/MonoBehaviour.Awake.html

 

The actual problem is that Awake is always called before Start. So you've got a slightly wrong order there.

 

So if I want to apply that force just once at the very start of the game, what should I use instead of Awake?

 

You have to switch the methods around. Turn your start in Awake () and your awake into Start()

 

Code (CSharp):

1.  
2. public class RockController : MonoBehaviour {
3.     private Rigidbody myRigidbody;
4.     public int speed;
5.     Vector3 direc;
6.  
7.     // Use this for initialization
8.     void Start () {
9.         myRigidbody = GetComponent<Rigidbody>();
10.         int x = Random.Range (-1, 1);
11.         int z = Random.Range (-1, 1);
12.         direc = new Vector3 (x, 0f, z);
13.     }
14.  
15.     // FixedUpdate is called once per physics frame
16.     void FixedUpdate() {//ADD SPEED EVERY PHYSICS FRAME
17.    
18.         myRigidbody.AddForce (direc * speed);
19.     }
20. }

Look up the ForceMode variable for the AddForce method.
also, if your drag is zero and you keep speeding it up, you're gonna have a bad day.

 

Turn Update into FixedUpdate

 

Whoops, sorry, haha.