Addforce based on player direction

This is what i have currently:

Code (csharp):

1. #pragma strict
2.  
3. var fireball : Transform;
4. var mana : int = 10;
5. var moveRight : KeyCode; // Set in Inspector
6. var moveLeft : KeyCode;
7.  
8.  
9. function Start () {
10.  
11. }
12.  
13. function Update () {
14.  
15. if(Input.GetKeyDown("space")  (Input.GetKey("d"))){
16. Instantiate(fireball, transform.position, transform.rotation); // Create object at player's position (relative)
17. rigidbody2D.AddForce (Vector3.right * 8);
18. }
19.  
20. if(Input.GetKeyDown("space")  (Input.GetKey("a"))){
21. Instantiate(fireball, transform.position, transform.rotation); // Create object at player's position (relative)
22. rigidbody2D.AddForce (Vector3.left * 8);
23. }
24.  
25.  
26. }

But with this script, the fireballs then spawn and change direction if i change direction. Eg, if i shoot one to the right, it moves right, but if i then press a to move my player to the left, the same fireball changes direction and heads to the left.

How do i stop the fireball changing direction after it has picked which direction to head to?

 

You can try to use transform.right instead of Vector3.right:

Code (csharp):

1.  
2. rigidbody2D.AddForce (transform.right * 8)
3. ///instead of
4. rigidbody2D.AddForce (Vector3.right * 8);
5.  

 

Error: 'left' is not a member of 'UnityEngine.Transform'.

 

left is -right.

 

Code (csharp):

1. rigidbody2D.AddForce (transform.-right * 8);

This gives me: Expecting ), found "."

 

my bad, i was not clear enough...

Code (csharp):

1.  
2. rigidbody2D.AddForce (-transform.right * 8);
3. //or
4. //rigidbody2D.AddForce (transform.right * -8);
5.  

when I said that left is -right i was referring to Vector3, so transform.right = right and the opposite of that -transform.right is "transform's left".

 

Oh okay. It still does the same thing as my original post though. Literally nothing changed.

 

Every fireball you instantiate will change it's force every Update depending on your keypresses (and each one should also be spawning one new fireball).
You should have one instance where you check for keypresses and instantiate the fireballs (in player script or a new one maybe), then instantiate a new fireball and either use ConstantForce (https://docs.unity3d.com/Documentation/ScriptReference/ConstantForce.html) or have AddForce in fireball Update and have it move depending on the direction you assign it when you instantiate the fireball.