Trying to make an object bounce off a wall

Hi new programmer here, made a script attached to a sphere that should make it bounce back upon colliding with a certain tag.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PushBack : MonoBehaviour {
5.  
6.     public float speed = 10;
7.     public Rigidbody2D rb;
8.     Vector3 pushRight;
9.     Vector3 pushLeft;
10.  
11.     // Use this for initialization
12.     void Start () {
13.         rb = GetComponent<Rigidbody2D>();
14.         pushRight = new Vector3 (5f, 0f, 0f);
15.         pushLeft = new Vector3 (-5f, 0f, 0f);
16.     }
17.    
18.     // Update is called once per frame
19.     void Update () {
20.        
21.     }
22.        
23.         void OnCollisionEnter2D(Collision2D other) {
24.         if (other.gameObject.tag == "Right Wall") {
25.             Debug.Log ("pushRight");
26.             rb.AddForce (pushRight * speed);
27.             }
28.         if (other.gameObject.tag == "Left Wall") {
29.             Debug.Log ("pushLeft");
30.             rb.AddForce (pushLeft * speed);
31.         }
32.     }
33. }
34.  

Not sure why but even though it shows as called in the console the ball doesn't bounce back.
Any input would be appreciated.

 

Use ForceMode2D.Impulse when applying an instantaneous force:

rb.AddForce(pushRight * speed, ForceMode.Impulse);

Rigidbody2D.AddForce() uses a Vector2 for its force value. Vector3's are implicitly converted to Vector2's by dropping the z-value, but in the future you may be able to save some typing when making new force vectors in-script.

 

Shouldn't bouncing off the right wall be pushing left and vice versa?

Here's another way to organize that logic:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PushBack : MonoBehaviour {
5.  
6.     public float pushForce = 10;
7.     public Rigidbody2D rb;
8.  
9.     // Use this for initialization
10.     void Start() {
11.         rb = GetComponent<Rigidbody2D>();
12.     }
13.  
14.     // Update is called once per frame
15.     void Update() {
16.  
17.     }
18.  
19.     void OnCollisionEnter2D(Collision2D other) {
20.         if(other.gameObject.tag == "Right Wall") {
21.             Debug.Log("pushLeft");
22.             rb.AddForce(Vector2.left * pushForce, ForceMode2D.Impulse);
23.         }
24.         else if(other.gameObject.tag == "Left Wall") {
25.             Debug.Log("pushRight");
26.             rb.AddForce(Vector2.right * pushForce, ForceMode2D.Impulse);
27.         }
28.     }
29. }

 

Thanks for the help that fixed my problem! ^^

 

i found the solution in this video:

 

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