Bounce when hitting wall

Question

Hey everyone I'm working on a simple 2d game, but I've run into a problem. Right now if you shoot a projectile and it hits the wall it will bounce perfectly. But if it hits another wall it screws up, which is perfectly makes sense. Why? Because that's how I coded it. Here is a example picture of the problem:

alt text

I need help to reformulate the code, and here it is:

 public class bullet : MonoBehaviour {
     
     public Vector3 velocity;
     public float speed;
     
 
     void Start () {
         velocity = transform.up;
         speed = 250;
         
         StartCoroutine (Wait (5));
     }
     
     void Update () {
         transform.position += velocity * Time.deltaTime * speed;
     }
     
     IEnumerator Wait(float seconds) {
         yield return new WaitForSeconds(seconds);    
         Destroy(transform.gameObject);
     }
     
     public void OnCollisionEnter(Collision owner) {
         if(owner.gameObject.tag == "wall") {
             
             foreach( ContactPoint contact in owner.contacts ) {
                 velocity = Quaternion.AngleAxis(180, contact.normal) * transform.up * -1;    
             }
         }
     }
 }

Answer 1

Answer by IgorAherne · Aug 13, 2013 at 05:45 PM

using UnityEngine; using System.Collections;

public class move: MonoBehaviour {

 public Vector3 velocity;
 public float speed;
  bool flipped = false;
 
 void Start () {
    velocity = transform.up;
    speed = 3;
 
    StartCoroutine (Wait (5));
 }
 
 void Update () {
    transform.position += velocity * Time.deltaTime * speed;
     Debug.DrawRay(transform.position, velocity*10);
 }
 
 IEnumerator Wait(float seconds) {
    yield return new WaitForSeconds(seconds); 
    Destroy(transform.gameObject);
 }
 
 public void OnCollisionEnter(Collision owner) {
     Debug.Log ("Collision");
    if(owner.gameObject.tag == "wall") {
 
      foreach( ContactPoint contact in owner.contacts ) {
             Debug.Log ("going");
         if(!flipped){
       velocity = Quaternion.AngleAxis(180, contact.normal) * transform.up*-1;  
         flipped = true;
             }
         else{
          velocity = Quaternion.AngleAxis(0, contact.normal) * transform.up;
             flipped = false;
             }
      }
    }
 }

}

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Pulsar-Regions · Aug 13, 2013 at 06:18 PM 0

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I made it kinda work by adding 'return' on both sides so it doesn't execute both. Anyways, sometimes it screws up the direction it's going, but it's atleast a step closer.

edit: added: rigidbody.freezeRotation = true; in start function and it's now working correctly thank you.

edit: well I noticed when it's colliding with a vertical wall and then a horizontal wall (and conversely) it does not bounce correctly. Anybody knows how to fix this?

Answer 2

Answer by kirbygc00 · Jun 05, 2021 at 05:06 PM

https://docs.unity3d.com/ScriptReference/Vector3.Reflect.html Seems relevant

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Bounce when hitting wall

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