AddForce Impulse not moving the object

Question

Hi, I have a prefab object called "Meteor", which is instantiated randomly at the right edge of the screen using a coroutine. The meteor is instantiated through another script, named "meteorController", to prevent clones from instantiating themselves. The script is attached to a gameobject with the same name. After MeteorPrefab is instantiated, I want to give it force towards another object, called "Spaceship". I've tried doing it using AddForce with Impulse as the force mode, but it's not working: the meteors are instantiated properly but they aren't moving at all, although no error messages are displayed. The MeteorPrefab's rigidbody is set to "dynamic" and it has a mass value of 1. I'm new to #c. maybe something is wrong with my code? Help would be appreciated. Thanks

The meteorController script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class meteorController : MonoBehaviour
 {
     public GameObject MeteorPrefab;
     public float timer = 5.0f;
     private Vector2 screenBounds;
     public Transform spaceship;
     public Rigidbody2D rb;
     public float force = 100.0f;
 
     void Start()
     {
         screenBounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
         StartCoroutine(Meteor());
         Debug.Log(screenBounds);
     }
 
 
 
     private void SpawnMeteor()
     {
         GameObject spawn = Instantiate(MeteorPrefab) as GameObject;
         spawn.transform.position = new Vector2(screenBounds.x, Random.Range(-screenBounds.y, screenBounds.y));
         rb = spawn.GetComponent<Rigidbody2D>();
         Vector3 direction = spaceship.position - transform.position;
         float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
         rb.rotation = angle;
         rb.AddForce(spawn.transform.forward * force, ForceMode2D.Impulse);
     }
 
     IEnumerator Meteor()
     {
         while (true)
         {
             yield return new WaitForSeconds(timer);
             SpawnMeteor();
         }
     }
 
 
 }

Here's a screenshot of the MeteorPrefab's Rigidbody2D component:

alt text

Answer 1

Best Answer

Answer by Eno-Khaon · Feb 11 at 11:05 AM

Since your game's in 2D, using a 3D, z-axis vector for movement shouldn't be able to cause visible movement.

 rb.AddForce(spawn.transform.forward * force, ForceMode2D.Impulse);

I wouldn't know your intended orientation off hand, but using something like Transform.right or .up should be all that's necessary to apply force in a usable direction:

 // For reference, a variation that ignores mass, in case
 // you change that value eventually
 rb.AddForce(rb.mass * spawn.transform.right * force, ForceMode2D.Impulse);

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Flumph1 · Feb 11 at 12:27 PM 0

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It works now, thank you!

AddForce Impulse not moving the object

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