Trying to move an instantiated object with a Rigidbody2D and AddForce

Question

I am setting up a gameobject that uses a coroutine to endlessly spawn bullets, and I want to make it so that when I rotate the gameobject it also changes the direction the bullets are spawning and moving at. Currently, the projectiles do not move at all.

The first if statement is determined by a public bool laser, which I have toggled in the editor for specific prefabs. I have declared _bullet and _laser as GameObjects and serialized them so I can plug them in the editor. I have also declared a public RigidBody rb but haven't assigned anything to it in the editor. The Rigidbodies are kinematic.

 IEnumerator Shoot()
 {
     while (true)
     {
         yield return new WaitForSeconds(1);
         if (laser == false)
         {
             Instantiate(_bullet, transform.position + new Vector3(0, 0, 0), Quaternion.identity);
             rb = _bullet.GetComponent<Rigidbody2D>();
             rb.AddForce(new Vector2(10, 0));
         }
         else if (laser == true)
         {
             Instantiate(_laser, transform.position + new Vector3(0, 0, 0), Quaternion.identity);
             rb = _laser.GetComponent<Rigidbody2D>();
             rb.AddForce(new Vector2(10, 0));
         }
     }
 }

Answer 1

Best Answer

Answer by pako · Dec 15, 2017 at 07:37 PM

 Rigidbody rb;
 GameObject go;
 
  IEnumerator Shoot()
  {
      while (true)
      {
          yield return new WaitForSeconds(1);
          if (laser == false)
          {
              go = Instantiate(_bullet, transform.position + new Vector3(0, 0, 0), Quaternion.identity) as GameObject; //you must get a reference to the newly instantiated GameObject
              rb = go.GetComponent<Rigidbody2D>(); //then, get a reference to the Rigidbody of the newly instantiated GameObject (not the one on the prefab)
              rb.AddForce(new Vector2(10, 0));
          }
          else if (laser == true)
          {
              go = Instantiate(_laser, transform.position + new Vector3(0, 0, 0), Quaternion.identity) as GameObject;
              rb = go.GetComponent<Rigidbody2D>();
              rb.AddForce(new Vector2(10, 0));
          }
      }
  }

EDIT: Your Rigidbodies must not be kinematic if you want to move them using the Physics Engine, e.g. with AddForce().

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shamblinwithshotguns · Dec 17, 2017 at 03:03 AM 0

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Thank you very much for clearing that up! I also had to change Quaternion.identity to transform.rotation. The turrets work as intended!

pako shamblinwithshotguns · Dec 17, 2017 at 10:10 AM 0

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I'm glad it now works for you. Could you please mark my answer as "accepted"? (Click on the green "check mark" ).

Trying to move an instantiated object with a Rigidbody2D and AddForce

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