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Question by termsofuse_bob · Sep 02, 2015 at 09:35 AM · c#2d-platformer2d-physics

[2D] Add force to all colliders within a certain radius

Hello! I am making a 2D game and after a few days of testing, I am unsure how to add force to all colliders within a certain radius. As seen as this is a 2D game, AddExplosionForce cannot be used (maybe it can and I am just missing something).

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Answer by Ermiq · Aug 16, 2018 at 12:04 AM

Maybe use Physics2D.CircleCast or Physics2D.OverlapCircleto get array of colliders:

 Vector2 originOfExplode;
 float radius;
 float forceMultiplier; // force of the explosion
     
 public void Explosion ()
 {
     
     Collider2D[] colliders = Physics.OverlapCircleAll (originOfExplode, radius);
     
     foreach (Collider2D col in colliders)
     {
         // the force will be a vector with a direction from origin to collider's position and with a length of 'forceMultiplier'
         Vector2 force = (col.transform.position - originOfExplode) * forceMultiplier;
         Rigidbody rb = col.transform.GetComponent<Rigidbody> ();
         rb.AddForce (force);
     }
 }
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