detect gameobject at position

Unity Engine
1

before instantiating a prefab at a position i want to find out if there is already one in that area. i am using this method, but it doesnt work. The prefab that is instatiated has a 2d box collider and it has “is trigger”.

float xpos = Random.Range(5, -5);
float ypos = Random.Range(5, -5);

Collider[ ] hitColliders = Physics.OverlapSphere(new Vector2(xpos, ypos), 5);
if (hitColliders.Length == 1)
{
Debug.Log(“found something at that position”);
}
else
{
Instantiate(powerup1, new Vector2(xpos, ypos), transform.rotation);
}

2 
if (hitColliders.Length > 0)

Without a mask, the OverlapSphere will return any colliders so you probably want to use a LayerMask and the other override method for OverlapSphere.

3

Is this a 2D game with 2D colliders? If so, you need to use Physics2D.OverlapCircle, to receive a Collider2D array.

4

Works great jeffreyschoch! i totaly forgot about the Pysics2D. Thank you so much. Here is what i got now:

float xpos = Random.Range(15, -15);
float ypos = Random.Range(15, -15);

if (Physics2D.OverlapCircle(new Vector2(xpos,ypos), 1))
{
Debug.Log(“found something at that position”);
}

else
{
Instantiate(powerup1, new Vector2(xpos, ypos), transform.rotation);
}