4 blocks destroyed - gravity true

I’m shooting projectiles at a tower of blocks. When a block is struck it is destroyed. Once 4 blocks are destroyed I’d like to turn on gravity for ALL the blocks so the tower will crumble.

Any ideas on how to script something like this?



Assuming you have a Rigidbody attached to each block, you could set their useGravity flags to true, once the tower should collapse.

Thanks for the feedback. I’m trying this but not having much success:
var smokePrefab: Transform;
var int objectDestroyed = 0;

//Invoke("OnCollisionEnter", 2);
function OnCollisionEnter(collision : Collision) 
if (collision.gameObject.tag == "missile_1")
Destroy (gameObject);
Instantiate (smokePrefab, transform.position, transform.rotation);

 if objectDestroyed == 4;
 gameObject.rigidbody.useGravity = true;

Any suggestions?..