How to make objects collide just once?

Question

I have objects that look like square.(have collider and rigidbody)

I want those squares to make a sound when I hit these squares with an object. But just once(once for scene). If I hit one of the squares again, ıt shouldn't make sound. How could I do this ?

Thanks in advance !

Answer 1

When the OnCollisionEnter() method is called you can check if a bool variable was set to true.

hasCollided = false;

void OnCollisionEnter(Collision collision){
    if (!hasCollided){
        // Play sound
        hasCollided = true;
    }        
}