void InstantiatePeriodically()
{
Vector2 rand = Random.insideUnitCircle * 6;
Vector3 spawnPoint = spawnCenter + new Vector3(rand.x, 0, rand.y);
GameObject ball = Instantiate(prefab, spawnPoint, Quaternion.identity);
Rigidbody rb = ball.GetComponent <Rigidbody>();
Transform tra = ball.GetComponent <Transform>();
MoveToPoint mtp = ball.GetComponent <MoveToPoint>();
tra.localScale *= Random.Range(0.5f, 2.0f);
rb.mass *= Random.Range(0.5f, 2.0f);
mtp.ScaleMovePower(Random.Range(0.5f, 2.0f));
mtp.ScaleMaxAngularVelocity(Random.Range(0.5f, 2.0f));
Invoke("InstantiatePeriodically", period);
}
