public void DragEnd()
{
dragEnd = Input.mousePosition;
endTime = Time.time;
float dragDuration = endTime - startTime;
float launchSpeed_x = (dragEnd.x - dragStart.x) / dragDuration;
float launchSpeed_z = (dragEnd.y - dragStart.y) / dragDuration;
launchSpeed_z *= -1;
Vector3 launchVelocity = new Vector3(launchSpeed_x, 0, launchSpeed_z);
ball.Launch(launchVelocity);
}
