void CreateCloud() //generates clouds offscreen.
{
float startX = 25, startY = Random.Range(0, 20);
float xVelocity = Random.Range(.1f, .3f);
startX = -12 + Random.Range(4, 16);
GameObject cloud = Instantiate(clouds[0]);
CloudData data = cloud.GetComponent <CloudData>();
data.SetPos(new Vector2(startX, startY));
data.SetVelocity(new Vector2(xVelocity, .001f));
activeClouds.Add(data);
}