void Spawn()
{
Vector3 pos = transform.position;
GameObject randomObject = obj[Random.Range(0, obj.GetLength(0))];
if(randomObject == null){
Invoke("Spawn", Random.Range (spawnMin, spawnMax));
return;
}
if(randomObject.tag == "Hill"){
pos.y = hillyStart;
}
GameObject newobj = (GameObject) Instantiate(randomObject, pos, Quaternion.identity);
Invoke ("Spawn", Random.Range (spawnMin, spawnMax));
}