void OnTriggerEnter2D(Collider2D col)
 {
     if(col.gameObject.CompareTag("Player"))
     {
         Debug.Log("Player passed trigger");
         if(prev)
         {
             Destroy(prev.gameObject);
         }
         prev = terrain;
         terrain = next;
         transform.position += new Vector3(36f, 0f, 0f);
         GameObject nextGO = (GameObject)Instantiate(terrainPrefab, transform.position, Quaternion.identity);
         next = nextGO.transform;
         nextCaveGenerator = next.GetComponent<CaveGenerator>();
         //nextHillGenerator = next.GetComponent<HillGenerator>();
         nextPlatformGenerator = next.GetComponent<PlatformGenerator>();
         nextCaveGenerator.Generate();
         nextPlatformGenerator.Append();
     }
 }