Method cleanup

src/engine/gameManager/ZoneManager.java

@@ -464,16 +464,14 @@ public enum ZoneManager {
         if (zone.parent == null)
             return worldAlttitude;
 
-        Zone parentZone = zone.parent;
-
         // Children of seafloor
 
-        if (parentZone.parent == null)
+        if (ZoneManager.seaFloor.equals(zone.parent))
             return worldAlttitude + zone.yOffset;
 
         // return height from heightmap engine at zone location
 
-        worldAlttitude = HeightMap.getWorldHeight(parentZone, zone.getLoc());
+        worldAlttitude = HeightMap.getWorldHeight(zone.parent, zone.getLoc());
 
         // Add zone offset to value