World altitude set in setparent.

src/engine/objects/Zone.java

@@ -251,10 +251,12 @@ public class Zone extends AbstractGameObject {
             this.maxLvl = this.parent.maxLvl;
         }
 
+        this.worldAltitude = ZoneManager.caclulateWorldAltitude(this);
+
         this.setBounds();
 
         if (this.getParent() == null) {
-            this.seaLevel = 0;
+            this.seaLevel = MBServerStatics.SEA_FLOOR_ALTITUDE;
             return;
         }