Any argument rebuilds world altitude.

src/engine/devcmd/cmds/GetHeightCmd.java

@@ -36,6 +36,11 @@ public class GetHeightCmd extends AbstractDevCmd {
         heightmapZone = HeightMap.getNextZoneWithTerrain(currentZone);
         parentZone = HeightMap.getNextZoneWithTerrain(currentZone.getParent());
 
+        // Any argument rebuilds altitude
+
+        if (words[0].isEmpty() == false)
+            currentZone.generateWorldAltitude();
+
         float currentHeight = HeightMap.getWorldHeight(currentZone, playerCharacter.getLoc());
         float parentHeight = HeightMap.getWorldHeight(parentZone, playerCharacter.getLoc());