when defining position, remember old z

src/hollywoo_flixel/FlxDirector.kiss

@@ -196,12 +196,13 @@
 (method :Void defineStagePosition [:FlxCamera camera :StagePosition->Void submit &opt :StagePosition oldPos]
     (let [db (new DebugLayer)]
         (set db.cameras [camera])
-        (db.drawCircle oldPos.x oldPos.y 4 FlxColor.YELLOW 2)
+        (when oldPos
+            (db.drawCircle oldPos.x oldPos.y 4 FlxColor.YELLOW 2))
         (FlxG.state.add db)
-    (defineFlxPoint
-        ->point
-            {(FlxG.state.remove db)
-                (submit (new StagePosition point.x point.y 5.0))})))
+        (defineFlxPoint
+            ->point
+                {(FlxG.state.remove db)
+                    (submit (new StagePosition point.x point.y (or oldPos?.z 5.0)))})))
 
 (method :Void defineLightSource [:FlxLightSource->Void submit]
     (let [points []]