add a ground to labyrinth

java/org/artisanlogiciel/games/stl/Wall3d.java

@@ -28,6 +28,7 @@ public class Wall3d
     public final static Wall3d West = new Wall3d(1, 10, 10, 0, 0, 0);
     public final static Wall3d North = new Wall3d(10, 1, 10, 0, 10, 0);
     public final static Wall3d East = new Wall3d(1, 10, 10, 10, 0, 0);
+    public final static Wall3d Ground = new Wall3d(10, 10, 2, 0, 0, 0);
 
     int triangle[][][] = null;
 
@@ -199,8 +200,10 @@ public class Wall3d
                 {
                     stream.write(new Wall3d(East, x * xl, y * yl, 0).toString().getBytes());
                 }
+		stream.write(new Wall3d(Ground, x * xl, y * yl, 0).toString().getBytes());
             }
         }
+
         stream.write("endsolid wall\n\n".getBytes());
     }