LodGenerator should accept a constructor by mesh

jme3-core/src/tools/java/jme3tools/optimize/LodGenerator.java

@@ -254,6 +254,16 @@ public class LodGenerator {
         }
     };
 
+    /**
+     * Construct a LodGenerator for the given mesh
+     *
+     * @param mesh the mesh to consider to generate de Lods.
+     */
+    public LodGenerator(Mesh mesh) {
+        this.mesh = mesh;
+        build();
+    }
+
     /**
      * Construct a LodGenerator for the given geometry
      *