public override bool RunImp(Task task, AppEnv appEnv, bool withChildren)
        {
            string tempDir = string.Empty;
            string surfaceL0filename = string.Empty;
            string navMeshfilename = string.Empty;
            if (appEnv.terrainConfig.VectorData5)
            {
                tempDir = appEnv.TempDir + @"export-lsa4-with-vector-data-5\";
                surfaceL0filename = tempDir + "surface-L0.ofsh";
            }
            else
            {
                tempDir = appEnv.TempDir + @"export-surface\";
                surfaceL0filename = tempDir + "surfaceL0.ofsh";
            }

            Command command = new Command();
            command.Type = Command.CommandType.EDTU4;
            command.EdtuCommand = "build-navigation-mesh";
            //navMeshfilename =  + "navigationMesh.navmesh";
            command.Args = surfaceL0filename + " " + navMeshfilename;
            command.ErrorsFile = tempDir + @"export-vector-data_errors.ofsh";
            task.AddCommand(command);

            return true;
        }