Joomla 3 How to set a multi controller view and model

<?php
    defined('_JEXEC') or die('Restricted access');
    class MycontrollerControllerSubcontrollername extends JControllerLegacy{
        //controllers/subcontrollername
        public function taskname($cachable = false){
            $view = & $this->getView( 'viewname', 'html' );
            // views/viewname/

            $view->setLayout( 'layout' );
            // views/viewname/tmpl/layout.php

            if ($model = & $this->getModel( 'modelname' )) $view->setModel( $model, true );
            //models/modelname.php

            $view->display();
            //parent::display($cachable); //ignore this now
        }
    }
?>

//url   option=com_mycontroller&task=subcontroller.taskname