One of the most important sections of the rendering mask is the Mode selecttor. mental ray® 3.14 allows, in fact, to use 3 different modes: Progressive, Unified or Compatibility.
Progressive: in Progressive mode (which is the default mode when you install the Program, and is the one Maticad suggests if you want to optimize speed during the rendering process) the engine keeps elaborating the image 'till you reach the selected quality. Nevertheless, if you want, you can specify a time limit for the process, with the group of controls available on the right of the Quality selector (we strongly suggest you to set a time limit if you are creating Jobs to be sen to Render Manager).
Unified: Unified allows you to optimize quality as much as possible; in this case the only available parameter is the Quality selector. Engine will terminate rendering process just when the required quality level has been reached (see next paragraph).
Compatibility: Compatibility mode is the native mode in case you load a project made with a previous version of the Program. If you want to use the new engine modes with an old project, click “Restore factory parameters” button, and the Application will set the correct parameters value for the new version of the rendering engine.