You can now see visual representations of mental ray for Maya shading nodes in swatch form in Maya. For example, you can now
            view mental ray for Maya custom shaders, when the appropriate renderer (mental ray for Maya renderer) is selected. 
         
         Note 
                  - In mental ray for Maya, swatch rendering is supported for: material shaders, procedural texture shaders, sample compositing
                     shaders, and data conversion shaders. 
                  
- For interactivity, mental ray shader swatches are rendered in low rendering quality.
- To maintain maximum performance when IPR is running, swatches in  are not updated.