For more information about render nodes and connections, see About shading networks.
         
         To automatically connect nodes
         
         
            - If you drag and drop rendering nodes on top of each other, Maya automatically connects them in a default way. The default
               depends on the type of node. For example:
                  - Middle-mouse button drag a 2D or 3D texture swatch over a material to automatically connect the texture’s output color to
                     the material’s output color. 
                  
- Middle-mouse button drag a  utility node over a material node to automatically connect the bump map to the material’s  attribute.