 Command entry:
Command entry:mental ray material 

 Advanced Shaders rollout 

 Click Contour button. 

 Choose Simple (contour).
            
 Command entry:
Command entry:Other material 

 mental Ray Connection rollout 

 Advanced Shaders group 

 Unlock Contour if necessary. 

 Click Contour button. 

 Choose Simple (contour).
            
 The Simple contour shader draws all lines the same width.
          
            Interface
            
  - Color
- 
                   
                     The color used for rendering the contour lines.
                      
 
- Width (%)
- 
                   
                     The relative thickness of the contour lines.