Adding a contour to your scene

To add a (default) contour to your scene

1. In the Attribute Editor of the shading group node for your material shader, select Enable Contour Rendering under the Contours section.
2. In the Render Settings: mental ray tabs, Features tab expand the Contours section and select Enable Contour Rendering.
3. Select how you want your contours to behave with geometry by checking the applicable options under Draw By Property Difference under the Contours section.
4. Tweak the contour attributes to achieve the look that you desire.

To add a contour shader to your scene

1. In the Attribute Editor of the shading group node for your material shader, map your mental ray contour shader, such as contour_shader_depthfade, to the Contour Shader attribute under the Custom Shaders section.
2. Tweak the contour shader attributes to achieve the look that you desire.
3. In the Render Settings: mental ray tabs, Features tab, expand the Contours section. Under the Custom Shaders section, map your custom contrast shader, for example, contour_contrast_function_levels, to the Contrast Shader attribute. Map your custom store shader, for example, contour_store_function to the Store Shader attribute.
4. Tweak the contour shader attributes to achieve the look that you desire.

For a description of the node attributes for the mental ray contour shaders, see mental ray for Maya nodes.