Painting the Forest Spirit - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 570

9. Lastly we will assign a Lambert shader to the backdrop. We assign a Lambert shader to the backdrop so
there are no specular reflections/highlights on the background itself. The Lambert shader is flat shading,
only with no shine. Click the Channel box tab at the right side of the screen or press Ctrl + A to switch
from the Attribute Editor to the channel box. Under the Layer menu at the lower right corner of the screen
right click and hold on the backdrop layer and, from the popup menu, select Objects.
10. The backdrop is now selected. Remember we cannot directly click on the backdrop geometry to select
it at this time because the layer is set to reference. Right click and hold on the backdrop in the viewport
menu. From the popup menu, select Assign Favorite Material ⇒ Lambert. The shader will appear in the
Attribute Editor on the right side of the screen. Set the color to RGB 0.453 0.453 0.453.
That completes the shader assignments. We are now ready to create render passes to ensure that we get
the images from Maya we need for export.
Setting Up Render Pass Layers
Maya allows you to create various render layers that control the type of image output by the renderer. We
will use these render layers to create a normal base render, an ambient occlusion pass, and a matter pass for
our render.