Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 503

First, you will apply render materials to the corridor link codes.
3 Click Corridor tab
Set Styles.
4 On the Edit Code Sets dialog box, under Code Set Style, make sure that
All Codes is selected.
In the Render Material column, examine the materials that are set for
the links that are included in the subassemblies for the current corridor.
These materials will be displayed on each link when you render the
corridor model:
Daylight_Cut: Sitework.Planting.Grass.Short
Daylight_Fill: Sitework.Planting.Grass.Short
Ditch: Sitework.Planting.Grass.Thick
Gravel: Sitework.Planting.Gravel.Mixed
Median: Sitework.Planting.Grass.Short
Pave: Sitework.Paving - Surfacing.Asphalt
Slope_Link: Sitework.Planting.Grass.Short
5 Click OK.
Hide and render corridor surfaces
1 Click View tab Views panel
The drawing is redrawn to a three-dimensional view of the corridor.
2 In Toolspace, on the Prospector tab, expand the Surfaces collection.
3 Right-click the Corridor - (1) Median surface. Click Surface Properties.
4 In the Surface Properties dialog box, on the Information tab, change the
Surface Style to Hide Surface. Click OK.
The Hide Surface style has all of its components turned off, which allows
the surface's render material to be effectively ignored. The rendering
method used in this exercise applies render materials that are assigned
to the subassembly link codes, and not the surface itself.
5 Follow steps 2 and 3 to apply the Hide Surface style to the Corridor - (1)
Pave and Corridor - (1) Top surfaces.
Modify Corridor panel drop-down
Named Views list
Exercise 3: Visualizing a Corridor | 491
Edit Code
Corridor_3D View.