Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 34

blue lines under the surface are the horizontal alignments from which
the profiles were created.
Change the visual style of the surface
1 Click View panel Views panel Visual Styles drop-down 3D
Wireframe.
AutoCAD visual styles give a fast, basic visualization of an object that is
useful for on-screen presentation in AutoCAD Civil 3D. The 3D Wireframe
visual style displays the surface in model view without applying a fill
material to the object.
22 | Chapter 2 Getting Started Tutorials