AutoCAD 2008 User's Guide > Create Realistic Images and Graphics > Render 3D Objects for Realism > Prepare a Model for Rendering > Understand Face Normals and Hidden Surfaces > 
Understand Face Normals and Hidden Surfaces
Concept Procedure Quick Reference
 
 
 

To make sure both normals of a face get rendered

  1. Click View menu Render Advanced Render Settings.
  2. In the Materials section of the Advanced Render Settings palette, make sure Force 2-Sided in set to On.
  3. Render the scene.
 Toolbar: Render
 Command entry: RPREF
 Dashboard: Render panel - expanded Advanced Render Settings