Orient surfaces so they face toward or away from the camera.
This may be necessary before using tools that depend on surface orientation such as Ambient Occlusion, Offset and Parting Line.
Reversing the orientation of a surface does not affect the U or V parametric directions, and preserves construction history.
All surfaces in the scene are shaded in blue and yellow.
Surfaces facing toward the camera are shaded in blue; surfaces facing away from the camera are shaded in yellow.
The color of the surface changes immediately.
After orienting all the surfaces to face toward the camera, all the surfaces in the scene should be blue.