• FaceForm[gf, gb] is a three-dimensional graphics directive which specifies that the front faces of polygons are to be drawn with the graphics primitive gf, and the back faces with gb.
• The graphics specifications gf and gb must be CMYKColor, GrayLevel, Hue or RGBColor directives, or SurfaceColor objects.
• Specifications given outside of FaceForm will apply both to the front and back faces of polygons.
• The front face of a polygon is defined to be the one for which the corners as you specify them are in counterclockwise order (right-hand rule).
• New in Version 1.