Varkon Interactive users manual
A surface has two parametric directions, U and V and consists of one or more patches in each direction. A surface with 2 patches in the U direction and 3 patches in the V direction thus has a total of 6 patches. Similar to curves, the number of patches in a surface depends on what type of surface it is and how you create it.
A surface has two sides, positive and negative. When displayed with color in a OpenGL window the positive side of a surface will become bright and shiny while the negative side will become dark and dull. Which is which depends on how you create the surface.
MBS includes many more surface methods. See the MBS entity creation index for more info.
Varkon 1.19D svn # 120M