|void survis (which)||D3PLT.C||Level 3|
|char *which||= "top" Only
the top of the surface is visible.
= "bottom" Only the bottom of the surface is visible.
= "both" Both sides of the surface will be visible.
|survis() can be used with surfun() and surmat(). By default, both sides of a 3-D surface will be made visible.|