void d3base (isbase, color) D#PLT.C Level 3
int isbase = 1, the 3-D surface will be connected to the x-y plane at its four corners and the x-y plane will be outlined.
= 0 (the default), the x-y plane will not be drawn.
int color The color number for the base.
This function was previously called base(), but that name conflicted with a key word in some compiler libraries.