
plot3dc: Magnitude colored plot surface with contour. 

DESCRIPTION:

	Identical to plot3d but with extra functionalities: the surface mesh
	can be colored accordingly to the current z value being plotted, a
	contour plot can be drawn at the base XY plane, and a curtain can be
	drawn between the plotted function border and the base XY plane. The
	arguments are identical to plmeshc. The only difference between
	plmeshc() and plot3dc() is that plmeshc() draws the botton side of the
	surface, while plot3dc() only draws the surface as view from the top. 

SYNOPSIS:

plot3dc(x, y, z, nx, ny, opt, clevel, nlevel)
