load("docdraw.mac");

docdraw3d("figures/draw_user_preamble2",
          contour=both,
          surface_hide=true,enhanced3d=true,wired_surface=true,
          contour_levels=10,
          user_preamble="set for [i=1:8] linetype i dashtype i linecolor 0",
          explicit(sin(x)*cos(y),x,1,10,y,1,10)
);
