Is it possible to add a black rectangle (in the z = 0 plane) to a splot in gnuplot? I've tried splotting:
splot 0
which led to (with different parameters) all sorts of different colours when adjusting the range and the pm3d option. I did find the option to plot rectangles in 2d:
set object rectangle from 0,0,0 to my maximum
Does the 3d environment also have a draw tool somehow?
Thanks in advance.