# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'hidden.5.png'
set style increment default
set view 75, 230, 1, 1
set samples 20, 20
set isosamples 20, 20
set contour base
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set title "Hidden line removal of explicit surfaces" 
set xrange [ -3.00000 : 3.00000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set yrange [ -3.00000 : 3.00000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ -1.00000 : 1.00000 ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
splot sin(x) * cos(y)