8.12 3d hidden

set samples 20
set isosamples 20
set hidden3d
set title "hidden line removal of explicit surfaces"
set view 60,30
set xrange [-3:3]
set yrange [-3:3]
splot sin(x) * cos(y)

set samples 20
set isosamples 20
set hidden3d
set title "hidden line removal of explicit surfaces"
set xrange [-3:3]
set yrange [-3:3]
set view 75,230
set contour
splot sin(x) * cos(y)

gnuplot 提供 3d 中消去隐藏线的功能，使图形更具立体感。