作成手順
gnuplot> set hidden3d
gnuplot> set isosamples 50
gnuplot> splot cos(u)*(2+cos(v)),sin(u)*(2+cos(v)),sin(v)
gnuplot> set terminal png
Terminal type set to 'png'
Options are 'small color picsize 640 480 '
gnuplot> set output "img-a.png"
gnuplot> splot cos(u)*(2+cos(v)),sin(u)*(2+cos(v)),sin(v)
gnuplot>
ドーナツ型
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