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gnuplot でポン・デ・リング ref: https://qiita.com/xr0038/items/ddbecc69902888b4fa4a
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splot Z(x,y) t "Z は座標 (x,y) での z 座標を返す関数" |
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R(u,v) = 2 + 1.5*abs(cos(4*u)) | |
C(u,v) = 8 + 0.5*abs(cos(4*u)) | |
X(u,v) = (C(u,v)+R(u,v)*cos(v))*cos(u) | |
Y(u,v) = (C(u,v)+R(u,v)*cos(v))*sin(u) | |
Z(u,v) = R(u,v)*sin(v) | |
set xtics format ""; set ytics format ""; set ztics format "" | |
set xrange [-15:15]; set yrange [-15:15]; set zrange [-4.5:4.5] | |
set cbr [-3.5:3.5] | |
set grid x y | |
set contour; set cntrparam levels discrete 0 | |
set title "ポン・デ・リング" font "M+ 1c Bold, 32" offset 0,-5 | |
set isosample 250 # 3D plot で使用するメッシュの細かさを指定する | |
set ticslevel 1.0 # 3D plot で z 軸のスペースを調整 | |
set view equal xyz # 3D plot で軸の縮尺を同一にする | |
set hidden3d # 3D plot で陰線処理を有効に(重たくなるので注意) | |
set pm3d depthorder # 3D plot (pm3d) で視線方向の奥行を考慮 | |
set palette define (-3.5 'brown', -0.5 'dark-orange', 2.5 'tan1', 3 'white') | |
splot X(u,v),Y(u,v),Z(u,v) w pm3d not |
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C(u,v) = 8 + 0.5*abs(cos(4*u)) | |
X(u,v) = C(u,v)*cos(u) | |
Y(u,v) = C(u,v)*sin(u) | |
Z(u,v) = 0 | |
set xrange [-15:15] | |
set yrange [-15:15] | |
set zrange [-4.5:4.5] | |
set grid x y | |
set isosample 30 # 3D plot で使用するメッシュの細かさを指定する | |
set ticslevel 0 # 3D plot で z 軸の余計なスペースを消す | |
set view equal xyz # 3D plot で軸の縮尺を同一にする | |
set hidden3d # 3D plot で陰線処理を有効に(重たくなるので注意) | |
splot X(u,v),Y(u,v),Z(u,v) t "ポン・デ・リングの芯だけをプロット" |
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R(u,v) = 2 + 1.5*abs(cos(4*u)) | |
C(u,v) = 8 + 0.5*abs(cos(4*u)) | |
X(u,v) = (C(u,v)+R(u,v)*cos(v))*cos(u) | |
Y(u,v) = (C(u,v)+R(u,v)*cos(v))*sin(u) | |
Z(u,v) = R(u,v)*sin(v) | |
set xrange [-15:15] | |
set yrange [-15:15] | |
set zrange [-4.5:4.5] | |
set grid x y | |
set isosample 50 # 3D plot で使用するメッシュの細かさを指定する | |
set ticslevel 0 # 3D plot で z 軸の余計なスペースを消す | |
set view equal xyz # 3D plot で軸の縮尺を同一にする | |
set hidden3d # 3D plot で陰線処理を有効に(重たくなるので注意) | |
splot X(u,v),Y(u,v),Z(u,v) t "ポン・デ・リングをプロット" |
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set parametric | |
set xrange [-1.5:1.5] | |
set yrange [-1.5:1.5] | |
set zrange [-1.5:1.5] | |
set urange [0:2*pi] | |
set vrange [0:2*pi] | |
set isosample 30 # 3D plot で使用するメッシュの細かさを指定する | |
set ticslevel 0 # 3D plot で z 軸の余計なスペースを消す | |
set view equal xyz # 3D plot で軸の縮尺を同一にする | |
splot cos(u)*cos(v),sin(u)*cos(v),sin(v) \ | |
t "(u,v) を引数にとって x,y,z 座標を返す関数をそれぞれ与える" |
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