用gnuplot图绘制三角形网格
用gnuplot图绘制三角形网格
提问于 2017-03-14 11:09:31
通常需要用gnuplot绘制三角形网格。
我目前看到的唯一方法是使用with lines选项制作“线框”，并在闭线链(第一点和最后一点相同)之间为每个方面创建双新行：
$wireframe <<EOD
0 1 1 p1
1 -1 1 p2
-1 -1 1 p3
0 1 1
2 1 0 p4
0 1 1
1 -1 1
2 1 0
0 -2 0 p5
1 -1 1
-1 -1 1
0 -2 0
-2 1 0 p6
-1 -1 1
0 1 1
-2 1 0
EOD
splot '$wireframe' with lines notitle, '' with labels offset character 0, character 1 notitle这是四个三角形:一个在中心(p1，p2，p3)和3个在它的腿附近。
在某些定义网格的方法中有许多重复。有时将网格定义为三角形条形或三角形扇形是比较合适的方法。
另一个问题是用某种颜色填充三维三角形的内部。目前，我只能用不同的颜色(从调色板)为不同的链状线绘制线框。但它们重叠。
我想画二十面体。它是封闭的实体，受三角形面的约束。
回答 2
Stack Overflow用户
回答已采纳
发布于 2017-03-15 03:57:51
set terminal wxt size 800,600
#set title "Graph Title"
#set xlabel "X"
#set ylabel "Y"
#set zlabel "Z"
# sets background color
set object 1 rectangle from screen -0.1,-0.1 to screen 1.1,1.1 fillcolor rgb "#ffffff" behind
# allows rendering of polygons with hidden line removal
set hidden3d back offset 0 trianglepattern 3 undefined 1 altdiagonal bentover
# displays borders 0x7F = 0b1111111
set border 0x7F linecolor rgb "#555555"
# displays the x, y and z axis
set xzeroaxis linewidth 0.5 linetype 1
set yzeroaxis linewidth 0.5 linetype 2
set zzeroaxis linewidth 0.5 linetype 3
# displays the x, y and z grid
set grid xtics linecolor rgb "#888888" linewidth 0.2 linetype 9
set grid ytics linecolor rgb "#888888" linewidth 0.2 linetype 9
set grid ztics linecolor rgb "#888888" linewidth 0.2 linetype 9
# moves the x, y grid to 0
set xyplane at 0
# makes the x, y, and z axis proportional
set view equal xyz
# sets the axis range
set xrange [-10:10]
set yrange [-10:10]
set zrange [-10:10]
# moves the key out of the graph
set key outside vertical bottom right
# hides the key
set key off
splot\
"ico.dat" title "ico" with lines linewidth 2.1 linecolor rgb "#88FF88"ico.dat：
-1.381925 -4.253200 -2.236075
0.000000 0.000000 -5.000000
3.618000 -2.628600 -2.236075
3.618000 -2.628600 -2.236075
3.618000 -2.628600 -2.236075
0.000000 0.000000 -5.000000
3.618000 2.628600 -2.236075
3.618000 2.628600 -2.236075
-4.472125 0.000000 -2.236075
0.000000 0.000000 -5.000000
-1.381925 -4.253200 -2.236075
-1.381925 -4.253200 -2.236075
-1.381925 4.253200 -2.236075
0.000000 0.000000 -5.000000
-4.472125 0.000000 -2.236075
-4.472125 0.000000 -2.236075
3.618000 2.628600 -2.236075
0.000000 0.000000 -5.000000
-1.381925 4.253200 -2.236075
-1.381925 4.253200 -2.236075
3.618000 -2.628600 -2.236075
3.618000 2.628600 -2.236075
4.472125 0.000000 2.236075
4.472125 0.000000 2.236075
-1.381925 -4.253200 -2.236075
3.618000 -2.628600 -2.236075
1.381925 -4.253200 2.236075
1.381925 -4.253200 2.236075
-4.472125 0.000000 -2.236075
-1.381925 -4.253200 -2.236075
-3.618000 -2.628600 2.236075
-3.618000 -2.628600 2.236075
-1.381925 4.253200 -2.236075
-4.472125 0.000000 -2.236075
-3.618000 2.628600 2.236075
-3.618000 2.628600 2.236075
3.618000 2.628600 -2.236075
-1.381925 4.253200 -2.236075
1.381925 4.253200 2.236075
1.381925 4.253200 2.236075
4.472125 0.000000 2.236075
1.381925 -4.253200 2.236075
3.618000 -2.628600 -2.236075
3.618000 -2.628600 -2.236075
1.381925 -4.253200 2.236075
-3.618000 -2.628600 2.236075
-1.381925 -4.253200 -2.236075
-1.381925 -4.253200 -2.236075
-3.618000 -2.628600 2.236075
-3.618000 2.628600 2.236075
-4.472125 0.000000 -2.236075
-4.472125 0.000000 -2.236075
-3.618000 2.628600 2.236075
1.381925 4.253200 2.236075
-1.381925 4.253200 -2.236075
-1.381925 4.253200 -2.236075
1.381925 4.253200 2.236075
4.472125 0.000000 2.236075
3.618000 2.628600 -2.236075
3.618000 2.628600 -2.236075
1.381925 -4.253200 2.236075
4.472125 0.000000 2.236075
0.000000 0.000000 5.000000
0.000000 0.000000 5.000000
-3.618000 -2.628600 2.236075
1.381925 -4.253200 2.236075
0.000000 0.000000 5.000000
0.000000 0.000000 5.000000
-3.618000 2.628600 2.236075
-3.618000 -2.628600 2.236075
0.000000 0.000000 5.000000
0.000000 0.000000 5.000000
1.381925 4.253200 2.236075
-3.618000 2.628600 2.236075
0.000000 0.000000 5.000000
0.000000 0.000000 5.000000
4.472125 0.000000 2.236075
1.381925 4.253200 2.236075
0.000000 0.000000 5.000000
0.000000 0.000000 5.000000由搅拌器和python脚本生成：
Stack Overflow用户
发布于 2017-03-14 16:00:25
解决方法可以是编写gawk/Python脚本，该脚本将解析面的定义，并生成Gnuplot脚本，其中面将手动绘制为多边形：
set xr [0:1]
set yr [0:1]
set zr [0:1]
#generate the polygons
set object polygon from 0,0,0 to 1,0,0 to 1,1,0 to 0,1,0 to 0,0,0 fc rgb "cyan" fillstyle solid 1.0 border lt -1
set object polygon from 1,0,0 to 1,1,0 to 1,1,1 to 1,0,1 to 1,0,0 fc rgb "cyan" fillstyle solid 1.0 border lt -1
#do not plot anything
splot 1/0页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/42784369
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