错误报告
可以修复吗？
我已经安装了最新版本的gmshv4.5.6 (http://gmsh.info/) 我正在尝试从luamesh包中使用 MWE。我正在使用位于子文件夹中的 2017-02-09 包 v 0.5中的maillage.geo和文件。maillage.mshluamesh/texlive/2020/texmf-dist/doc/lualatex/luamesh/
我使用的luamplib是 2020-02-24 的 v2.20.5。TeXLive 2020，Xubuntu 18.04。
此代码运行良好：
\documentclass{article}
\usepackage{luamesh}
\begin{document}
\drawGmsh[tikz]{maillage.msh}
\end{document}
此代码未生成预期的 PDF 文件：
\documentclass{article}
\usepackage{luamesh}
\begin{document}
\drawGmsh{maillage.msh}
\end{document}
该文件的格式maillage.msh为版本 2 ASCII。如果我们尝试msh以版本 4 ASCII（默认选项）导出，则这两个示例都不起作用。
概括
版本 2 ASCII [tikz]：一切运行良好。
版本 2 ASCII 不包含[tikz]：
! Undefined control sequence.
\\drawGmsh ...eshvaldg@color ")}\else \mplibcolor
{\luameshmpcolor }{\luames...
l.4 \drawGmsh{maillage-version2.msh}
版本 4 ASCII 具有[tikz]：
luamesh/luamesh.lua:534: attempt to perform arithmetic on a nil value (field '?
')
stack traceback:
...pivo/texlive/2020/texmf-dist/scripts/luamesh/luamesh.lua:534: in function '
readGmsh'
.../texlive/2020/texmf-dist/scripts/luamesh/luamesh-tex.lua:767: in function '
drawGmshTikZ'
[\directlua]:1: in main chunk.
\\drawGmsh ...ldg@scale ","\luameshvaldg@color ")}
\else \mplibcolor {\luames...
l.4 \drawGmsh[tikz]{maillage-version4.msh}
版本 4 ASCII 不带[tikz]：
! Undefined control sequence.
\\drawGmsh ...eshvaldg@color ")}\else \mplibcolor
{\luameshmpcolor }{\luames...
l.4 \drawGmsh{maillage-version4.msh}
（maillage-version2.msh与最后几位小数略有不同maillage.msh，但结构相同）：
$MeshFormat
2.2 0 8
$EndMeshFormat
$Nodes
49
1 0 0 0
2 3 0 0
3 0 3 0
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5 0.927050985688588 2.853169548052449 0
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7 1.763355761304841 2.427050979908132 0
8 2.121320348549485 2.121320338569801 0
9 2.427050986323072 1.763355752475434 0
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25 1.277646354647664 0.4113155914951311 0
26 1.331385884279466 2.208153696956179 0
27 2.408333487391826 0.9570142841403682 0
28 0.4806120485258751 2.21192748111512 0
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32 0.8225535882961561 0.9953960076673578 0
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34 0.8915779045171567 1.969788703743087 0
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$EndNodes
$Elements
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55 2 2 0 6 23 31 32
56 2 2 0 6 19 20 36
57 2 2 0 6 15 16 30
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59 2 2 0 6 31 34 37
60 2 2 0 6 26 34 41
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63 2 2 0 6 23 32 35
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75 2 2 0 6 22 1 47
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80 2 2 0 6 25 40 49
81 2 2 0 6 36 38 42
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92 2 2 0 6 13 35 47
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96 2 2 0 6 43 24 48
97 2 2 0 6 35 40 47
98 2 2 0 6 5 41 46
99 2 2 0 6 38 25 49
$EndElements
看起来maillage-version4.msh像这样：
$MeshFormat
4.1 0 8
$EndMeshFormat
$Entities
3 3 1 0
1 0 0 0 0
2 3 0 0 0
3 0 3 0 0
1 0 2.220446049250313e-16 0 3 3 0 0 2 3 -2
2 0 0 0 0 3 0 0 2 1 -3
3 0 0 0 3 0 0 0 2 2 -1
6 0 0 0 3 3 0 0 3 1 3 2
$EndEntities
$Nodes
7 49 1 49
0 1 0 1
1
0 0 0
0 2 0 1
2
3 0 0
0 3 0 1
3
0 3 0
1 1 0 9
4
5
6
7
8
9
10
11
12
0.4693033963404087 2.963065021592229 0
0.927050985688588 2.853169548052449 0
1.361971502971016 2.673019570653173 0
1.763355761304841 2.427050979908132 0
2.121320348549485 2.121320338569801 0
2.427050986323072 1.763355752475434 0
2.673019574643209 1.361971495140128 0
2.853169549732512 0.9270509805178855 0
2.963065021991164 0.4693033938216338 0
1 2 0 5
13
14
15
16
17
0 0.499999999997822 0
0 0.9999999999960245 0
0 1.499999999994285 0
0 1.999999999996158 0
0 2.499999999998079 0
1 3 0 5
18
19
20
21
22
2.500000000003167 0 0
2.000000000001941 0 0
1.500000000004168 0 0
1.00000000000281 0 0
0.5000000000014051 0 0
2 6 0 27
23
24
25
26
27
28
29
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31
32
33
34
35
36
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38
39
40
41
42
43
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48
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0.4204627438899584 0.7566691502573124 0
1.736929708778206 0.4257397652798222 0
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1.524726655147985 0.8206048256661349 0
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1.677597399498234 1.959155701651377 0
2.21890810757101 1.334757699095549 0
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$EndNodes
$Elements
7 99 1 99
0 1 15 1
1 1
0 2 15 1
2 2
0 3 15 1
3 3
1 1 1 10
4 3 4
5 4 5
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13 12 2
1 2 1 6
14 1 13
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1 3 1 6
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2 6 2 74
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42 13 14 35
43 30 28 34
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93 4 5 46
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99 38 25 49
$EndElements
观察结果
文件的结构
msh发生了变化，比较版本 2 和版本 4，luamesh包正在崩溃。我猜想包
luamplib在某个时候发生了变化，也许某些切换选项会对未知的颜色命令有所帮助？添加\usepackage{xcolor}没有帮助。
更新 1
tikz尽管文档中有许多多余的字符，但这在一定程度上帮助了没有的版本 2 ：
\let\mplibcolor=\mpcolor
\def\luameshmpcolor{black}
更新 2
这是针对版本 2 的解决方法，无需tikz：
\documentclass{article}
\usepackage{xcolor}
\usepackage{luamesh}
\def\mplibcolor#1{}
\def\luameshmpcolor{blue}
\begin{document}
\drawGmsh[color=]{maillage-version2.msh}
\end{document}
更新 3
这是从格式 4 到格式 2 的转换：
gmsh maillage-version4.msh -save -format msh2 -o maillage-v4-to-v2.msh
此后这对我有用/Metapost/：
\documentclass{article}
\usepackage{luamesh}
\def\mplibcolor#1{}
\def\luameshmpcolor{blue}
\begin{document}
\drawGmsh[color=]{maillage-v4-to-v2.msh}
\end{document}
这部分对我来说和 TikZ 一起工作：
\documentclass{article}
\usepackage{luamesh}
%\def\mplibcolor#1{}
%\def\luameshmpcolor{blue}
\begin{document}
\drawGmsh[tikz,color=blue]{maillage-v4-to-v2.msh}
\end{document}
答案1
感谢您的报告。我更新了软件包（至版本 0.6），我不知道 luamplib 的变化，也不知道新的 MSH ASCII 文件格式。现在一切都正常（版本 0.6）：