☰

使用 Tikz 3D Plot 时出现“缺少字符...在 nullfont 中”错误

tag-icon • tag-icon tikz-pgf tikz-3dplot
使用 Tikz 3D Plot 时出现“缺少字符...在 nullfont 中”错误

pdflatex当我使用 Tikz 3D Plot 和版本编译这个最小示例时pdfTeX 3.141592653-2.6-1.40.25 (TeX Live 2023/Arch Linux)，我得到了一系列“缺少字符：nullfont 中没有”。这是最小的例子：

\documentclass[]{article}
\usepackage{tikz,tikz-3dplot}
\usetikzlibrary{calc}
\tdplotsetmaincoords{70}{110}

\begin{document}
\begin{tikzpicture}
  \node (P1) at (-5.0, -1.0) {};
  \node (P2) at (5.0, 1.0) {};
  \clip (P1) rectangle (P2);
  \shade[ball color=blue] (0, 0) circle (1);
  \pgfmathsetmacro{\rt}{10}
  \pgfmathsetmacro{\start}{(90/32)*(-16)}
  \pgfmathsetmacro{\angle}{(90/32)*(\rt-16)}
  \pgfmathsetmacro{\cstart}{cos(\start)}
  \pgfmathsetmacro{\sstart}{sin(\start)}
  \pgfmathsetmacro{\cangle}{cos(\angle)}
  \pgfmathsetmacro{\sangle}{sin(\angle)}
  \begin{scope}[tdplot_main_coords]
    \tdplotdefinepoints(0,0,0)(\cstart,\sstart,0)(\cangle,\sangle,0)
    % FIXME: This is not working for some bizarre reason. It used to work in an older version!
    \tdplotdrawpolytopearc[red, thick]{1}{}{}
  \end{scope}
\end{tikzpicture}

转储到终端的错误是：

Missing character: There is no - in font nullfont!
Missing character: There is no - in font nullfont!
Missing character: There is no + in font nullfont!
Missing character: There is no + in font nullfont!
Missing character: There is no ( in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no . in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no . in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no , in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no . in font nullfont!
Missing character: There is no 4 in font nullfont!
Missing character: There is no 7 in font nullfont!
Missing character: There is no 1 in font nullfont!
Missing character: There is no 3 in font nullfont!
Missing character: There is no 9 in font nullfont!
Missing character: There is no ) in font nullfont!
Missing character: There is no ; in font nullfont!
angles for cross product: phi: 0theta: 0.0

在之前的 PDFLaTeX 版本中，这个功能可以顺利运行，没有出现这些错误。不过，渲染后的图像看起来还不错。

知道如何修复它吗？

答案1

在我看来，这是无害的。在 tikz-3dplot.sty 中，注释字符被遗忘了：

    %DEBUG: show the cross product
    %\draw[->,blue] (\tdplotvertexx,\tdplotvertexy,\tdplotvertexz) 
        -- ++(\tdplotresx,\tdplotresy,\tdplotresz); %<------------- here

最后一行应该被注释掉，因为它现在以 nullfont 格式打印一些字符，从而导致出现消息。

相关内容