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I have the latest update of tikz-3dplot. It is issuing a bunch of nullfont warnings. I suspect the author may have again forgot to comment all of their test code, though I have not checked. It is not present on overleaf's update, for instance. I have the latest installation, and just checked.

\documentclass{article} \usepackage{tikz,tikz-3dplot} \begin{document} \tdplotsetmaincoords{60}{130} \begin{tikzpicture}[tdplot_main_coords] \tdplotdefinepoints(0,0,0)(1,1,1)(-1,2,-3) \tdplotdrawpolytopearc[thick]{.75}{}{} \end{tikzpicture} \end{document} 
Missing character: There is no - (U+002D) in font nullfont! Missing character: There is no - (U+002D) in font nullfont! Missing character: There is no + (U+002B) in font nullfont! Missing character: There is no + (U+002B) in font nullfont! Missing character: There is no ( (U+0028) in font nullfont! Missing character: There is no - (U+002D) in font nullfont! Missing character: There is no 5 (U+0035) in font nullfont! Missing character: There is no . (U+002E) in font nullfont! Missing character: There is no 0 (U+0030) in font nullfont! Missing character: There is no , (U+002C) in font nullfont! Missing character: There is no 2 (U+0032) in font nullfont! Missing character: There is no . (U+002E) in font nullfont! Missing character: There is no 0 (U+0030) in font nullfont! Missing character: There is no , (U+002C) in font nullfont! Missing character: There is no 3 (U+0033) in font nullfont! Missing character: There is no . (U+002E) in font nullfont! Missing character: There is no 0 (U+0030) in font nullfont! Missing character: There is no ) (U+0029) in font nullfont! Missing character: There is no ; (U+003B) in font nullfont!
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    Forget my previous comment. I forgot that missing characters do not result in a error return code and therefore are not reported as error. Commented Jan 30 at 10:00
  • Sorry, I meant to say warnings @cabohah Commented Jan 30 at 10:01
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    I've the same warnings with latest versions of TeX Live 2021, 2022, 2023 and 2024, but not TeX Live 2020. But tikz-3dplot.sty is unchanged since 2010. So it seems to the result of another change, either in the LaTeX kernel or TikZ/pgf. Commented Jan 30 at 10:06
  • @cabohah It was not there for me on my local installation recently. I confirm that this code recently ran without error, and this is a recent issue. There must be a more recent update where it is not present. By recently, I mean within the last couple months. Commented Jan 30 at 10:08
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    Try from the terminal: kpsewhich tikz-3dplot.sty . Then you can edit the file directly (IMHO this is OK in this case if you have the permission to edit the file, because another update of tikz-3dplot should also correct this error). Alternatively you can also copy the file to your local/personal TEXMF tree and edit it there. But it this case, you have to remember, that you have such a copy, if the package will be updates in future. Otherwise it will be used instead of the distribution file forever. Commented Jan 30 at 10:15

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