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I am getting different output images when using named v/s raw coordinates in tikz-3dplot. Is there way to print out what the value of coodinates are to help debug or check any log files. Minimal example below:

\documentclass{standalone} \usepackage{tikz} \usepackage{tikz-3dplot} \usepackage{calc} \begin{document} \tdplotsetmaincoords{70}{100}%right hand \begin{tikzpicture}[scale=2] \def\xmax{2} \def\ymax{2} \def\dz{0.2} \coordinate (M) at (0.5*\xmax,0.5*\ymax,0); \draw[fill=green!40!white, opacity = 0.5,tdplot_main_coords] ({0},{0},{0}) to [out=30,in=200] ({0},{\ymax},{0}) to ({\xmax},{\ymax},{0}) to[out=200,in=30] ({\xmax},{0},{0}) to ({0},{0},{-\dz}) to (M) to (0,0,0); \end{tikzpicture} \tdplotsetmaincoords{70}{100}%right hand \begin{tikzpicture}[scale=2] \def\xmax{2} \def\ymax{2} \def\dz{0.2} \draw[fill=green!40!white, opacity = 0.5,tdplot_main_coords] ({0},{0},{0}) to [out=30,in=200] ({0},{\ymax},{0}) to ({\xmax},{\ymax},{0}) to[out=200,in=30] ({\xmax},{0},{0}) to ({0},{0},{-\dz}) to (0.5*\xmax,0.5*\ymax,0) to (0,0,0); \end{tikzpicture} \end{document}

Ouput image

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You did not use tdplot_main_coords when defining the symbolic coordinate M. If you replace

\coordinate (M) at (0.5*\xmax,0.5*\ymax,0);

by

\path[tdplot_main_coords] (0.5*\xmax,0.5*\ymax,0) coordinate (M);

both results match.

\documentclass{standalone} \usepackage{tikz} \usepackage{tikz-3dplot} \begin{document} \tdplotsetmaincoords{70}{100}%right hand \begin{tikzpicture}[scale=2] \def\xmax{2} \def\ymax{2} \def\dz{0.2} \path[tdplot_main_coords] (0.5*\xmax,0.5*\ymax,0) coordinate (M); \draw[fill=green!40!white, opacity = 0.5,tdplot_main_coords] ({0},{0},{0}) to [out=30,in=200] ({0},{\ymax},{0}) to ({\xmax},{\ymax},{0}) to[out=200,in=30] ({\xmax},{0},{0}) to ({0},{0},{-\dz}) to (M) to (0,0,0); \end{tikzpicture} \tdplotsetmaincoords{70}{100}%right hand \begin{tikzpicture}[scale=2] \def\xmax{2} \def\ymax{2} \def\dz{0.2} \draw[fill=green!40!white, opacity = 0.5,tdplot_main_coords] ({0},{0},{0}) to [out=30,in=200] ({0},{\ymax},{0}) to ({\xmax},{\ymax},{0}) to[out=200,in=30] ({\xmax},{0},{0}) to ({0},{0},{-\dz}) to (0.5*\xmax,0.5*\ymax,0) to (0,0,0); \end{tikzpicture} \end{document}

enter image description here

The calc library, which gets automatically loaded by tikz-3dplot, allows you to compare the screen coordinates of named nodes/coordinates. The inofficial library 3dtools allows you to retrieve the coordinates that were used to define the node/coordinate but at this point does not store the information in which coordinate systems they were defined.

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  • Thanks @Schrodingger's cat. Based on your answer I found that passing 'tdplot_main_coords' to tikzpicture like so : also ` \begin{tikzpicture}[scale=2,tdplot_main_coords].. \end{tikzpicture}` also works. Commented Nov 28, 2019 at 15:59
  • @Haaput Of course, yes. This is what one usually does, or one uses a scope. Commented Nov 28, 2019 at 16:00

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