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%
% 3dimagetemplate.tex
%
% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
%
\documentclass[tikz]{standalone}
\usepackage{times}
\usepackage{amsmath}
\usepackage{txfonts}
\usepackage[utf8]{inputenc}
\usepackage{graphics}
\usetikzlibrary{arrows,intersections,math}
\usepackage{ifthen}
\begin{document}
\definecolor{darkgreen}{rgb}{0,0.6,0}
\newboolean{showgrid}
\setboolean{showgrid}{false}
\def\breite{7}
\def\hoehe{4}
\begin{tikzpicture}[>=latex,thick]
% Povray Bild
\node at (0,0) {\includegraphics[width=10cm]{rodriguez.jpg}};
% Gitter
\ifthenelse{\boolean{showgrid}}{
\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
\draw (-\breite,-\hoehe) grid (\breite, \hoehe);
\fill (0,0) circle[radius=0.05];
}{}
\node[color=blue] at (0.6,3.0) {$\vec{k}\mathstrut$};
\node[color=red] at (1.8,-1.0) [below right] {$\vec{x}\mathstrut$};
\node[color=darkgreen] at (-4.5,1.0) [below left]
{$\vec{x}\times\vec{k}\mathstrut$};
\node[color=yellow] at (1.9,-0.5) [right] {$\vec{x}-(\vec{x}\cdot\vec{k})\vec{k}$};
\end{tikzpicture}
\end{document}
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