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Any idea how to draw this beautiful electromagnetic tetrahedron (due to F.W. Hehl and Y.N. Obukhov) using LaTeX code?

enter image description here

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If anyone is curious, the diagram is the figure 3 from page 8 of Spacetime metric from local and linear electrodynamics: a new axiomatic scheme by Friedrich W. Hehl and Yuri N. Obukhov. The caption is: Different aspects of the electromagnetic field. The four quantities H, D, E, B constitute the electromagnetic field. The excitations H, D are extensive quantities (how much?), the field strengths E, B intensive quantities (how strong?). – przemoc Jun 18 '12 at 8:52
up vote 10 down vote accepted

My solution won't give you exactly the same result, but it is similar, thus I hope it will be acceptable for you.

        execute at begin scope={\pgfonlayer{#1}},
        execute at end scope={\endpgfonlayer}
        ball/.style={circle, shading=ball, ball color=black!15, minimum size=9mm},
        conline/.style={line width=#1, line cap=round},
        label/.style 2 args={
            postaction={decorate,transform shape,decoration={
                markings, mark=at position #1 with \node {\scriptsize\color{black}#2};
    \def\conline<#1>[#2] (#3) (#4);{%
        \draw[conline=#1, #2] (#3) -- (#4);
    \def\conwhiline (#1) (#2);{%
        \conline<10pt>[color=white] (#1) (#2);
    \def\connectpos[#1] (#2) (#3) #4 #5;{%
        \conline<8pt>[color=black] (#2) (#3);
        \conline<7pt>[#1, label={#4}{#5}] (#2) (#3);
    \def\connection[#1] (#2) (#3) #4;{%
        \connectpos[#1] (#2) (#3) 0.5 {#4};
    \node (B) [ball]                     {$\bm{B}$};
    \node (D) [ball] at ($(B)+(95:4.4)$) {$\mathcal{D}$};

    \node (H) [ball] at ($(B)+(60:2.5)$) {$\mathcal{H}$};
    \node (E) [ball] at ($(B)+(155:3)$)  {$\bm{E}$};
    \connectpos[blue] (E)     (H.180) 0.35 {1-forms};
    \conwhiline       (B)     (D);
    \connection[red]  (E.-45) (B)          {field strength};
    \connection[redl] (B)     (H.-115)     {magnetic};

    \connection[red]  (D.-40) (H)          {excitation};
    \connectpos[blue] (D)     (B)     0.35 {2-forms};
    \connection[redl] (E.60)  (D)          {electric};

enter image description here

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Good use of \def to do tikz-like commands. – fabikw Jul 12 '11 at 0:11
This is beautiful! Thanks a lot for the effort and thanks for the code! – user1999 Jul 12 '11 at 15:20

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