fig07.tex

\documentclass[a4paper]{article}
\usepackage{pst-torusmagic}
\usepackage{pst-eucl}
\usepackage[garamond]{mathdesign}
\renewcommand{\ttdefault}{lmtt}
\pagestyle{empty}
\begin{document}
 
\psset{unit=0.8}
\psset[pst-solides3d]{viewpoint=40 10 20,
    SphericalCoor,Decran=40,lightsrc=10 10 30}
\begin{pspicture}(-8,-8)(8,8)
\psframe*[linecolor=gray!50](-8,-8)(8,8)
\psSolid[object=grille,base=-6 6 -6 6,linecolor=red,
    ngrid=12,linewidth=0.5\pslinewidth](0,0,-3)
\psTorusMagicSolid[R=3,r=3,angularAperture=85,
   linecolor={[cmyk]{1,0,1,0.5}},
   incolor=yellow!50,linewidth=0.5\pslinewidth,
   base=0 360 -150 120]%
\gridIIID[Zmin=-3,Zmax=3](-6,6)(-6,6)
\end{pspicture}
 
\end{document}