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% arara: indent: {overwrite: on, silent: yes}
\documentclass{article}
\usepackage{pst-solides3d}
\begin{document}
\begin{pspicture}(-3,-4)(3,6)
\psset{viewpoint=20 40 40 rtp2xyz,Decran=30,lightsrc=20 10 10}
\defFunction[algebraic]{torus}(u,v)
{(2+cos(u))*cos(v+\Pi)}
{(2+cos(u))*sin(v+\Pi)}
{sin(u)}
\psSolid[object=surfaceparametree,
base=-10 10 0 6.28,fillcolor=black!70,incolor=orange,
function=torus,ngrid=60 0.4,
opacity=0.25]
\end{pspicture}
\end{document}
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