%@AUTEUR: Manuel Luque

\psset{viewpoint=25 10 30,SphericalCoor,Decran=20}
\begin{pspicture*}(-4,-3)(3.5,3)
\psframe(-4,-3)(3.5,3)
\psSolid[object=grille,base=-4 4 -4 4,action=draw](0,0,-0.5)
\psSolid[r1=3,r0=0.5,object=tore,ngrid=5 5]%
\end{pspicture*}