\psset{unit=0.8}
\psset[pst-solides3d]{viewpoint=40 30 30,SphericalCoor,Decran=30}
\psset{%
   incolor=yellow!50,fillcolor=green!25,
   linecolor={[cmyk]{1,0,1,0.5}}}
\begin{pspicture}(-8,-9)(7,5)
\psframe*[linecolor=gray](-8,-9)(7,5)
\psSolid[object=grille,base=-6 6 -6 6,linecolor=red,
    linewidth=0.5\pslinewidth,ngrid=12](0,0,-6)
%\psSolid[object=grille,base=-6 6 -6 3,RotX=-90,linecolor=red,
%   linewidth=0.5\pslinewidth](0,-6,-3)%
%\psSolid[object=grille,base=-6 3 -6 6,RotY=90,
%   linecolor=red,linewidth=0.5\pslinewidth](-6,0,-3)%
\psTorusMagic[R=3,r=1.5,angularAperture=180,
    torusMagic,projectionXY,projectionXZ,projectionYZ]%
\psTorusMagic[R=3,r=1.5,angularAperture=180,linecolor=red]%
\gridIIID[Zmin=-6,Zmax=3,QZ=-1.5,linecolor=black](-6,6)(-6,6)
\end{pspicture}