\begin{center}
\psset{lightsrc=40 20 25,viewpoint=50 30 10 rtp2xyz,Decran=30,deactivatecolor}
\begin{pspicture}(-5,-5)(5,5)
\rput(-1,0){%
\psSolid[object=datfile,file=V1,unit=2]
\psSolid[object=grille,base=-4 8 0 10,ngrid=1,action=draw,unit=0.5]%
\psSolid[object=datfile,file=V2,unit=2]}
\rput(-3.5,3){%
\psSolid[object=datfile,file=L1]
\psSolid[object=grille,base=-4 8 -4 10,ngrid=1,action=draw,unit=0.25]%
\psSolid[object=datfile,file=L2]}
\rput(3,3){%
\psset{lightsrc=40 20 25,viewpoint=50 10 20 rtp2xyz,Decran=30}
\psSolid[object=datfile,file=S1]
\psSolid[object=grille,base=-4 8 -4 10,ngrid=1,action=draw,unit=0.25]%
\psSolid[object=datfile,file=S2]}
\rput(3,-3){%
\psSolid[object=datfile,file=G1]
\psSolid[object=grille,base=-4 8 -2 12,ngrid=1,action=draw,unit=0.25]%
\psSolid[object=datfile,file=G2]}
\rput(-3.5,-3){%
\psset{lightsrc=40 20 25,viewpoint=50 10 20 rtp2xyz,Decran=30}
\psSolid[object=datfile,file=S3]
\psSolid[object=grille,base=-4 8 -4 10,ngrid=1,action=draw,unit=0.25]%
\psSolid[object=datfile,file=S4]}
\end{pspicture}
\end{center}