\definecolor{Tan}{cmyk}{0.14,0.42,0.56,0}
\psset{lightsrc=50 10 80}
\begin{pspicture*}(-2,-1)(6,6)
\psset{viewpoint=50 -10 10 rtp2xyz,Decran=70}
\psframe*[linecolor=blue!20](-2,-1)(6,6)
\psSolid[object=grille,base=-4 5 -6 6,action=draw**,fillcolor=green!20]%
\psSolid[object=new,RotX=0,RotZ=-45,fillcolor=gray,unit=5,linewidth=0.5\pslinewidth,
   sommets= (sommets_retriever.dat) run,
   faces={(faces_retriever.dat) run}]%
%\axesIIID(0,0,0)(4,6,5)
\end{pspicture*}