\def\baseZ{2.2973   0.705301
           2.25049   0.561268
           2.20779   0.456241
           2.16287   0.376752
           2.10933   0.309334
           2.0227   0.242737
           1.9088   0.193796
           1.77011   0.163577
           1.60932   0.153312
           0.581305   0.153312
           2.30929   2.58931
           2.30929   2.64933
           0.205292   2.64933
           0.12531   1.9653
           0.229352   1.9653
           0.256204   2.09242
           0.285274   2.18726
           0.32042   2.26117
           0.365338   2.3253
           0.450739   2.40109
           0.568741   2.4548
           0.719097   2.48674
           0.901314   2.49734
           1.7853   2.49734
           0.037281   0.0613412
           0.037281   0.00131387
           2.29328   0.00131387
           2.38935   0.705301 }

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\begin{pspicture}(-6,-2)(6,6)
\psframe(-5,-2)(5,6)
\psSolid[object=grille,base=0 4 -10 10,hue=0 1,grid]%
\psSolid[object=prisme,h=1,hue=0 1,incolor=yellow,
   base=\baseZ,ngrid=1,decal=2,RotZ=90,RotX=90,unit=4](0,-1,0)
\end{pspicture}