\def\baseI{0.461332 0.437354 0.458376 0.336186 0.447947 0.256204 0.427089 0.194699 0.393339 0.149288 0.343741 0.117345 0.275666 0.0964051 0.186405 0.0839234 0.0733303 0.077354 0.0733303 0.00131387 1.26131 0.00131387 1.26131 0.077354 1.15029 0.0842518 1.06169 0.0975547 0.99312 0.11948 0.94229 0.152327 0.906816 0.19823 0.884398 0.259571 0.872655 0.338485 0.869288 0.437354 0.869288 2.21329 0.872327 2.31192 0.883248 2.39042 0.904681 2.45127 0.939252 2.49676 0.989589 2.52928 1.05824 2.55129 1.14799 2.56516 1.26131 2.57329 1.26131 2.64933 0.0733303 2.64933 0.0733303 2.57329 0.187555 2.56418 0.277308 2.55022 0.345465 2.52862 0.394818 2.49676 0.428157 2.45201 0.44844 2.39157 0.45854 2.3129 0.461332 2.21329 } \psset{lightsrc=40 20 25,viewpoint=50 10 20 rtp2xyz,Decran=30} \begin{pspicture}(-6,-2)(6,6) \psframe(-6,-2)(6,6) \psSolid[object=grille,base=0 4 -10 10,hue=0 1,grid]% \psSolid[object=prisme,h=1,hue=0 1,incolor=yellow, base=\baseI,ngrid=1,decal=1,RotZ=90,RotX=90,unit=4](0,-1,0) \end{pspicture}