\documentclass{article} \usepackage{pst-solides3d} \begin{document} \pagestyle{empty} \begin{pspicture}(-6,-4)(7,12) \psset{viewpoint=50 40 30 rtp2xyz,Decran=50} \psset{lightsrc=viewpoint,linewidth=0.5\pslinewidth} \psSolid[object=grille,base=-4 4 -4 4,action=draw]% \psSurface[ fillcolor=cyan!50, % tracelignedeniveau=true, % hauteurlignedeniveau=5, % linewidthlignedeniveau=3, % couleurlignedeniveau=blue, intersectionplan={[0 0 1 -5]}, intersectioncolor=(bleu), intersectionlinewidth=3, intersectiontype=0, ngrid=.25 .25,incolor=yellow, axesboxed,Zmin=0,Zmax=8,QZ=4](-4,-4)(4,4){% y dup mul x dup mul add 4 div } \end{pspicture} \end{document}