\documentclass[a4paper]{article} \usepackage{pst-solides3d} \pagestyle{empty} \begin{document} %@AUTEUR: Manuel Luque \psset{viewpoint=25 30 30,SphericalCoor,unit=1,lightsrc=20 15 15} \begin{pspicture}(-3.5,-3)(3.5,3) \psframe*(-3.5,-3)(3.5,3) \psset{Decran=20} \psSolid[object=grille,base=-4 4 -4 4,hue=0.5 0.6 0.7 1, linecolor=white](0,0,-1) \psSolid[r1=3,r0=1,object=tore,ngrid=6 72,grid,hue=0 1 0.75 1]% \end{pspicture} \end{document}