\documentclass[a4paper]{article} \usepackage{pst-solides3d} \pagestyle{empty} \begin{document} %@AUTEUR: Manuel Luque \psset{viewpoint=25 10 30,SphericalCoor,Decran=20} \begin{pspicture*}(-4,-3)(3.5,3) \psframe(-4,-3)(3.5,3) \psSolid[object=grille,base=-4 4 -4 4,action=draw](0,0,-0.5) \psSolid[r1=3,r0=0.5,object=tore,ngrid=5 5]% \end{pspicture*} \end{document}