\documentclass{article} \usepackage{pst-solides3d} \makeatletter \def\lightsource{ \pstVerb{\pst@solides@viewpoint /PhI exch def /ThetA exch def /Dist exch def /Lx Dist ThetA cos mul PhI cos mul def /Ly Dist ThetA sin mul PhI cos mul def /Lz Dist PhI sin mul def}% \psset{lightsrc=Lx Ly Lz} } \makeatother \begin{document} \pagestyle {empty} \begin{center} \begin{pspicture}(-4,-4)(4,4) \psset{viewpoint=100 30 20,Decran=100} \pstVerb{/radius 4 def /edge_cube radius 4 mul 3 div def /axes edge_cube 2 div def}% \lightsource \psSolid[object=octahedron, a=radius , trunc=all, hue=.5 .6, trunccoeff=.3333, action=draw*] \psSolid[object=octahedron, a=radius,linecolor=gray, action=draw] \psSolid[object=cube,linecolor=red, a=edge_cube, action=draw] \axesIIID(axes,axes,axes)(5,5,5) \end{pspicture} \end{center} \end{document}