\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=10 3 3,Decran=80} \psset{solidmemory} \psSolid[object=octahedron, a=1, %% radius of sphere wich contains octahedron fillcolor=orange, name=my_tetrahedron, action=none] \psSolid[object=calottesphere, r=1, %% radius of sphere phi=-90, theta=0, ngrid=18 36, name=my_sphere, incolor=cyan, hue=.4 .5, hollow, action=none] \psSolid[object=fusion, base=my_sphere my_tetrahedron ] \composeSolid \end{pspicture} \end{center} \end{document}