以下是我目前所掌握的信息:
\documentclass{amsart}
\usepackage{pst-solides3d}
\begin{document}
\psset{Decran=20,viewpoint=40 20 20 rtp2xyz,lightsrc=viewpoint,action=draw**,
fillcolor=blue!30!white,linewidth=0.1pt}
\psset{incolor=red!60!white}
\begin{pspicture}(-1.5,-1)(1.5,3)
\psSolid[object=sphere,r=3,ngrid=20 20,hollow](0,0,2)
\end{pspicture}
\end{document}
我想从网格中删除所有水平线,只留下垂直线。例如: