\documentclass[12pt]{article}
\usepackage{pstricks}
\usepackage{pst-vue3d}
\SpecialCoor
\makeatletter
%
\makeatother
\begin{document}

\psset{unit=3}
\begin{pspicture}(-1.5,-0.75)(2.5,2.25)
	\AxesThreeD(20)
 	\pNodeThreeD(15,18,15){P}% cartesian
	\uput[0](P){P}
	\psset{linecolor=red}
	\qdisk(P){3pt}
	\showCoorThreeD[linecolor=red](15,18,15)
	\psset{linecolor=blue}
	\pNodeThreeD(20;60;40){Q}% spherical
	\uput[0](Q){Q}
	\qdisk(Q){3pt}
	\showCoorThreeD[linecolor=blue](20;60;40)
\end{pspicture}

\end{document}
