<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%% 
%%  A DANTE-Edition example
%% 
%%  Example 00-00-1 on page xii.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}


\usepackage[svgnames,dvipsnames]{pstricks}
\usepackage{pst-3dplot}
\def\radius{4 }\def\PhiI{20 }\def\PhiII{50 }
\def\RadIs{\radius \PhiI sin mul}
\def\RadIc{\radius \PhiI cos mul}
\def\RadIIs{\radius \PhiII sin mul}
\def\RadIIc{\radius \PhiII cos mul}

\begin{document}

\begin{pspicture}(-4,-4)(4,5)
  \psset{Alpha=45,Beta=30,linestyle=dashed}
  \pstThreeDCoor[linestyle=solid,xMin=-5,xMax=5,yMax=5,zMax=5,IIIDticks,IIIDlabels]
  \pstThreeDEllipse[linecolor=red](0,0,0)(0,\radius,0)(0,0,\radius)
  \pstThreeDEllipse(\RadIs,0,0)(0,\RadIc,0)(0,0,\RadIc)
  \pstThreeDEllipse(\RadIIs,0,0)(0,\RadIIc,0)(0,0,\RadIIc)
%
  \pstThreeDEllipse[linestyle=dotted,SphericalCoor](0,0,0)(\radius,90,\PhiI)(\radius,0,0)
  \pstThreeDEllipse[SphericalCoor,
	beginAngle=-90,endAngle=90](0,0,0)(\radius,90,\PhiI)(\radius,0,0)
  \pstThreeDEllipse[linestyle=dotted,SphericalCoor](0,0,0)(\radius,90,\PhiII)(\radius,0,0)
  \pstThreeDEllipse[SphericalCoor,
	beginAngle=-90,endAngle=90](0,0,0)(\radius,90,\PhiII)(\radius,0,0)
%
  \pscustom[fillstyle=solid,fillcolor=blue]{
    \pstThreeDEllipse[SphericalCoor,beginAngle=\PhiI,endAngle=\PhiII]%
	(0,0,0)(\radius,90,\PhiII)(\radius,0,0)
    \pstThreeDEllipse[beginAngle=\PhiII,endAngle=\PhiI](\RadIIs,0,0)(0,\RadIIc,0)(0,0,\RadIIc)
    \pstThreeDEllipse[SphericalCoor,beginAngle=\PhiII,endAngle=\PhiI]%
	(0,0,0)(\radius,90,\PhiI)(\radius,0,0)
    \pstThreeDEllipse[beginAngle=\PhiI,endAngle=\PhiII](\RadIs,0,0)(0,\RadIc,0)(0,0,\RadIc)
  }
\end{pspicture}

\psset{unit=0.45cm,plotpoints=2000,linejoin=1,coorType=2}
\begin{pspicture}(-7.5,-6.5)(14,14)
%
\pstThreeDCoor[xMax=11,yMax=13,zMax=11,
  nameX=$x_1$,nameY=$x_2$,nameZ=$x_3$,
  IIIDticks,IIIDlabels,IIIDticksize=0.2,linewidth=.75pt,linecolor=Black,
  IIIDxticksep=-.8,IIIDyticksep=-.5,IIIDzticksep=-.9,
  drawing,Alpha=90,IIIDxTicksPlane=yz]
%
\pstThreeDNode(0,0,0){A}
\pstThreeDNode(8,0,0){B}
\pstThreeDNode(8,8,0){C}
\pstThreeDNode(0,8,0){D}
\pstThreeDNode(4,4,12){S}
\pstThreeDNode(4,4,0){F}
%
\pstThreeDNode(10,0, 14 5 div){X}
\pstThreeDNode(10,7,0){XY}
\pstThreeDNode(0,12,0){Y}
\pstThreeDNode(0,0,24 5 div){Z}
%
\pspolygon[linecolor=Blue,fillstyle=solid,fillcolor=gray,
    opacity=0.5](A)(B)(C)(D)
\pspolygon[linecolor=DarkGreen, linewidth=1pt,
    fillstyle=solid,fillcolor=Orange,opacity=0.5](X)(XY)(Y)(Z)
\psline[linewidth=1pt](A)(S)
\psline[linewidth=1pt](B)(S)
\psline[linewidth=1pt](C)(S)
\psline[linewidth=1pt](D)(S)
%
\parametricplotThreeD[linecolor=DarkGreen,linestyle=dashed](.4,.5833333333){-24 t mul 24 add 0 24 5 div t mul}
\parametricplotThreeD[linecolor=DarkGreen,linestyle=dashed](.45,.5833333333){-24 t mul 24 add 12 t mul 0}

\psset{linewidth=1.75pt}
\pstThreeDNode(4 3 div , 4 3 div, 4){SA}
\pstThreeDNode(7,1,3){SB}
\pstThreeDNode(8,8,0){SC}
\pstThreeDNode(4 7 div , 52 7 div , 12 7 div){SD}
\pspolygon(SA)(SB)(SC)(SD)

\end{pspicture}
\end{document}
</pre></body></html>