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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">Thank you so much!</font></div>
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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">And finally, how can I suppress drawing the three points? (I tried show=none, but that doesn't work)</font></div>
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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;">Poul Riis</font></div>
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<div align="left" style="text-align:left;"><font face="Arial" size="+0" color="#000000" style="font-family:Arial;font-size:10pt;color:#000000;"><b>Graphics with PSTricks <<a href="mailto:pstricks@tug.org">pstricks@tug.org</a>> writes:</b></font></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\documentclass{article}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\usepackage[x11names]{xcolor}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\usepackage{pst-solides3d}</font></span></div>
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<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\begin{document}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psset{unit=5mm}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\begin{pspicture}[solidmemory](-10,-15)(10,15)</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\pstVerb{/aa 6 def /bb 10 def /cc 4 def /philaag 20 def /cosphi philaag </font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">cos def /sinphi philaag</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> sin def /Mlaagx cosphi 1 sub aa mul 2 div def /Mlaagz sinphi aa mul 2 </font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">div cc add def /nlaagx</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> sinphi neg def /nlaagz cosphi def /radius 1 def /Ax Mlaagx def /Ay </font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">radius def /Az Mlaagz def</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> /Bx Mlaagx radius cosphi mul add def /By 0 def /Bz Mlaagz radius sinphi </font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">mul add def /Cx Mlaagx</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> def /Cy radius neg def /Cz Mlaagz def}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psset{viewpoint=100 30 20,Decran=200}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psSolid[</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> object=parallelepiped,%</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> a=aa,b=bb,c=cc,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> hollow,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> fillcolor=Green3,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> affinage=0,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> affinagecoeff=1,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> incolor=yellow](0,0,cc 2 div)</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psSolid[object=plan,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> definition=normalpoint,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> args={ Mlaagx 0 Mlaagz [sinphi 0 cosphi neg]},</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> fillcolor=Gold3,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> base=aa neg 2 div aa 2 div bb neg 2 div bb 2 div,showbase,</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;"> name=myplane]</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psset{plan=myplane}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psProjection[object=point,args=Ax Ay,name=A]</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psProjection[object=point,args=Bx By,name=B]</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psProjection[object=point,args=Cx Cy,name=C]</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\psProjection[object=cercle,definition=ABcercle,args=A B C,range=0 360]</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\end{pspicture}</font></span></div>
<div align="left" style="text-align:left;"><span style="background-color:#d0d0d0;"><font face="Geneva" size="+0" color="#000000" style="font-family:Geneva;font-size:10pt;color:#000000;">\end{document}</font></span></div>
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