<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks to both Jean-Paul and Florian; both solutions work.<div>I am still, however, puzzled as to why mine doesn't---but no big deal.<br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; "><br class="Apple-interchange-newline">Zbigniew Nitecki</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Department of Mathematics</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Tufts University</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Medford, MA 02155</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><br></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">telephones:</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Office<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3843</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept.<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3234</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Helvetica" size="3" style="font: normal normal normal 12px/normal Helvetica; ">Dept. fax<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3966</font></p><a href="http://www.tufts.edu/~znitecki/">http://www.tufts.edu/~znitecki/</a></span>
</div><div><br></div><div>On Jul 23, 2010, at 15:20, Jean-Paul Vignault wrote:<br><br>> Everything works well, except the normal vector. When I try to use<br>> the predefined pst3d-solides object vecteur, I get the appropriate<br>> vector, but the arrowhead on it is awful (is there a way to control<br>> arrowheads in this setting?)<br><br><a href="http://melusine.eu.org/lab/bpst/pst-solides3d/vecteur">http://melusine.eu.org/lab/bpst/pst-solides3d/vecteur</a><br><br>Jean-Paul Vignault<br><br></div>
<br><div><div>On Jul 23, 2010, at 13:49, Florian Schubert wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div bgcolor="#ffffff" text="#000000">
Isn`t it possible to define two points and connecting it with a line:<br>
<br>
\pspoint(<x0>,<y0>,<z0>){A1}<br>
\pspoint(<x1>,<y1>,<z1>){A2}<br>
\psline[<param>]{<arrows>}(A1)(A2)<br>
<br>
<div><span class="Apple-tab-span" style="white-space: pre;"></span><font class="Apple-style-span">\vecThree[linecolor=red,
arrows=->] {0.612}{-0.612}{0.5}{1.142}{-1.142}{0.933}:<br>
</font><br>
\psPoint<font class="Apple-style-span">
(0.612,-0.612,0.5)</font>{A1}<br>
\psPoint(<font class="Apple-style-span">1.142,-1.142,0.933</font>){A2}<br>
\psline[linecolor=red,arrowsize=.5pt]{->}(A1)(A2)<br>
<br>
</div>
See "pst-solides3d: The Documentation – The Basics v. 4.10
(2008/07/24)"<br>
CHAPTER 10 Interaction with PSTricks<br>
<br>
Florian<br>
<br>
Am 23.07.2010 18:26, schrieb Zbigniew Nitecki:
<blockquote cite="mid:2B4C17FE-CBE9-4467-8742-EC9D7EF20A73@tufts.edu" type="cite">The code shown below is intended to draw a sphere, a point
on the sphere, the plane tangent to the sphere there, and the normal
vector there.
<div><br>
</div>
<div>Everything works well, except the normal vector. When I try to
use the predefined pst3d-solides object vecteur, I get the appropriate
vector, but</div>
<div>the arrowhead on it is awful (is there a way to control
arrowheads in this setting?)</div>
<div>So I tried a pst-3dplot macro(defined just before
\begin{document} which has worked in the past;</div>
<div>it is called in the last uncommented line before
\end{pspicture}. When this call is commented out, the code compiles
fine (of course,</div>
<div>with no vector shown), but when it is not commented out, the
error message is</div>
<div>
<blockquote type="cite">
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Error:
/typecheck in --show--</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Operand
stack:</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
--nostringval--</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Execution
stack:</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
%interp_exit .runexec2 --nostringval-- --nostringval--
--nostringval-- 2 %stopped_push --nostringval-- --nostringval--
--nostringval-- false 1 %stopped_push 1862 1 3
%oparray_pop 1861 1 3 %oparray_pop 1845 1 3
%oparray_pop 1739 1 3 %oparray_pop --nostringval--
%errorexec_pop .runexec2 --nostringval-- --nostringval--
--nostringval-- 2 %stopped_push --nostringval-- --nostringval--</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Dictionary
stack:</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
--dict:1150/1684(ro)(G)-- --dict:0/20(G)-- --dict:80/200(L)--
--dict:771/1012(L)-- --dict:180/300(L)-- --dict:38/200(L)--
--dict:186/200(L)--</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Current
allocation mode is local</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Last
OS error: 2</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">Current
file position is 551632</div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">GPL
Ghostscript 8.70: Unrecoverable error, exit code 1</div>
</blockquote>
</div>
<div>
<div style="margin: 0px; font-family: Monaco; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;"><br>
</div>
</div>
<div>Where is the conflict causing this problem? Does anyone have a
workaround?</div>
<div><br>
</div>
<div><br>
</div>
<div>
<blockquote type="cite">
<div><font class="Apple-style-span">% !TEX
TS-program = latex</font></div>
<div><font class="Apple-style-span">\listfiles</font></div>
<div><font class="Apple-style-span">\documentclass[11pt]{article}</font></div>
<div><font class="Apple-style-span">\usepackage{pst-solides3d,
pst-3dplot, pst-math,pstricks-add}</font></div>
<div><font class="Apple-style-span">\usepackage{pst-3d}</font></div>
<div><font class="Apple-style-span">%\usepackage{graphicsmacros}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\newcommand{\vecThree}[6]{\pstThreeDLine[arrows=->]%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">(#1\space,#2\space,#3\space)(#4\space,#5\space,#6\space)</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">%arrow from (#1,#2,#3) to
(#4,#5,#6)</font></div>
<div><font class="Apple-style-span"><br>
</font></div>
<div><font class="Apple-style-span">\begin{document}</font></div>
<div><font class="Apple-style-span">a little text
before, going on and on and on and on....</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\begin{figure}[htbp]</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\begin{center}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\begin{pspicture}(-3,-3.5)(3,3)</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psset{unit=0.75}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psset{lightsrc=50 -20 40,
viewpoint=20 20 50 rtp2xyz,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">Decran=50}</font></div>
<div><font class="Apple-style-span"><br>
</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\axesIIID[linecolor=red](1,1,1)(2,2,2)</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span></div>
<div><font class="Apple-style-span">%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psSolid[</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">object=sphere,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">r=1,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">ngrid=20 20,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">fillcolor=lightgray,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">grid,</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">]</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psPoint(0.612,-0.612,0.5){P}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psPolygonIIID[linestyle=none,fillstyle=solid,fillcolor=red!20,
opacity=0.1]%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">(0.259,-0.29,1.366)%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">(0,-1.224,0.5)%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">(0.965,-0.965,-0.366)%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">(1.224,0,0.5)%</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psdots[dotstyle=o,
dotsize=0.2,fillcolor=red](P)</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\psSolid[</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">object=vecteur,</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">linecolor=red,</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">args=0.53 -0.53 0.433]
(0.612,-0.612,0.5)</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">]</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\vecThree[linecolor=red,
arrows=->] {0.612}{-0.612}{0.5}{1.142}{-1.142}{0.933}</font></div>
<div><font class="Apple-style-span">%</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\pstThreeDPut(1,0.5,0.3){\textcolor{red}{$(1,\half,\recip{8})$}}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\end{pspicture}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span></div>
<div><font class="Apple-style-span"><br>
</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\caption{Tangent Plane to
Sphere at
$\left(\frac{\sqrt{3}}{2\sqrt{2}},-\frac{\sqrt{3}}{2\sqrt{2}},\frac{1}{2}\right)$}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\label{fig:spheretan}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\end{center}</font></div>
<div><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span><font class="Apple-style-span">\end{figure}</font><span class="Apple-tab-span" style="white-space: pre;"><font class="Apple-style-span"> </font></span></div>
<div><font class="Apple-style-span"><br>
</font></div>
<div><font class="Apple-style-span">a little text
after</font></div>
<div><font class="Apple-style-span">\end{document}</font></div>
</blockquote>
<div><br>
</div>
Picture when line "vecThree[linecolor=red..." is commented out:</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<div><br>
<div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica"><br class="Apple-interchange-newline">
Zbigniew Nitecki</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Department of Mathematics</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Tufts University</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Medford, MA 02155</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal; min-height: 14px; font-size: 12px; "><br>
</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">telephones:</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Office<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3843</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Dept.<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3234</font></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-size: 12px; "><font style="font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; font-size: 12px; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;" size="3" face="Helvetica">Dept. fax<span class="Apple-converted-space"><span class="Apple-converted-tab"> <span class="Apple-converted-space"> </span></span></span>(617)627-3966</font></div>
</div>
<br>
</div>
<pre wrap=""><fieldset class="mimeAttachmentHeader"></fieldset>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Florian Schubert
Pestalozzistraße 47
D-79540 Lörrach
47° 35' 50'' nördliche Breite, 7° 39' 35'' östliche Länge
</pre>
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