[pstricks] arrows and arrowheads in pst3d-solides

[Zbigniew Nitecki]

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.

Everything works well, except the normal vector.  When I try to use the predefined pst3d-solides object vecteur, I get the appropriate vector, but
the arrowhead on it is awful (is there a way to control arrowheads in this setting?)
So I tried a pst-3dplot macro(defined just before \begin{document} which has worked in the past;
it is called in the last uncommented line before \end{pspicture}.  When this call is commented out, the code compiles fine (of course,
with no vector shown), but when it is not commented out, the error message is
> Error: /typecheck in --show--
> Operand stack:
>    --nostringval--
> Execution stack:
>    %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--
> Dictionary stack:
>    --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)--
> Current allocation mode is local
> Last OS error: 2
> Current file position is 551632
> GPL Ghostscript 8.70: Unrecoverable error, exit code 1


Where is the conflict causing this problem?  Does anyone have a workaround?


> % !TEX TS-program = latex
> \listfiles
> \documentclass[11pt]{article}
> \usepackage{pst-solides3d, pst-3dplot, pst-math,pstricks-add}
> \usepackage{pst-3d}
> %\usepackage{graphicsmacros}
> 	\newcommand{\vecThree}[6]{\pstThreeDLine[arrows=->]%
> 		(#1\space,#2\space,#3\space)(#4\space,#5\space,#6\space)
> 	}
> 		%arrow from (#1,#2,#3) to (#4,#5,#6)
> 
> \begin{document}
> a little text before, going on and on and on and on....
> 	\begin{figure}[htbp]
> 	\begin{center}
> 		\begin{pspicture}(-3,-3.5)(3,3)
> 				\psset{unit=0.75}
> 				\psset{lightsrc=50 -20 40, viewpoint=20 20 50 rtp2xyz,
> 					Decran=50}
> 
> 				\axesIIID[linecolor=red](1,1,1)(2,2,2)				
> 				
> %
> 				\psSolid[
> 					object=sphere,
> 					r=1,
> 					ngrid=20 20,
> 					fillcolor=lightgray,
> 					grid,
> 					]
> 			\psPoint(0.612,-0.612,0.5){P}
> 			\psPolygonIIID[linestyle=none,fillstyle=solid,fillcolor=red!20, opacity=0.1]%
> 				(0.259,-0.29,1.366)%
> 				(0,-1.224,0.5)%
> 				(0.965,-0.965,-0.366)%
> 				(1.224,0,0.5)%
> 			\psdots[dotstyle=o, dotsize=0.2,fillcolor=red](P)
> %			\psSolid[
> %				object=vecteur,
> %				linecolor=red,
> %				args=0.53 -0.53 0.433] (0.612,-0.612,0.5)
> %				]
> 			\vecThree[linecolor=red, arrows=->] {0.612}{-0.612}{0.5}{1.142}{-1.142}{0.933}
> %			\pstThreeDPut(1,0.5,0.3){\textcolor{red}{$(1,\half,\recip{8})$}}
> 				
> 		\end{pspicture}
> 			
> 
> 	\caption{Tangent Plane to Sphere at $\left(\frac{\sqrt{3}}{2\sqrt{2}},-\frac{\sqrt{3}}{2\sqrt{2}},\frac{1}{2}\right)$}
> 	\label{fig:spheretan}
> 	\end{center}
> 	\end{figure}		
> 
> a little text after
> \end{document}

Picture when line "vecThree[linecolor=red..." is commented out:


Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966

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