[pstricks] Odd (?) behavior of \ThreeDput

[Zbigniew Nitecki]

 From Section 28.31 of Voss's book (3rd ed.), I expect the following
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	\begin{pspicture}(-2.5,-2.0)(2.5,3.5)
	\psset{xunit=2cm, yunit=2cm}
		
		\pstThreeDSquare[fillstyle=solid, fillcolor=lightgray](0,0.5,0) 
(1,0,0)(0,0,1)
		
		\ThreeDput[normal=0 1 0]{
			\rput(0.2,-0.2){$\vec{x_{0}}$}
			\rput(0.25,0.45){$R$}
		}
		
	\end{pspicture}
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  *File List*
  article.cls    2005/09/16 v1.4f Standard LaTeX document class
   size11.clo    2005/09/16 v1.4f Standard LaTeX file (size option)
pstricks.sty    2008/01/24 v0.37 LaTeX wrapper for `PSTricks' (RN,HV)
pstricks.tex    2008/02/01 v1.21 `PSTricks' (tvz)
   xcolor.sty    2005/12/21 v2.09 LaTeX color extensions (UK)
    color.cfg    2007/01/18 v1.5 color configuration of teTeX/TeXLive
    dvips.def    1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)
pst-3dplot.sty    2006/02/07 package wrapper for pst-3dplot.tex (hv)
pst-3dplot.tex    2008/02/08 v1.80 `PST-3dplot' (hv)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
  xkeyval.sty    2005/11/25 v2.5e package option processing (HA)
  xkeyval.tex    2005/11/25 v2.5e key=value parser (HA)
   
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to print the labels on the square.  However, I get

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On the other hand, changing the normal from 0 1 0 to 1 0 0 gives me  
the correct placement.

What is going on?  Shouldn't "normal=" specify the normal to the plane  
containing the text?

Related question:  It seemed to me that if I changed viewpoint (eg,  
Alpha=30) without changing the normal, then again the plane of the  
label was off:  it looked as if this is in some absolute coordinate  
system which does not change with viewpoint.  Comment?


Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

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