[pstricks] x/x in pstricks

[mathias legrand]

Hi all,

please have a look at the code below. What are existing strategies to 
avoid the inconsistency? postscript does not know what to do with 
(x+y)/(x+y) in (x,y)=(0,0). Thank you

\documentclass{article}
\usepackage{pst-solides3d}
\pagestyle{empty}
\begin{document}

\begin{pspicture}(-4,-5)(6,8)
\psset{lightsrc=40 25 140,viewpoint=50 -45 30 rtp2xyz,Decran=60,unit=0.5}
% will compile
\psSurface[ngrid=.7 
.7,incolor=yellow,linewidth=0.1\pslinewidth,fillcolor=red!15,Zmin=-8,Zmax=8](-4.1,-4)(4,4){y 
x add x y add div}
% won't compile
\psSurface[ngrid=.7 
.7,incolor=yellow,linewidth=0.1\pslinewidth,fillcolor=red!15,Zmin=-8,Zmax=8](-4,-4)(4,4){y 
x add x y add div}
\end{pspicture}

\end{document}