[pstricks] pst-solides3d problem

[Orlando Camargo Rodríguez]

Hi 3D TeX gurus.

I'm playing with the pst-solides3d package, trying to generate sone
surfaces. This is the code I borrowed from the documentation: 

\documentclass[12pt]{article}

\listfiles

\usepackage{pstricks}
\usepackage{pst-solides3d}

\pagestyle{empty}

\begin{document}

\psset{unit=0.45}
\begin{pspicture}(-7,-8)(7,8)
\psSurface[incolor=yellow,linewidth=0.5
\pslinewidth,axesboxed,algebraic,hue=0 1](-4,-4)(4,4){%
((y^2)-(x^2))/4 }
\end{pspicture}

\end{document}

So, it LaTeX's fine, it dvip's fine, it pdftops's fine but I get the
saddle surface in spherical coordinates rather than in cartesian
coordinates (?) 

I'm attaching the figure.

Thanks in advance 

Best regards 

Tordar  
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