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\documentclass[a4paper]{article}
\usepackage{pst-solides3d}
 
\begin{document}
\pagestyle {empty}
\begin{pspicture}(-4,-4.5)(4,4.5)
\psset{viewpoint=50 20 30 rtp2xyz,lightsrc=viewpoint}
\psset{solidmemory}
\psset[pst-solides3d]{color1=red!60}
\psset[pst-solides3d]{color2=red!20}
\psSurface[ngrid=.25 .25,inouthue=1 0 0.5 1,
    linewidth=0.5\pslinewidth,axesboxed,
    tablez=-.5 .5,
    zcolor=(Red) (Yellow),
    algebraic](-4,-4)(4,4){%
    ((y^2)-(x^2))/4 }
\end{pspicture}
\end{document}