anim.tex

\documentclass{article}
\usepackage[dvipsnames,svgnames]{pstricks}
\usepackage{pst-solides3d,pstricks-add}
\pagestyle{empty}
\begin{document}
\begin{center}
\psset{unit=0.5}
\psset{lightsrc=30 -10 10,linewidth=0.5\pslinewidth}
\multido{\r=1+1}{75}{
\psset{SphericalCoor,viewpoint=30 50 \r\space,Decran=50}
\begin{pspicture}(-5,-6)(5,10)
\psSurface[
   fillcolor=cyan!50,algebraic,
   ngrid=.25 .25,incolor=yellow,hue,
   Zmin=-3,Zmax=3](-3,-3)(3,3){%
   x*y*(x^2-y^2)*0.2}
\end{pspicture}
\newpage
}
\end{center}
\end{document}