Plotting RBF function

generate_image.sh

TEX_FILENAME="rbf"
latex ${TEX_FILENAME}.tex;
dvips ${TEX_FILENAME}.dvi -E -o ${TEX_FILENAME}.eps
convert -density 300 ${TEX_FILENAME}.eps ${TEX_FILENAME}.png

rbf.tex

\documentclass[letterpaper,dvips]{article}
\usepackage{pst-all}
\usepackage{pst-3dplot}
\usepackage{pst-eps}
\usepackage{pst-solides3d}

\begin{document}
  \pagestyle{empty}
  \psset{unit=0.35}

  \begin{TeXtoEPS}
    \psset{lightsrc=30 -10 10}
    \psset{viewpoint=50 20 30 rtp2xyz,Decran=70}
    \begin{pspicture}(-11,-8)(7,8)
    \psSurface[ngrid=.2 .2,algebraic,Zmin=-1,Zmax=1,
              linewidth=0.5\pslinewidth,spotX=r,spotY=d,
                  spotZ=l,
    hue=0 1](-5,-5)(5,5){
e^(-((x - 3)^2 + (y - 2)^2) * 2.0) + e^(-((x - 1)^2 + (y - 1)^2) * 2.0) + e^(-((x - -1)^2 + (y - 0)^2) * 2.0) + e^(-((x - 2)^2 + (y - -2)^2) * 2.0)
    }
    \end{pspicture}
  \end{TeXtoEPS}
\end{document}