%% 
%%  A DANTE-Edition example
%% 
%%  Example 34-01-4 on page 741.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks-add}

\begin{document}
\psset{unit=0.5}
\begin{pspicture}(0,-1)(10,10)
 \psGTriangle(0,0)(9,10)(10,3)%
   {black!10}{black!50}{black!85}
 \psGTriangle(0,0)(3,7)(9,10)%
   {black!10}{black!65}{black!50}
 \pspolygon(0,0)(3,7)(9,10)(10,3)
\end{pspicture}
\end{document}