\pdfcompresslevel=0
\documentclass{article}

\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
	\begin{axis}[view={0}{90}]
	\addplot3[surf,shader=interp,domain=0:1,samples=25] {(1-x)*(1-y) + x*y};
	\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
	\begin{axis}[view={0}{90}]
	\addplot3[surf,shader=interp,samples=2] {x*y};
	\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
	\begin{axis}
		
	\addplot[patch,shader=interp,point meta=\thisrow{c}] table {
		x y c
		0 0 0
		1 0 0 
		3 2 2
		%
		0 1.5  1.5
		1 1.5  1.5
		0.5 2  2
		%
		2.5 0     1
		3 	0.25  2
		2 0.5     3
	}; 
	\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
	\begin{axis}
	\addplot3[patch,shader=interp] file {FokkerDrI_layer_0.patches.dat};
	\end{axis}
\end{tikzpicture}

\clearpage
la
\end{document}

