\documentclass{article}

\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
%\tracingmacros=2 \tracingcommands=2
\begin{axis}
	\addplot3[samples=3,surf,shader=faceted interp] {x*y};
\end{axis}
\end{tikzpicture}
\end{document}
