\documentclass{article}

\usepackage{tikz}

%--------------------------------------------------
%: math3d
\tikzset{math3d/.style={x={(-0.353cm,-0.353cm)},z={(0cm,1cm)},y={(1cm,0cm)}}}

%--------------------------------------------------
\begin{document}

\begin{tikzpicture}[math3d,fill=gray!20]
  \foreach \t in {0,0.1,...,1} 
     \filldraw plot[samples=50,domain=0:2*pi]
          ({cos(\x r)}, {sin(\x r)}, \t);
\end{tikzpicture}

\end{document}
