documentclass{standalone}
usepackage{pgfplots}
pgfplotsset{compat=1.4}
usepackage{tikz-3dplot}
tdplotsetmaincoords{60}{-30}
tdplotsetrotatedcoords{0}{90}{90}%
begin{document}
begin{tikzpicture}
  [tdplot_rotated_coords,
    scale=3,
    mdc/.style={fill=blue, color=blue,draw=none, opacity=.4,line join=round},
    length/.style={<->,thick,line cap=round}]
  defd{1}
  defr{d*.45}

    % Cylinder
  foreach t in {0,12,...,348}
    draw[mdc] ({cos(t   )*r+d/2},  0, {sin(t   )*r+d/2}) % side vertice of cylinder
            -- ({cos(t+12)*r+d/2},  0, {sin(t+12)*r+d/2})
            -- ({cos(t+12)*r+d/2}, d, {sin(t+12)*r+d/2})
            -- ({cos(t   )*r+d/2}, d, {sin(t   )*r+d/2})
            -- cycle;
end{tikzpicture}
end{document}