# Example: Stacked discs in 3d

Published 2014-07-29 | Author: Mark Wibrow

To draw a stack of disks with a 3d impression, we use the pic element, which is new in TikZ 3.0 and can be considered like combining a node and a tikzpicture.

This example was written by Mark Wibrow answering a question on TeX.SE.

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% Stacked disks
% Author: Mark Wibrow
\documentclass[tikz,border=10pt]{standalone}
\tikzset{
pics/.cd,
disc/.style = {
code = {
\fill [white] ellipse [x radius = 2, y radius = 2/3];
\path [left color = black!50, right color = black!50,
middle color = black!25]
(-2+.05,-1.1) arc (180:360:2-.05 and 2/3-.05*2/3) -- cycle;
\path [top color = black!25, bottom color = white]
(0,.05*2/3) ellipse [x radius = 2-.05, y radius = 2/3-.05*2/3];
\path [left color = black!25, right color = black!25,
middle color = white] (-2,0) -- (-2,-1) arc (180:360:2 and 2/3)
-- (2,0) arc (360:180:2 and 2/3);
\foreach \r in {225,315}
\foreach \i [evaluate = {\s=30;}] in {0,2,...,30}
\fill [black, fill opacity = 1/50]
(0,0) -- (\r+\s-\i:2 and 2/3) -- ++(0,-1)
arc (\r+\s-\i:\r-\s+\i:2 and 2/3) -- ++(0,1) -- cycle;
\foreach \r in {45,135}
\foreach \i [evaluate = {\s=30;}] in {0,2,...,30}
\fill [black, fill opacity = 1/50]
(0,0) -- (\r+\s-\i:2 and 2/3)
arc (\r+\s-\i:\r-\s+\i:2 and 2/3)  -- cycle;
}
},
disc bottom/.style = {
code = {
\foreach \i in {0,2,...,30}
\fill [black, fill opacity = 1/60] (0,-1.1)
ellipse [x radius = 2+\i/40, y radius = 2/3+\i/60];
\path pic {disc};
}
}
}
\begin{document}
\begin{tikzpicture}
\path (0,0) pic {disc bottom} (0,1.25) pic {disc} (0,2.5) pic {disc};
\end{tikzpicture}
\end{document} 