Dear Hans, Aditya,

Now, I understand the stacking method.
I made a simple animation using it.


\startuseMPgraphic{demo}
for i=1 upto 10:
draw fullcircle scaled (.3*i*cm) withcolor (.1*i*red) withpen pencircle scaled (.5*bp) withstacking i;
endfor;
\stopuseMPgraphic
\setupinteraction[state=start]
\usemodule[animation]

\starttext
\startanimation[menu=yes]
% \dorecurse{10}
% { {\useMPgraphic[stacking={#1}]{demo}}}
{\useMPgraphic[stacking={1}]{demo}}
{\useMPgraphic[stacking={2}]{demo}}
{\useMPgraphic[stacking={3}]{demo}}
{\useMPgraphic[stacking={4}]{demo}}
{\useMPgraphic[stacking={5}]{demo}}
{\useMPgraphic[stacking={6}]{demo}}
{\useMPgraphic[stacking={7}]{demo}}
{\useMPgraphic[stacking={8}]{demo}}
{\useMPgraphic[stacking={9}]{demo}}
{\useMPgraphic[stacking={10}]{demo}}
\stopanimation
\stoptext


However, I cannot succeed to use \dorecurse to make the code simple.
If there is another good method, please let me know.

Anyway, thanks for this new feature!

Best regards,
Dalyoung