%mathmuse.sci.ibaraki.ac.jp/geom/param9E.html

input mp-solid

%1''
figureespace(-10u,-10u,10u,10u);
Initialisation(2000,-40,40,90);
incolor=0.5[bleu,white];
outcolor=0.5[orange,white];
draw Sparam("(v*sin(u),v*cos(u),u/3)",0,10.2,0.25,-1,1,0.1);
finespace;
end