size(6cm,0);
import solids;

currentprojection=orthographic(10,5,0);
currentlight=Headlamp; // Headlamp est la valeur par défaut

nslice=4*nslice;
revolution boule=sphere(O,1);
draw(surface(boule),lightgrey+yellow+opacity(.5));

skeleton s;

for(real i=0; i>-1; i-=.2){
boule.transverse(s,reltime(boule.g,acos(i)/pi),P=currentprojection);
draw(s.transverse.back,linetype("10 10",10));
draw(s.transverse.front);
}