import solids;

size(5cm);

currentprojection=orthographic(10,5,2);
currentlight=Headlamp;

nslice=4*nslice;
revolution b=sphere(O,1);
draw(surface(b),palegreen+opacity(.5));

skeleton s;

b.transverse(s,reltime(b.g,0.2),P=currentprojection);
b.transverse(s,reltime(b.g,0.5),P=currentprojection);
draw(s.transverse.back,linetype("8 4",8));
draw(s.transverse.front,red);