import solids;
size(6cm,0);

currentprojection=orthographic(100,100,30);
real r=1;

skeleton s;
revolution sph=sphere(O,r);
sph.filldraw(palegray);

triple cam=currentprojection.camera;
revolution cle=revolution(O,r*(rotate(90,Z)*cam),cam);
cle.draw(bp+red);