my_model(x[3], a[1])
{
array center[3];
center = [6,6,0];
el1=hfEllCylX(x,center,2,4);

center[2]=-6;
el2=hfEllCylY(x,center,3,2); 

center[1]=-6;
el3=hfEllCylZ(x,center,4,1);

my_model = el1 | el2 | el3;
}