my_model(x[3], a[1])
{
array center[3];
center = [0,0,0];

co1=hfEllConeX(x,center,0.5,0.5);
co2=hfEllConeY(x,center,0.7,0.2); 
co3=hfEllConeZ(x,center,0.2,0.8);

my_model = co1 | co2 | co3;
}