Principal stress arrow versus cone

Hi,

I'm trying to plot my principal stresses (sigma 1 and sigma 3) as cones instead of arrows (which do not look nice for geological purpose).

The black cones on comsol3.5 were pointing inward for sigma1 and outward for sigma 3 (see cones.jpg).

So, in the documentation (there is plenty of them and I'm not sure which one is right), I found that:

model.result('pg1').feature.create('pris1', 'PrincipalSurface');
model.result('pg1').feature('pris1').feature.create('def1', 'Deform');

model.result('pg1').feature('pris1').set('xnumber', '250');
model.result('pg1').feature('pris1').set('ynumber', '10');
%model.result('pg1').feature('pris1').set('arrowtype', 'cone');
model.result('pg1').feature('pris1').feature.create('def1', 'Deform');
model.result('pg1').feature('pris1').set('princvalstressexpr', {'solid.sp1' '0' 'solid.sp3'});

The result is that the arrows are still arrows not cones (see untiled.jpg) (I had an error message for the color parameter).

Can anyone help me?

Thank you

Nicolas