function special_plot(sTh,u)
  assert( fc_simesh.is_siMeshElt(sTh) & sTh.d==1 )
  Q=[[sTh.q;zeros(1,sTh.nq)],[sTh.q;u']]';
  metmp=(sTh.me+sTh.nq)';
  ME=[sTh.me',metmp(:,2),metmp(:,1)];
  patch('vertices',Q,'Faces',ME,'FaceColor',0.9*[1,1,1],'EdgeColor',0.8*[1,1,1])
end
