% Р”РµРјРѕРЅСЃС‚СЂР°С†РёСЏ С„СѓРЅРєС†РёРё isosurface
a=3; h= 0.05;
[x,y,z] = meshgrid(-a:h:a,-a:h:a,-a:h:a);
%v= (x).^2/2+y.^2/1.5-(z).^2;
v= (x)-y.^2/1.5;
isosurface(x,y,z,v,1);
axis equal
