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How can I get curvature contour

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Teerapong Poltue
Teerapong Poltue on 4 Nov 2020
I got my surface plot from
Schwarz = @(x,y,z) cos(x) + cos(y) + cos(z);
and now I would like to add my own contour line
which created base on curvature (k).
which k can be calculated by (the function of x, y, z)
syms x y z
f = cos(x) + cos(y) + cos(z);
fx = diff(f,x);
fy = diff(f,y);
fz = diff(f,z);
fxx = diff(fx,x);
fxy = diff(fx,y);
fxz = diff(fx,z);
fyx = diff(fy,x);
fyy = diff(fy,y);
fyz = diff(fy,z);
fzx = diff(fz,x);
fzy = diff(fz,y);
fzz = diff(fz,z);
mat = [fxx fxy fxz fx; fyx fyy fyz fy; fzx fzy fzz fz; fx fy fz 0];
no = det(mat);
de = (fx^2 + fy^2 + fz^2)^2;
k = de/no;
how can I add my curvature contour line ?

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