内挿補間するのはどうでしょうか。例をあげときます。
[X,Y] = meshgrid(-1:.3:1,-2:.3:2);
V = 0.75*Y.^3 - 3*Y - 2*X.^2;
mesh(X,Y,V);
F = griddedInterpolant(X',Y',V','spline');
[Xq,Yq] = ndgrid(-1:.1:1,-2:.1:2);
Vq = F(Xq,Yq);
figure
mesh(Xq',Yq',Vq')
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