You can find out by yourself
[X,Y] = meshgrid(0:10);
Z = 0*X;
Z(5:7,5:7) = nan;
surf(X,Y,Z,'edgecolor','none')
[X1,Y1] = meshgrid(0:0.4:10);
Z1 = griddata(X,Y,Z,X1,Y1);
hold on
surf(X1,Y1,Z1,'facecolor','none')
hold off
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