MATLAB: How to overlay two surf plots

overlaysurf

Hi everyone,

I am trying to overlay the contour stroke shape into the colorful surf plot

Here the code i've tried but it doesnt work, it only show the left image above

hold on
surf(X,Y,-M1); surf(-X,Y,M1);   %Reflection along y axis
surf(X,Y,Ta);  surf(-X,Y,Ta);      %Stroke Contour

view(0,-90)

% plane z=x,
figure
hold on
fsurf(@(x,y) x)
% plane z = y
fsurf(@(x,y) y)
view(3)

You have to find first value in each column

ii = zeros(columns,1)
jj = 1:columns;
for j = 1:columns
    ii(j) = find(M(:,j)>200,1,'last');
end
L = hypot(diff(jj),diff(ii));