How to slice an outer surface plot to reveal an inner surface plot in MATLAB?

I have the following sample code which creates two 3D plots on the same axes and which overlay each other:

[X,Y,Z] = peaks(75);
[Xa,Ya,Za] = peaks(50);
figure
surf(X,Y,Z)
colormap(spring)
shading(interp)

hold on
surf(Xa,Ya,Za)
colormap(winter)
shading(interp)
hold off

grid off
xlabel('X')
ylabel('Y')
zlabel('Z')
title('Surface Plot')

I wish to remove a portion of the first outer plot [surf(X,Y,Z)] to reveal the second inner plot [surf(Xa,Ya,Za)]. The cross-section of the segment to be removed should be a quadrant of the first plot in the XY plane.

Please advise on how this can be done in MATLAB?

Thanks!

Answer 1

[Bruno Luong]

Use NaN to remove points you don't want to see, adapt to your need

[X,Y,Z] = peaks(75);
[Xa,Ya,Za] = peaks(50);
Z(X<0 & Y<0) = NaN;
Za = -1-0.5*Za;
%Za(Xa<0 & Ya<0) = NaN;
figure
surf(X,Y,Z,'FaceColor','b')
hold on
surf(Xa,Ya,Za,'FaceColor','y')

[Shiraz Kaderuppan]

Thanks, this worked perfectly! 👍😊