Use two colormaps on 3D figure.

Hello Mathwork's community!

I've used the surf function in order to get the attached figure.

I was wondering if I could use two different colormaps so that when z<= 10 I could use for example colormap winter. And when z>10 use colormap summer.

Any ideas on how I can achieve this succesfully?

Thank's in advance for your time.

Santos

Answer 1

[Adam Danz]

Follow this demo. The colorbar ranges approximately from -6 to 8 and the transition between Winter and Summer colormaps happens at 2.

Key variables

• h - handle to the surface object
• transitionValue - the color value where the transition should happen
• n - the total number of values in the combined colormap (the more the better).
• ax - the axis handle.

[X,Y,Z] = peaks(25);
h = surf(X,Y,Z);
axis square
colorbar

% set transition value
transitionValue = 2; 
n = 256; % number of colormap value
ax = gca(); 

% change colormap. Use winter below transition value
% and summer above transition value. 
clim = [min(h.CData(:)), max(h.CData(:))];  % range of color values
np = round(abs(clim - transitionValue) / range(clim) * n); %number of color values from each colormap
cmap = [winter(np(1)); summer(np(2))];
ax.Colormap = cmap;
ax.CLim = clim;

[Santos García Rosado]

Thank you Adam! I just adjusted your demo to my code and is working great!

[Adam Danz]

Great to hear!