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Use two colormaps on 3D figure.

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Santos García Rosado
Santos García Rosado on 13 Apr 2021 at 14:36
Commented: Adam Danz on 14 Apr 2021 at 14:51
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

Accepted Answer

Adam Danz
Adam Danz on 14 Apr 2021 at 2:00
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;
  2 Comments
Adam Danz
Adam Danz on 14 Apr 2021 at 14:51
Great to hear!

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