Color a .ply according to Y value

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Sushmitha Kudari
Sushmitha Kudari 2020-3-8
评论： Ameer Hamza 2020-3-9
I have the follwing plot that I generate: Instead of having the background be white, i want the peaks of the curves to be white and as they increase in value, I want them to get darker. Does anyone have suggestions for this. The code and data file generates is linked HERE.
  2 个评论
Ameer Hamza
Ameer Hamza 2020-3-8
where is the file 'MunkS_500Hz.shd.mat'? It is also needed to run that code.
Sushmitha Kudari
Sushmitha Kudari 2020-3-8
munkProfile = load('MunkS_500Hz.shd.mat');
pressureWave = munkProfile.pressure;
pressureWave = abs(pressureWave);
squished = squeeze(pressureWave);
logged = log(squished);
[X,Y]=ndgrid(1:size(logged,1),1:size(logged,2 ));
plot_mat = [X(:) Y(:) logged(:)];
[remove, ~] = find(plot_mat(:,3) == -Inf);
plot_mat(remove,:) = [];
sorted = sortrows(plot_mat, 3);
colorMat = addColor(sorted);
ptCloud_Coral = pointCloud(sorted,'Color',colorMat);
figure
pcshow(ptCloud_Coral);
Linking .mat : HERE

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-3-8
What is the current colormap, you can reverse it by flipping the colormap matrix.
figure
p = pcshow(ptCloud);
colormap(gray)
p.Colormap = flipud(p.Colormap);
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Sushmitha Kudari
Sushmitha Kudari 2020-3-9
It looks the same but for example I need the points at 600,0 to be white, not like this:
Ameer Hamza
Ameer Hamza 2020-3-9
You can create your own colormap. For example,
figure
colors = ...
[zeros(8, 3);
gray(10);
ones(12, 3)];
p = pcshow(ptCloud);
colormap(colors);
creates following figure

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