wrapping a value onto 3D surface of an irregular pipe

Question

BeeTiaw 2020-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508846-wrapping-a-value-onto-3d-surface-of-an-irregular-pipe

评论： BeeTiaw 2020-3-6

采纳的回答： darova

在 MATLAB Online 中打开

Dear all,

I have generated the following 3D plot showing the surface of an irregular cylinder.

The plot was created from the known X, Y and Z coordinate (the data is attached to this post in three separate *.txt files)

I used the following iteration to generate the plot:

xori = load('Xhole.txt');
yori = load('Yhole.txt');
depth = load('Depth.txt');
figure('Position',[100,50,800,600]);
plot3(yori,xori,-1*depth+0*xori,'color',[.5 .5 .5]);hold on
for ii = 1:length(depth)    
       
    plot3(yori(ii,:),xori(ii,:),-1*depth(ii)+0*xori(ii,:),'k-');
    hold on
    
    view([65 -90 90]);
    xlabel('x');
    zlabel('Depth (z)');
    ylabel('y');
    set(gca,'DataAspectRatio',[1 1 3.5]);
    axis tight
    set(gca,'XTickLabel',[]);
    set(gca,'YTickLabel',[]);
end

I got two questions now:

Is there any other workaround to generate a similar plot that is more elegant than the above code?

Suppose I have the 4th-dimension, i.e. values at each X-Y-Depth pair, how do I wrap the value onto the 3D plot? I am thinking of generating a plot shown below:

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Answer 1

darova 2020-3-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508846-wrapping-a-value-onto-3d-surface-of-an-irregular-pipe#answer_418538

编辑：darova 2020-3-4

在 MATLAB Online 中打开

Here is the succesfull solution

X = load('Xhole.txt');
Y = load('Yhole.txt');
Z = load('Depth.txt');
Z = repmat(Z,[1 180]);
R = hypot(X,Y);
cla
surf(X,Y,Z,'edgecolor','none','facecolor','interp');
alpha(0.4)
hold on
surf(X./R*5,Y./R*5,Z,'cdata',R);
hold off
axis vis3d
caxis([min(R(:)) max(R(:))])