Find a column of Z direction in 3D model

Question

Sara 2021-8-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1437229-find-a-column-of-z-direction-in-3d-model

评论： Sara 2021-8-20

采纳的回答： DGM

magnetite_DATA_1.txt

在 MATLAB Online 中打开

Hello,

I am working on the 3D model. what I want to do is find a columns in Z direction.

So I can find the xy postions by using ginput function but I do not know how to find all positns postions in Z direction for xy poriton that I select.

filename = uigetfile('*.*')
A = importdata (filename);
symbole = A.textdata(:,1);
x0 = A.data(:,1);
y0 = A.data(:,2); 
z0 = A.data(:,3);
figure, 
scatter3(x0,y0,z0);
% view([0 0 1]);axis equal;
xlabel('x'); ylabel('y');zlabel('z')
G1 = ginput;
plot3(G1(1,1),G1(1,2),z0,'o', 'color','k'); 

As you can see I want to use xy postions that I obtained by using ginput to plot the z-direction coordinates for this specific xy.

what I get from that is code is NOT shown me right plot of z- dreiction in selected xy

NOTE:

I attached a txt file contains coordnates of xyz. I obtained this xyz coordinates from using VESTA.

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Answer 1

DGM 2021-8-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1437229-find-a-column-of-z-direction-in-3d-model#answer_770949

在 MATLAB Online 中打开

Idk if this is more what you're after:

A = importdata('magnetite_DATA_1.txt');
symbole = A.textdata(:,1);
x0 = A.data(:,1);
y0 = A.data(:,2); 
z0 = A.data(:,3);
 
scatter3(x0,y0,z0);
xlabel('x'); ylabel('y'); zlabel('z')
% do selection in 2D
view(2); axis equal; hold on
G1 = ginput;
% find the samples near G1
m = any(sqrt((x0-G1(:,1).').^2 + (y0-G1(:,2).').^2)<=0.65,2);
plot3(x0(m),y0(m),z0(m),'o', 'color','k'); 
view(3) % switch back to 3D