Levelling of 3D built in stl file

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Noor Mohammad
Noor Mohammad 2019-8-6
评论： DGM 2025-6-27
Hello Community,
I have a stl file of 3D image. This image is titled 45 degree. I want to level (project) it on a plane so that I could get z values (height of the different parts of the cracks). For details please have a look at the attachment. This is sample which contains many cracks. Some of the cracked are elevated, i.e., curled ups. I want to know the height of these curlings. Thanks.
  2 个评论
darova
darova 2019-8-6
You forgot to attach the image :(
Noor Mohammad
Noor Mohammad 2019-8-6
编辑：Noor Mohammad 2019-8-7
It is uploaded now. Thanks drova for your response.

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回答（1 个）

KSSV
KSSV 2019-8-7
编辑：KSSV 2019-8-7
Download this file exchange function:
https://in.mathworks.com/matlabcentral/fileexchange/22409-stl-file-reader
[t,p] = stlread('Tr_3.stl') ;
% Rotate along z axes by 45 degrees
th = 45 ;
R = [cosd(th) -sind(th) 0 ; sind(th) cosd(th) 0 ; 0 0 1] ; % Rotation matrix
pr = p*R ; % Rotate the points
pr(:,3) = pr(:,3)-mean(pr(:,3)) ;
% plot
trisurf(t,pr(:,1),pr(:,2),pr(:,3),'EdgeColor','none')
xlabel('x')
ylabel('y')
zlabel('z')
  5 个评论
显示 3更早的评论
KSSV
KSSV 2019-8-7
Okay.....the points have been shifted to (x,y) plane and mean is removed along z......wont this work out?
DGM
DGM 2025-6-27
Ran in:
I'm going to assume that the datum is the lowest point, since the material can't intersect with the container.
% for the forum
unzip Tr_3.zip
% Inputs
T = stlread('Tr_3.stl'); % built-in since R2018b
th = -45; % parameter
% Since we're using the built-in reader
F = T.ConnectivityList;
V = T.Points;
R = [1 0 0; 0 cosd(th) -sind(th); 0 sind(th) cosd(th)]; % Rotation matrix
Vr = V*R; % Rotate the points around x
Vr(:,3) = Vr(:,3) - min(Vr(:,3)); % Remove z-offset
% Plot
trisurf(F,Vr(:,1),Vr(:,2),Vr(:,3),'EdgeColor','none')
xlabel('x')
ylabel('y')
zlabel('z')
axis equal
●

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