Levelling of 3D built in stl file

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Noor Mohammad
Noor Mohammad 2019-8-6
评论： KSSV 2019-8-7
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')
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Noor Mohammad
Noor Mohammad 2019-8-7
Actually, I want to something like this attachment. I want to measure the height of the curling cracks using the z-values obtained from matlab. I think it would be clear now. Thank you so much for your efforts..
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?

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