How can I analyze stl files and then redraw them in matlab? I need to write some code

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JoshT_student
JoshT_student 2018-6-15
移动：DGM 2025-6-30
Hello
I need help and guidance.
This is the goal. I need to write code in matlab to analyze some stl pictures and then redraw it in matlab. I could also use solidworks too, but I don't have a lot of experience in solidworks. Anything helps Thanks

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KSSV
KSSV 2018-6-15
  1 个评论
JoshT_student
JoshT_student 2018-6-15
Thank you, but I need more than that. I need some idea how to write code. I now have my data points from the curve fitting app. I just don't know how to use code to make the SEM image again. I attached my data points.

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DGM
DGM 2025-6-30
移动：DGM 2025-6-30
Ran in:
For context:
https://www.mathworks.com/matlabcentral/answers/405855-how-do-i-redraw-a-picture-given-to-me-using-its-data-points-that-i-ve-found-using-the-curve-fitting
I have no idea where this was going, but here's an implausible interpretation of "STL from pseudobinary image":
unzip stuff.zip % for the forum
% an antialiased RGB image
inpict = imread('SEM.png');
% get rid of extraneous channels
inpict = im2gray(inpict);
% binarize it and get the blob boundaries
mk = imbinarize(inpict);
[Vc,~,nblobs] = bwboundaries(mk);
% show boundary curves atop the mask
imshow(mk); hold on
for k = 1:nblobs
plot(Vc{k}(:,2),Vc{k}(:,1),'linewidth',2)
end
% flip a bunch of stuff
for k = 1:nblobs
% the source is an image, so we probably want to invert Y
Vc{k}(:,1) = size(inpict,1) - Vc{k}(:,1) + 1;
% flipping Y means we need to flip the boundary direction
% also need to remove duplicate vertex on closure
% B is [y x]; we need that flipped too
Vc{k} = Vc{k}(end-1:-1:1,[2 1]);
end
% consolidate the vertex list
V = cell2mat(Vc);
% construct the edge lists in the same direction
% the vertex lists in Vc don't need to be the same length
sz = cellfun(@(x) size(x,1),Vc); % length of each vertex list
szc = [0; cumsum(sz)];
E = zeros(0,2);
for k = 1:numel(Vc)
v = 1+szc(k):szc(k+1);
thisE = [v; circshift(v,-1)].';
E = [E; thisE];
end
% TRIANGULATION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% do a constrained triangulation to generate the triangles
T = delaunayTriangulation(V(:,1:2),E);
Warning: Duplicate data points have been detected and removed.
The Triangulation indices and constraints are defined with respect to the unique set of points in delaunayTriangulation.
F = T.ConnectivityList(isInterior(T),:);
V = T.Points;
% or better yet, use mesh2D (FEX #25555)
%[V,~,F,~] = refine2(V,E);
% clean up leftover points
[F V] = pruneunusedverts(F,V);
% display it using patch()
figure
patch('faces',F,'vertices',V, ...
'facecolor','w','edgecolor','k');
axis equal; grid on
xlabel('X'); ylabel('Y')
% EXTRUSION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% extrude the part into 3D
[F V] = extrude(F,V,50); % pick a thickness
% write to file
stlwrite(triangulation(F,V),'testfile.stl')
% display it using patch()
figure
patch('faces',F,'vertices',V, ...
'facecolor','w','edgecolor','none');
view(3); camlight; view(10,33)
axis equal; grid on
xlabel('X'); ylabel('Y'); zlabel('Z')
●
For other interpretations, see also:
Generate a lofted relief from a 2D depthmap image
https://www.mathworks.com/matlabcentral/answers/1926360-plotting-3d-surface-using-depth-map-and-grey-scale-image#comment_3031456
Similar lofting or dithering for a lithophane
https://www.mathworks.com/matlabcentral/answers/2104036-generate-3d-model-from-a-2d-image
Yeah, but how would i do the lofting in 2012???
https://www.mathworks.com/matlabcentral/answers/54069-how-can-i-turn-a-grayscale-image-into-a-stl-3d-file
Extruding a logical image
https://www.mathworks.com/matlabcentral/answers/254154-how-can-i-produce-a-stl-file-from-a-2d-image

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