How to generate a .stl file starting from a 3d figure

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Hi everyone,
I'm dealing with the following problem:
I need to generate an .stl of the 3d figure that I have achieved with the following code (the one shown here below). I saw that a possible oprion is to use the function "surf2stl" however I'm unable to implement its inputs.
Does anyone know how to write the inputs of this function?
Any other suggestions are really appreciate.
Thanks for the attenction.
Vcub=[0 0 0; 1 0 0; 0 1 0; 0 0 1;1 1 1; 0 1 1; 1 0 1; 1 1 0];
%Vcub(:,2)=2*Vcub(:,2);
N=100;
seeds=1.5*rand(N,3)-0.25;
[Ver,Cel,C_tst]=voronoi3d_cuboid(seeds,Vcub);
figure
hold on
axis('equal')
view([-36 27])
for k = 1:length(Cel)
if ~isempty(Cel{k})
col= rand(1,3);
Vk = Ver(Cel{k},:);
Fk = convhull(Vk);
if exist('mergeCoplanarFaces.m','file')==2
[Vk, Fk] = mergeCoplanarFaces(Vk, Fk);
for i=1:length(Fk)
patch('Vertices',Vk,'Faces',Fk{i},'FaceColor',col,'FaceAlpha',0,'LineWidth',3,'EdgeAlpha',1,'EdgeColor','k')
end
else
trisurf(Fk,Vk(:,1),Vk(:,2),Vk(:,3),'FaceColor',col, ...
'FaceAlpha', 1,'EdgeAlpha',1,'EdgeColor','k');
end
end
end
xlabel('X');
ylabel('Y');
zlabel('Z');
  2 Comments
Tonino Nucifora
Tonino Nucifora on 23 Oct 2020
The error the software gives to me is the following:
Error using stlwrite (line 25)
Input argument must be a triangulation object.
Error in demo_voronoi3d_cuboid (line 42)
stlwrite('mytriangulation.stl',struct('faces',Fk, 'vertices',Vk));
What is wrong?
Thank you
Vcub=[0 0 0; 1 0 0; 0 1 0; 0 0 1;1 1 1; 0 1 1; 1 0 1; 1 1 0];
%Vcub(:,2)=2*Vcub(:,2);
N=100;
seeds=1.5*rand(N,3)-0.25;
[Ver,Cel,C_tst]=voronoi3d_cuboid(seeds,Vcub);
figure
hold on
axis('equal')
view([-36 27]) %3D
% scatter3(seeds(:,1),seeds(:,2),seeds(:,3),25, ...
% 'Marker','o','MarkerFaceColor',[1 0 0], 'MarkerEdgeColor','k');
% scatter3(Ver(:,1),Ver(:,2),Ver(:,3),25, ...
% 'Marker','o','MarkerFaceColor',[0 1 0], 'MarkerEdgeColor','r');
for k = 1:length(Cel)
if ~isempty(Cel{k})
col= rand(1,3);
Vk = Ver(Cel{k},:);
Fk = convhull(Vk);
if exist('mergeCoplanarFaces.m','file')==2
[Vk, Fk] = mergeCoplanarFaces(Vk, Fk);
for i=1:length(Fk)
h=patch('Vertices',Vk,'Faces',Fk{i},'FaceColor',col,'FaceAlpha',0.6,'LineWidth',3,'EdgeAlpha',1,'EdgeColor','k');
end
else
trisurf(Fk,Vk(:,1),Vk(:,2),Vk(:,3),'FaceColor',col, ...
'FaceAlpha', 0.5,'EdgeAlpha',1,'EdgeColor','k','LineWidth',5);
end
end
end
xlabel('X');
ylabel('Y');
zlabel('Z');
stlwrite('mytriangulation.stl',struct('faces',h.Fk, 'vertices',h.Vk));

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Accepted Answer

Arpit Bhatia
Arpit Bhatia on 27 Oct 2020
Hi Tonino,
You need to download the stlwrite.m file from the following link: https://in.mathworks.com/matlabcentral/fileexchange/20922-stlwrite-write-ascii-or-binary-stl-files
(Please note that this file has not been created by or maintained by MathWorks)
With the stlwrite.m file in the same folder as the file with the above code, add the following command to the end of your code to generate the required stl file.
stlwrite('mytriangulation.stl',struct('faces', Fk, 'vertices',Vk));
The reason you were earlier facing the error “Input argument must be a triangulation object” is that you were calling the default MATLAB stlwrite function which requires a triangulation as an input argument. To use that function, you will need to first create a triangulation as specified below.
TO = triangulation(Fk,Vk(:,1),Vk(:,2),Vk(:,3));
trisurf(TO,'FaceColor',col, ...
'FaceAlpha', 1,'EdgeAlpha',1,'EdgeColor','k');
stlwrite(TO,'test.stl')
  4 Comments
Akshay Kumar Pakala
Akshay Kumar Pakala on 10 Mar 2022
Hey Arpita Bhatia
I would like to know if the stlwrite function works to create the entire voronoi cuboid if i store the Vk and Fk matrices at every loop into 2 seperate cells or in two different multi-dimensional dimensional matrix respectively?
Thank you

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