Is it possible to 3D print a 3D function plotted in Matlab?

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Lewis HC
Lewis HC 2023-7-12
回答： Cris LaPierre 2023-7-13
Greetings to all, I am trying to convert a 3D function plotted in Matlab (or convert it to STL file) to be able to print it in 3D, I am using the stlwrite command but it does not work, I attach my code, I appreciate any suggestions:
% Define your 3D function (example: parabolic function)
a = 1;
b = 2;
c = 3;
myFunction = @(x, y) a*x.^2 + b*y.^2 + c;
% Generate a mesh
x = linspace(-10, 10, 100);
y = linspace(-10, 10, 100);
[X, Y] = meshgrid(x, y);
Z = myFunction(X, Y);
% Triangulate the mesh
triangulation = delaunayTriangulation(X(:), Y(:), Z(:));
% Save the triangulated mesh as an STL file
filename = 'my_mesh.stl';
stlwrite(filename, triangulation.ConnectivityList, triangulation.Points);
  2 个评论
Star Strider
Star Strider 2023-7-12
Please go ito a bit of detail about the problem. What does ‘it does not work’ mean? What is the result of using stlwrite?
Rahul
Rahul 2023-7-12
Please make sure that the stlwrite function is correctly downloaded and it's path has been set correctly.
You can know about this from here: stlwrite - write ASCII or Binary STL files - File Exchange - MATLAB Central (mathworks.com)

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回答（3 个）

Niranjan Sundararajan
stlwrite - write ASCII or Binary STL files - File Exchange - MATLAB Central (mathworks.com)
Not an official implementation of stlwrite but it works. Paste the function in your current working directory and rename it stlwrite. Then, you can call it by using:
stlwrite(filename, X, Y, Z);
It will work.
Cris LaPierre
Cris LaPierre 2023-7-12
编辑：Cris LaPierre 2023-7-12
Your syntax for stlwrite is not correct. It should be stlwrite(TR,filename)
However, the input triangulation must be a triangulation object or 2-D delaunayTriangulation object. You are using a 3D delaunay triangulation.
Finally, there is no thickness to your object, which will prevent it from being able to be 3D printed.
  2 个评论
Niranjan Sundararajan
Niranjan Sundararajan 2023-7-13
stlwrite does not work for 3-D implementation currently in the MATLAB function. And author of this question wants to plot 3-D stl file. Is there some official MATLAB implementation for the same.
Cris LaPierre
Cris LaPierre 2023-7-13
They do not want to plot it. They want to save it to an STL file and 3D print it.

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Cris LaPierre
Cris LaPierre 2023-7-13
Ran in:
I would point you to this post: https://www.mathworks.com/matlabcentral/answers/623773-how-to-generate-a-stl-file-starting-from-a-3d-figure#answer_525658
This may be what @Niranjan Sundararajan is referring to. In that thread, the accepted answer suggests using the file exchange stlwrite function to create a 3D stl.
Here is code that works for me:
% Define your 3D function (example: parabolic function)
a = 1;
b = 2;
c = 3;
myFunction = @(x, y) a*x.^2 + b*y.^2 + c;
% Generate a mesh
x = linspace(-10, 10, 5);
y = linspace(-10, 10, 5);
[X, Y] = meshgrid(x, y);
Z = myFunction(X, Y);
% Triangulate the mesh
TR = delaunayTriangulation(X(:),Y(:),Z(:))
TR =
delaunayTriangulation with properties: Points: [25×3 double] ConnectivityList: [58×4 double] Constraints: []
figure
tetramesh(TR)
% Save the triangulated mesh as an STL file
filename = 'my_mesh.stl';
stlwrite(filename,X,Y,Z);

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