interpolate points of a .stl file

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Lorenzo Bennati
Lorenzo Bennati 2020-11-29
编辑： Rahul 2025-5-13
Hi everyone,
I am new to Matlab,
My question is if it is possible to load a .stl file and after interpolate the points of this file in order to recreate a close surface. I attached two images to describe better the situation: Image 1 represents my imput .stl and i want to interpolate the points in order to obtain the image 2.
Any help would be appreciated.
Thanks.
Lorenzo
IMAGE 1
IMAGE 2

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回答（1 个）

Rahul
Rahul 2025-5-13
编辑：Rahul 2025-5-13
Hi @Lorenzo Bennati,
I understand that you wish to obtain an interpolated form of your 3D figure which is loaded in MATLAB through a stl format. The following steps can be considered to obtain an interpolated version of your model.
  • Read the '.stl' file in MATLAB using 'stlread' function.
  • Use a 'meshgrid' function to obtain the grid to interpolate.
  • Use a function like 'scatteredInterpolant' to interpolate the data points.
  • Use 'alphaShape' function if the surface is required to be closed.
The following MATLAB Answer also gives a good explanation:
https://www.mathworks.com/matlabcentral/answers/506848-interpolate-points-of-a-3d-point-cloud
The following MathWorks documentations can be referred:
'stlread': https://www.mathworks.com/help/matlab/ref/stlread.html
'meshgrid': https://www.mathworks.com/help/matlab/ref/meshgrid.html
'scatteredInterpolant': https://www.mathworks.com/help/matlab/ref/scatteredinterpolant.html
'alphaShape': https://www.mathworks.com/help/matlab/ref/alphashape.html
Thanks.

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