Asked by Ano
on 4 Dec 2018

Hello!

I have an STL file which contains the facets and vertices. My concern is about the way the facets are saved because I have noticed that the facets don't seem to have any common nodes with each other which is not obvious for me, so it would be very much appreciated if anyone can tell if this is normal or I am having some problem in my file!

Note: I have attached a screenshot of the STL file

Thank you and best regards!

Answer by Cris LaPierre
on 5 Dec 2018

Edited by Cris LaPierre
on 5 Dec 2018

Accepted Answer

How are you reading the file into MATLAB? If I follow the example on the stlread documentation, I can import and plot the mesh.

data = stlread('femur.stl');

trimesh(data,'FaceColor','none','EdgeColor','k')

The interesting thing is the numbers from the various files are different.

- stlread imports 33332x3 points and 66670x3 ConnectivityList
- Your screenshot shows the values similar to what I see in ConnectivityList, but 178726x3 of them.
- fv contains 66674x3 faces and 200022x3 vertices. How were faces and vertices created?

Cris LaPierre
on 5 Dec 2018

Also, I suspect you are using a file exchange function, while I am using the function that comes with MATLAB. Please run the command

which stlread

I get 'C:\Program Files\MATLAB\R2018b\toolbox\matlab\polyfun\stlread.m'

Poornima Jayamani
on 15 Oct 2019

Cris LaPierre
on 18 Oct 2019

Hard to say without seeing your file, but it sounds like you might need to clean up your stl file first. How was it generated?

Consider checking to see if the file is 3D printable. Also consider running it through an stl repair routine (many available online) just in case.

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