Question about STL file
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Hello
I have a vector file as xyz How can I calculate normal vector? How can I create a stl file?.
what is the facet in stl file?
Thanks.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/231348/image.png)
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Rik
il 25 Lug 2019
Modificato: Rik
il 25 Lug 2019
An stl file has two parts. One part contains triplets of vertex IDs, and the other part contains the xyz coordinates of each vertex. The triplets tell you the three corners of a face of your mesh.
In principle there can be more than three IDs, but triangular meshes are the most usual.
The data you have seems to only be the faces array, although maybe the vertices array is hidden in the last part of your array.
Also, the faces array describes the vertices, not the normal vector of that face.
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Rik
il 26 Lug 2019
The face variable describes how you need to connect the vertices to form your mesh, so without more information or assumptions it's impossible to tell what the face variable should be. You only have a point cloid, not a mesh.
Also, I'm puzzled why you accepted the other answer. It doesn't sound like it solved your problem
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jahanzaib ahmad
il 25 Lug 2019
https://uk.mathworks.com/matlabcentral/fileexchange/20922-stlwrite-write-ascii-or-binary-stl-files?s_tid=srchtitle
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