STL parsing: face interpretation

Help Speckle v1 (old)
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1

Hey everyone!
Does anyone have an idea, how to extract the faces array from a stl file? Is there any information within the file format possibly? I manage to upload the mesh object, but the face interpretation is not quite as expected. :wink: So far, I am using the same earcut method as tom, but it seems that it is not working for stl…

2

Hey Simon,

Not sure. I’ve never done it before. I only grokked this from wikipedia:

UINT8[80] – Header
UINT32 – Number of triangles


foreach triangle
REAL32[3] – Normal vector
REAL32[3] – Vertex 1
REAL32[3] – Vertex 2
REAL32[3] – Vertex 3
UINT16 – Attribute byte count
end

Which looks straight forward enough… If you share the code, and maybe a screenshot of what’s happening, that could help.

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Hey dimitrie, thank you for that! I managed to put upload them as stl files have a fixed vertex order and are triangulated, so I am uploading every single triangle as a mesh object. Would that be the way to go? Or does it make more sense to upload all of them in one single mesh object?

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Oh, for sure one single mesh object! it’s 100x more efficient!