Resolved: How to read triangles and vertices of the model from the STL format?

Question:

I need to get information about the vertices and triangles of the STL format model, please tell me how to extract this data in ThreeJS

Answer:

You can use the STLLoader class for this task. So you define an instance of the loader and use it to load a STL asset from a specific path. In the onLoad() callback, you get an instance of BufferGeometry representing the geometry data from the STL file.
Keep in mind that the geometry is non-indexed. So the faces/triangles are defined by three consecutive vertices in the position buffer attribute.
Full example: https://threejs.org/examples/webgl_loader_stl

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