Since a mesh is made of thousands or millions of triangles, it is tidy to keep
the data in separate files and include them in the .pov file whenever necessary.
I mean something like

#declare Vertices = read from vertices.txt;
#declare Faces = read from faces.txt;

mesh2 {
   vertex_vectors {
      N_vertices,
      Vertices
   }
   face_indices {
      N_faces,
      Faces
   }
}


fopen directive of POV-Ray reads the file into variables,
#read (FILE_HANDLE_IDENTIFIER,MyString,MyFloat,MyVect)

I don't know if it works as vertices and faces are thousands/millions of
vectors.

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