All that stuff gets sorted automagically.
The nice thing about how Granny stores the files is that We can INSERT stuff that does NOT load! Extract a 3D model from a GR2 file and look at it!
You'll see repeats of verts or textures that NEVER actually get called by any Face!
So I balance the counts to match the largest of the input.
In your case? V and VT will equal VN.
The faces will be sorted which moves the VT placement of textures in the obj file.
Thus one set of Faces that point to properly sorted information!
Now since We NEVER call the extra information? It never gets loaded!
I did try to point all this out to TDW several times. But I'm not sure he caught the idea so went with his way of doing the Loose Import.
That, as We all know, causes HUGE increases in file size. Not only that but EACH line needs to be loaded to display properly in Game.