.obj anatomy as relates to Poser:

#: a comment line. I usually sign and date my models with a comment line.

v lines: this indicates vertex coordinate positions, it's possible to create something called a squished morph with an .obj containing only these lines. Such a morph target will only move vertices to the indicated position and contains no facet data. It's a rather old school way of redistributing morphs without sharing the model itself.

vt lines: this will contain (in a basic sense) the models uv information.

vn lines: this is the normal data for the .obj, it's not required by Poser as poser establishes this during import.

f lines: here's the meat and potatoes of the .obj file. You'll find your g tags (groups) and usemtl tags (material regions) here. You'll see how the f lines are broken into sections defined by those 2 tags. Sometimes you'll also find a mtllib reference, this indicates a reference to a .mtl file if one such is generated by the app you created or saved the .obj out of.

That's the very basics of .obj. Hope that's a start.

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