Newb question re NIF files, FO4 & Bodyslide

[TJHinSkyrim]

Got a bit of a basic question about how .nif files work with Fallout 4 and Bodyslide.

 

If memory serves me correctly, Skyrim used two different body meshes for the low weight and high weight variations of a body. Accordingly, when generating a body type, Bodyslide used to generate two meshes (with the suffixes _0 & _1)

 

Fallout 4 appears to use a single .nif file for the PC body mesh and again, Bodyslide appears to only generate a single mesh for a body type.

 

Given that Fallout 4 has a three-directional slider for body shapes (thin, muscular, large), I was wondering how the game applies the relevant weightings given there's only a single .nif file. Is there are another file that the game refers to in order to affect this?

 

If so, it is possible to preview (or even adjust) the effects of this file in Bodyslide? I can see there's one slider in Bodyslide marked "VanillaFo4" and I presume that this simply changes the weighting between the "thin" and "large" body shapes. Is this correct?

[leatherliz]

The FO4 triangle slider modifies bones in the skeleton to distort the body, where Skyrim kinda blended between two meshes. Someone else could probably give a more technically correct answer.

 

The 'VanillaFO4' slider is just a slider that makes the CBBE body closely match the proportions of the vanilla body mesh.

[TJHinSkyrim]

Thanks - that helps a little. Someone else mentioned that the weightings are done via hex editing using the body.nif as the centre point of the triangle.  Busty is an example of a mod that edits the hex values changing the way the in game slider changes the meshes.