The scale of x,y,z in UV map is different

[2294462474]

_min = np.amin(verts, axis=0, keepdims=True)
_max = np.amax(verts, axis=0, keepdims=True)
verts = (verts - _min) / (_max - _min)``

I think here is wrong, the scale of x,y,z is different

[Lotayou]

Great observation. I've not managed to solve this problem yet, since humans possess varying body shapes and builds, but should all be normalized to [0,1] for UV coordinate conversion in order to fuly utilize the RGB range. Think you have a better solution for this? Feel free to submit a PR:)