maybe this fix already had before in this thread, but if not i just want to share this fix.
When using mods character from a creator and you want to use hanmen next-gen face on your mod character.
And if the mod creator does not provide the card with SSS or Next gen properties inside the card, your character face will look like in the 1st head mod picture attachment (it will show some black line or spots around the face).
This is example character mod Xyth-Ada Wong, this mod does not have the card that support SSS or next-gen.
so what i do is:
1. Download AssetStudio v0.16.47 to export the the face asset
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To export the face asset you need to find the character mod textures.unity3d file inside abdata/chara folder and drag the file to AssetStudio and then export the assets. If the character mod only have zipmod, you'll need to change the file extension to zip file and then extract the textures.unity3d file (dont forget to change back the file extension to zipmod).
2. There are 2 face assets that need to be export. look at the attachment. The export file will be in PNG extension.
Just make a new folder inside mods folder (i just name it Next-Gen Texture) and put the PNG file inside it.
Basically you need to find the face assets for importing to NailMask & SubsurfaceAlbedo inside material editor later.
3. Open Material Editor, import the 2 PNG face assets, the 1st face asset goes to Nailmask, the 2nd face asset goes to
SubsurfaceAlbedo.
4. Only for xyth mod: xyth use lips texture inside Paint-2, after you do the 3rd step you need to adjust the size and position of the lip texture, so that the lips texture will match with the character mod.
5. Maybe also adjusting few color, brightness, & contrast for the Face & Body with material editor if you have neck seams issue.
6. Lastly after done all step, the character mod will be like the 2nd head mod picture.
i use this fix base on trial and error, if anyone have a better way please let me know. thx