Importing Hair Mesh from Another Game! Help Is Needed!!

Hi. This is not the original uv map, someone just clicked on Smart uv project and called it a day. I found her whole model on renderhub for free

Anyway, the process of adapting mesh-based items for the game is the same. You should first watch a tutorial about converting any cas item ( but preferably hair) to ts4 or how to make alpha hair to learn how to navigate blender interface and what each steps does, we do not teach the basic in this section of the forum. Then do the following:

- clone any hair for the feminine frame, export the mesh, open it in 2,76 - 2.79 version of blender, delete all meshgroups;
- import the obj from the file, in the outliner shift-select all imported items that are NOT hair ( or bandana ) and then press Delete in the 3d view;
- select bandana, switch to Edit mode, select its uvs in the uv editor and press S X -256 to move them away from where the hairs uvs are;
- shift-select all parts of the hair beside bandana and press Ctrl J in the 3d view to join them;
- select hair and set this image as the background in the uv editor. Once you'll do it, they will stretch vertically. Select them with A and press S Y 0,5 to shrink them. Then put them in the space meant for hair;
- do the same for a bandana but put it in the space meant for hats if you want;
- join the bandana with the hair;
- unfold rig,make the head_2 selectable;
- select the hair, rename the uv map to uv_0, duplicate it, name it uv_1. Add data transfer modifier, choose head_2 as Source object, set the rest like in the pic, apply;
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- create b__Head__ and assign the whole hair to it;

- vertex paint the mesh with 007f00;
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- assign type and a cut number, duplicate the hair 2 times, change their cut numbers to 0000, 0001, 0002

- export a uv layout and use it to edit the diffuse;
- import the mesh in s4s and change shaders of all meshgroups to simglass;
- check the mesh in s4s, you may encounter the transparency issue, read this whole thread

No, that is not it. You encounter the transparency issue in the game. S4s does not use the same rendering engine as the game, it cannot preview how the mesh will look like in the game. Pay no mind to how the transparent textures are displayed in s4s.

Sorry, could not check the file right away. This is not a transparency issue, the underside of strands is just facing the wrong direction. The fastest way to deal with that is to remove it and add a new one
-enable Backface culling and make sure it is always enabled;
- select everything with A, Tools - Remove doubles, set Merge distance to 0,0001;
- add Solidify modifier, change thickness, uncheck Fill rim, apply

Also, you did not transfer a uv_1, the hair will not morph properly

As I mentioned in the list, use head_2

I’m not sure if understood you right, but the difference between the first and the second one is in how they are made and textured. In ts4 the hair is not dynamic and won’t move like the real hair would, if that’s what you mean

Smooth in a what way? Texture? Slick, like, no strands poking out? 
You can edit the mesh and the texture yourself, it should be covered in the frankenmeshing tutorials