Hi guys, I have issue my hair. with Place created hair . i have only one side face (front face) , now i need Backface it same like Front Face. But i dont know do that. i inport to Unity , it not good for me : how can fix ? i dont want duplicate 2 face model :(
You're better off duplicating the faces, if you use a double sided shader you'll need to create your own shadow caster and receiver pass for the shader to handle that, too.
The easiest option for Unity would be duplicating the faces. If you don't want that, you need to find a good double-sided shader that supports all the different maps you want to use with right lighting calculation.
There is no 2 sided shader in unity? Then you will need one if you don't want to manually duplicate and flip the faces. I think a two sided shader would do nothing more than viewing the dot between the camera and the normals, and flip the normals when its reaching 90 degrees.