Actually The Hair Builder generate nothing, it is premade Hair parts for to put together.
If you want, you make your own Hair cards and Strand Texture. I highly recommend the Blender Hair Creator that come with this package. Has nothing to do with Reallusion, but is additional included in this package
It is an Add-on for Blender and have all what a 3D Hair Designer needed.
I love this tool, it is so easy to use and save huge time.
It extracts hair cards from any Quad mesh, you can draw Hair strands, use particle Hair and generate Mesh Hair cards and even create own Hair strands texture with all needed maps.
Really nice !
At that time I had bought the Hair Creator separately, if I had known that Reallusion was making such a great offer here, I would have rather waited.
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liebe Grüße vidi