Due to DirectX 11 instructions such as "DECLARE_TEX2DARRAY" you can use up to 12 textures (12 * 4 = 48 - albedo, normal, mask, bump) for Unity terrain. You can even try 16 textures, by editing shader ...
The tool outputs images that have LUT UVs encoded in the Red and Green channels. A shader can be used to apply the colours in the LUTs back to the sprite.
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