...
Input Parameters
b2r Texture
This expects the first derivative map, let H be a height field, then each channel are defined as r=dH/du, g=dH/dv, b=dontcarea b2r texture generated by txmake. If you are using RFM, RFH or RFB, the Texture Manager can take care of that for you.
See the txmake documentation for details.
Texture Type
Map type to be used as your Bump Roughness Map
...