Kite Demo Erosion mask?

Development Rendering
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Could someone point out which texture (or texture rgba element) is used as the mask multiplier to
expose the T_Tile_PebblyRiverbank_D.TGA texture in the Kite Demo Landscape erosion flows?
(see yellow lines in screenshot)

I inspected the master landscape material, its texture usage and their rgba components, but can’t seem to find where
the subtraction is happening. I’m assuming it is a texture that was generated by WorldMachine but I just can’t pin down where it is being applied. I also looked in each material function used by each layer, so unless I am missing something it must be somewhere else.

I am assuming that an erosion flow (alluvial fan) mask is being used but that could be completely wrong and why I can’t find such a texture. My assumption is based on a comment by Ryan Brucks here (time index30:53):

Thanks!

70275-erosion_flows.jpg
70275-erosion_flows.jpg882×797 253 KB

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I have since deleted all textures from the project and cleared the DerivedDataCache but still can’t find where the erosion mask came from.
The only thing for sure is that the mask disappears if Sample ‘GreenGrass’
(GreenGrass_LayerInfo) is disconnected. Unfortunately there is no association to any texture in GreenGrass_LayerInfo.

See screenshot comment.

70352-flowmapinvestigation2.jpg
70352-flowmapinvestigation2.jpg1920×1080 452 KB

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Found it!

I was trying to figure out what was so special about GreenGrass_LayerInfo and how the landscape material used it. Now I know the erosion texture is actually ‘within’ layer info itself.

If I right-click on GreenGrass_LayerInfo there are options to import/export layer info.
I did so out of curiosity and voila! hidden inside the layerinfo.png is the erosion mask I couldn’t find.

Presumably it was imported at some point during development of the demo.