Investigating further into version 4. Attached is (1) a new version of 
one of the previous height_fields, with more blur applied; (2) the 
rendered landscape with streams. There are a couple of instances where 
the ponding is showing its edge when the surface dips too steeply away 
(I guess): foreground left and right (look at the shadows).

[I still cannot understand what makes the "water pillars" shown in 
previous images. Maybe to do with completely flat surfaces and the 
edges? I am not sure where to look in the code to get a true grip on them.]

-- 
Thomas

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