SoilMachine-style layered erosion
help, it's too slow and doesn't make rivers.
there has to be a way to do it fast enough big enough.
https://html.cafe/x52f5db84?k=15065ee6770417740c51a35eb1bda2c150a7128f
1024x1024 layered terrain, SoilMachine-style water particles, weighted unsorted cascade, flood, and seep. Everything else kept simple.
Slice row
Top view: downsampled preview of the full 1024x1024 world. Ground brightens with height; surface water tints blue.
Vertical slice through the selected world row. Colors are layer types; blue shows pooled surface water.