The Hydraulic erosion node creates realistic erosion and deposition effects caused by rainfall and river flows. This simulation follows three basic rules: when water flows over terrain, it can erode it (i.e. carve rivers or at least weather the slopes); as water flows downhill, it transports the eroded materials with it; as the water settles out, it releases the suspended soil particles, thus creating sediment depositions.
To add a Hydraulic erosion node, right click in the Graph and select Create Node > Simulation > Hydraulic erosion.
The connectors from top to bottom correspond to:
Double click on the node to open its parameters:
The tile being calculated is highlighted and surrounded by a red frame. This is only visible if the erosion parameters window is open.
In order to export the flow map, use a Mask from heights node on the Water accumulation optional connector. Configure the Mask from heights node as an automatic gradient.
Watch our Hydraulic erosion node video tutorial (video of the Instant Terra beta version March 2018).
|Number of iterations:||Sets the number of iterations|
|Quantity of rain:||Quantity of falling water, in centimeters per second|
|Viscosity:||Change the fluid behavior and thus the erosion pattern|
|Erosive power:||The higher the value, the more terrain will be eroded by the flowing water|
|Rain impact:||Quantity of rock shattered by rain and transformed into sediment|
|Time increment:||Time that elapses between iterations, in seconds|
|Evaporation mask:||Quantity of evaporated water, in percentage per iteration|
|Deposition mask:||Acts as a localized sediment sink, allowing the user to erode without sediment transport|
|Show water:||Uncheck the option to view erosion without displaying any water on your terrain|
|Show sediment:||Uncheck the option to view the node without displaying any sediment|
Some combinations of the Advanced parameters may lead to a divergent simulation.
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