HydraulicSaleve Node

Simulates hydraulic erosion using a stream power law on an adaptive triangulated mesh. The terrain is converted to a mesh, eroded through flow accumulation and slope-driven processes, then projected back to a heightmap. The main influencing parameters are 'Drainage Exponent' and 'Maximum Slope (Domain Center)', which drive most of the terrain shaping.

Inputs

Name	Type	Description
dx	VirtualArray	Displacement with respect to the domain size (x-direction).
dy	VirtualArray	Displacement with respect to the domain size (y-direction).
input	VirtualArray	No description
mask	VirtualArray	No description

Outputs

Name	Type	Description
output	VirtualArray	No description

Parameters

Name	Type	Description
Control Points Count	Integer	Number of vertices in the adaptive triangulated mesh. Higher => more details, slower computation.
Deposition Radius	Float	Spatial extent where sediment is redistributed. Larger => smoother, more diffused deposition.
Activate	Bool	Enables or disables the built-in drainage noise. If an external noise input is provided, it overrides this default noise.
Spatial Frequency	Float	Base spatial frequencies in the X and Y directions.
Amplitude	Float	Noise amplitude.
Type	Enumeration	Noise type.
Seed	Random seed number	Random seed number. The random seed is an offset to the randomized process. A different seed will produce a new result.
Smoothness	Float	Controls the resulting smoothness of the fractal layering process.
Drainage Noise Strength	Float	Adds spatial perturbation to flow directions. Breaks symmetry and produces more natural, irregular drainage patterns.
Enable Smoothing	Bool	No description
Sediment Deposition Strength	Float	Amount of material deposited during erosion. Higher => more filling of valleys and flatter basins.
Shape Preservation Strength	Float	No description
Interpolation Method	Choice	No description
Drainage Exponent	Float	Controls how strongly water flow (drainage area) influences erosion. Higher values => channels concentrate more => sharper river networks.
Max. Iterations	Integer	Hard cap on simulation steps.
Gain	Float	Mid-centered gain transformation applied to the elevation values. This is a non-linear recurve operator centered around the mid elevation (typically 0.5). Increasing the gain pushes values toward the minimum and maximum elevations, creating flatter low/high regions with a steeper transition around the midpoint.
Gamma	Float	Standard gamma correction applied to the elevation values. This is a monotonic power-law remapping that shifts emphasis toward low or high elevations, making the overall shape sharper or bulkier without changing its ordering.
Invert Output	Bool	Inverts the output values after processing, flipping low and high values across the midrange.
Mix Factor	Float	Mixing factor for blending input and output values. A value of 0 uses only the input, 1 uses only the output, and intermediate values perform a linear interpolation.
Mix Method	Enumeration	Method used to combine input and output values. Options include linear interpolation (default), min, max, smooth min, smooth max, add, and subtract.
Remap Range	Value range	Linearly remaps the output values to a specified target range (default is [0, 1]).
Saturation Range	Value range	Modifies the amplitude of elevations by first clamping them to a given interval and then scaling them so that the restricted interval matches the original input range. This enhances contrast in elevation variations while maintaining overall structure.
Smoothing Radius	Float	Defines the radius for post-processing smoothing, determining the size of the neighborhood used to average local values and reduce high-frequency detail. A radius of 0 disables smoothing.
Terrain Shape Preservation	Bool	Modulates erosion resistance based on height. Typically preserves peaks and reduces flattening.
Seed	Random seed number	Random seed number. The random seed is an offset to the randomized process. A different seed will produce a new result.
Maximum Slope (Domain Center)	Float	Upper bound on slope in central regions. Prevents unrealistic steep gradients.
Minimum Slope (Domain Border)	Float	Upper bound on slope constraint near boundaries. Helps stabilize edges and avoid artifacts.
Influence Exponent	Float	Shapes how flow intensity affects fine erosion. Higher => more concentrated erosion.
Fine Erosion Strength	Float	Controls small-scale channel carving (secondary erosion). Enhances details like rills and small streams.
Erosion Strength	Float	Blend factor between original terrain and eroded result. Low => subtle erosion, High => fully eroded terrain.
Convergence Tolerance	Float	Threshold for stopping iterations. Lower => more precise but slower convergence.
Uniform Slope Limiter	Bool	If enabled, uses a single slope limit everywhere. Otherwise, slope varies spatially (center vs borders).
Uplift Rate	Float	Constant terrain elevation increase per iteration. Competes with erosion => defines long-term mountain vs valley balance.

Example

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