ValleyFill Node

Fill valleys using thermal scree deposition and height-based blending.

Category

Erosion/Deposition

Inputs

Name	Type	Description
input	VirtualArray	Input heightmap.
mask	VirtualArray	Mask defining the filtering intensity (expected in [0, 1]).
noise	VirtualArray	No description

Outputs

Name	Type	Description
deposition	VirtualArray	No description
output	VirtualArray	Eroded heightmap.

Parameters

Name	Type	Description
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.
Duration	Float	Controls the number of erosion iterations or the simulated time span during which thermal erosion is applied. Higher values increase slope relaxation and material transport.
Scree Max Elevation	Float	No description
Deposition Gamma	Float	Gamma applied to the height-based mixing mask.
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.
Preserve Input Range	Bool	No description
Deposition Ratio	Float	Blend ratio controlling valley influence.
Scale with Elevation	Bool	Defines the critical talus angle (repose slope) above which material becomes unstable and moves downslope during thermal erosion.
Slope	Float	Selects the thermal erosion variant or behavior model, controlling how material is redistributed when slopes exceed the talus angle.

Example

Corresponding Hesiod file: ValleyFill.hsd. Use [Ctrl+I] in the node editor to import a hsd file within your current project.

Note

Example files are kept up-to-date with the latest version of Hesiod. If you find an error, please open an issue.