Island Node

This function generates a procedural island heightmap from a binary land mask by combining a distance-based radial profile with fractal noise modulation.

Category

Primitive/Geological

Inputs

Name	Type	Description
dr	VirtualArray	Input radial noise. Optional, if not set, the embedded default noise generator is used.
land_mask	VirtualArray	Binary mask defining the island’s footprint; nonzero pixels are considered land. Consider using the node IslandLandMask to generate this mask.

Outputs

Name	Type	Description
inland_mask	VirtualArray	Output buffer receiving a mask of inland pixels (non-coastal land).
out	VirtualArray	No description
water_depth	VirtualArray	Output water depth map representing flooded areas.

Parameters

Name	Type	Description
Elevation Scaling Factor	Float	Global elevation scale.
Smoothing Radius	Float	Radius of the smoothing filter applied to the distance transform with respect to a unit domain.
Smoothing Coefficient	Float	Smoothing factor applied to the final radial profile for continuity.
Lee-Side Amplitude	Float	Strength of lee-side erosion.
Lee-Side Angle	Float	Direction (angle) used to compute lee-side erosion.
Amplitude	Float	Overall amplitude of the noise added to the terrain surface.
Direction Angle	Float	Rotation angle of the noise field, allowing oriented terrain features.
Smoothing Coefficient	Float	Smoothing factor.
Spatial Frequency	Wavenumber	Base spatial frequencies in the X and Y directions.
Octaves	Integer	Number of FBM layers used to build the noise (more octaves means more detail).
Rugosity	Float	Persistence-like factor controlling roughness decay between FBM octaves.
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.
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.
Radial Noise Intensity	Float	Strength of radial displacement noise applied to deform the island outline.
Radial Profile Gain	Float	Exponent controlling how quickly elevation falls off from center to shore.
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.
Apex Slope	Float	Slope at the summit.
Upper Slope Limit	Float	Maximum slope value allowed in the radial profile.
Lower Slope Limit	Float	Minimum slope value used in shaping the radial profile.
Slope Noise Intensity	Float	Amount of noise applied to locally vary the slope and break uniform gradients.
Shoreline Slope	Float	Slope at the shoreline.
Uplift Amplitude	Float	Amplitude of uplift deformation.
Water Decay Rate	Float	Water depth decay with the distance to the shoreline.
Water Depth Level	Float	Maximum deth of water.

Example

Corresponding Hesiod file: Island.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.

Screenshots