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Posted: Oct 8th, 2025 - Modified: Nov 30th, 2025

Upload a grayscale heightmap image to begin.

Upload a heightmap, then select a view below.

Original surface

Eroded surface

Erosion Filter

Surface Fitting options Surface type Blur Width 0.010

Erosion settings Strength 0.22 Scale 0.15 Gully weight 0.50 Detail 1.50 Cell scale 0.70 Normalization 0.50 Fade target Default height 0.45

Input height range Floor 0.45 Ceiling 0.65

Erosion Rounding Ridge 0.10 Crease 0.00 Multiplier 0.10

Erosion Onset Initial Onset 0.70 Gully Onset 1.25

Erosion Octaves Octaves 5 Gain 0.50 Lacunarity 2.00

Example Image Table Prototype

Erosion shader: Advanced Terrain Erosion Filter and Phacelle Noise by Rune Skovbo Johansen, copyright (c) 2025, licensed under the Mozilla Public License 2.0. Source: ShaderToy sf23W1 and Rune's writeup.

B-spline reconstruction follows Lee, Wolberg, and Shin's multilevel B-spline approximation method for scattered data interpolation.

Input image