Fast and Gorgeous Erosion Filter (blog.runevision.com)

The post describes a fast, GPU-friendly shader technique for generating realistic-looking mountain erosion—branching gullies and ridges—without simulating water drops. It builds on earlier ShaderToy “eroded terrain noise” implementations, explaining the underlying octave-based stripe method, how it avoids chaotic artifacts by using per-cell stripe pivots and blending, and how the author refines peak/valley behavior with two slope-dependent strategies (a “frequency” approach and a “fade” approach). The article also provides implementation-focused details intended to complement a companion video.