geometry-sdf-techniques

A 2D Signed Distance Field smooths jagged coastlines by providing continuous distance data for terrain blending. It enables shader-based edge softening and multi-zone coastal transitions to produce smooth land-ocean boundaries in terrain visuals.

Distance fields for terrain grids can be generated using CPU-based exact Euclidean Distance Transforms, BFS seeding, or GPU Jump-Flood Algorithms. These offline strategies bake continuous distance data into textures or per-vertex attributes for shader integration.

fwidth-based anti-aliasing stabilizes coastline rendering by adjusting edge softening based on screen-space derivatives. Combined with world-unit scaling, it ensures zoom-stable land-ocean boundaries across varying camera distances in terrain shaders.

GPU SDF generation works for large terrain grids using the Jump-Flood Algorithm to efficiently compute distance fields. This GPU approach supports world-unit scaling and produces distance data suitable for shader-based multi-zone coastal transitions.

Continuous distance data is needed for coastline rendering to eliminate jagged boundaries and enable smooth blending between land and sea. A 2D Signed Distance Field provides this data, allowing shaders to apply edge softening and realistic water-land delineation.