feat: add 3D extension#2211
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3D solid processing for CityJSON / 3DBAG / CityParquet city models: enclosed volume, closed/manifold/oriented validation, footprint area, building height, and 3D distance on SOLID_3D / GEOM_3D types. Self-contained C++ kernel. Repo: cityjson/duckdb-3d-extension @ a08f240 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Add the
three_dcommunity extension.This extension makes the polyhedral solids in 3D city models — buildings from CityJSON / 3DBAG / CityParquet — first-class, queryable values in DuckDB. It exposes solid-aware types and PostGIS-style
ST_*/ST_3D*functions for measuring enclosed volume, footprint area and building height, validating topology, and running 3D distance queries, all on a self-contained C++ kernel (no CGAL/SFCGAL).Key Features
SOLID_3D(closed polyhedral solids, topology-preserving payload) andGEOM_3D(points/lines/polygons/surfaces).ST_3DVolume,ST_3DSurfaceArea,ST_Area(footprint),ST_ZMax − ST_ZMin(height).ST_3DIsClosed/ST_3DIsManifold/ST_3DIsOriented/ST_3DValidationReport.ST_3DDistance,ST_3DDWithin,ST_3DClosestPoint,ST_3DShortestLine.cityjsonextension:ST_3DFromWKB(geometry, geometry_properties)on its per-LOD WKB output.Source Repository: https://github.com/cityjson/duckdb-3d-extension