Epic 147: OGC 3D Tiles 1.1 point-cloud tileset export - #103
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Add the interchange-tiles3d feature with a dependency-free pnts codec, a validated tileset.json model, and a deterministic octree tileset builder. Tiles store positions relative to a per-tile RTC_CENTER to preserve f32 precision, internal geometric error halves per level, and leaves carry zero error. The facade re-exports the surface and the tiles3d_export example converts a PCD through voxel downsample into a tileset consumable by any 3D Tiles 1.1 runtime.
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Summary
Adds the
interchange-tiles3dfeature tospatialrust-interchangefor deterministic OGC 3D Tiles 1.1 point-cloud tileset export. This differentiates SpatialRust from potree/PDAL/Open3D by letting any 3D Tiles runtime (CesiumJS, digital-twin hosts) stream SpatialRust point clouds directly.Deliverables (Epic 147)
pntsbinary codec: 28-byte header, feature-table JSON, POSITION/RGB/RTC_CENTER, 8-byte-aligned padding, strict validation, exact round-trip decode.tileset.jsonmodel: asset 1.1, geometric error, box bounding volumes, refine, content URIs, children, 64-level nesting bound.interchange-tiles3dfeature,tiles3d_exportexample (PCD → voxel → tileset), andtiles3d_smokeend-to-end test.Contract
spatialrust-core, serde, or GPU backend); public APIs take&[f32]/optional&[u8].Verification
cargo test -p spatialrust-interchange --features tiles3d— 20 testscargo test -p spatialrust --features "interchange-tiles3d io-pcd" --test tiles3d_smoke-D warningsclean for both crates;cargo fmt --all --checkclean