Epic 147E: bounded COPC to 3D Tiles exporter - #104
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Add CopcNodeReader to spatialrust-io: opens a COPC file once, loads only hierarchy metadata, and yields one PointCloud per octree node in deterministic (level, x, y, z) order. spatialrust-interchange gains export_copc_tileset behind tiles3d-copc, which mirrors the COPC octree into tileset.json plus one pnts tile per node with a per-tile RTC_CENTER, bounded by max_level, without materializing the whole cloud. Add the tiles3d_copc_export example and facade-level E2E tests.
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Summary
Extends the Epic 147 3D Tiles work with a bounded COPC → 3D Tiles exporter. A COPC file's octree hierarchy is walked one node at a time and written as
tileset.json+ one.pntstile per node — the whole cloud is never materialized.Deliverables
spatialrust-ioCopcNodeReader(147E): opens a COPC file once, loads only hierarchy metadata, exposes nodes in deterministic(level, x, y, z)order, and reads onePointCloudper node on demand.spatialrust-interchangeexport_copc_tileset(featuretiles3d-copc): mirrors the COPC octree into atileset.json, writes onepntstile per node with a per-tileRTC_CENTER, bounds the hierarchy withmax_level, and returns a byte/point/tile receipt.interchange-tiles3d-copc,tiles3d_copc_exportexample, and facade E2E test.Contract
tiles3d-copcis the only interchange feature that pullsspatialrust-io/spatialrust-core; the basetiles3dcodec remains dependency-free.Verification
cargo test -p spatialrust-interchange --features tiles3d-copc— 22 testscargo test -p spatialrust --features "interchange-tiles3d-copc io-pcd io-copc" --test tiles3d_smoke-D warningsclean;cargo fmt --all --checkcleangrid.copc.laz→ 9 tiles / 200,000 points in ~2.4 MB pnts, no full-cloud materialization