/**
 * Region 3D export (spec: issue #34 §"Technical Implementation Steps" —
 * region export; ported from a sibling project's proven implementation
 * rather than rebuilt from scratch, per direct instruction). Draw a 2D
 * footprint over loaded 3D Tiles content (BIM/`BIMLayer`, `Tile3DLayer`)
 * and export exactly the triangles inside it as a portable GLB — or a
 * b3dm-wrapped GLB for pipelines (Cesium, 3D Tiles tooling) that expect
 * that container.
 *
 * Deliberately simpler than the source implementation in one respect: tile
 * selection is a plain bbox prefilter (`tileGeoBounds` vs. the ring's own
 * bbox) rather than the source's mesh-sampling/loose-footprint heuristics —
 * those exist there to avoid walking every triangle of city-scale national
 * tilesets before an exact clip; at this library's current single-tileset
 * (BIM model) scale, bbox-prefilter-then-exact-clip is both simpler and
 * already correct (a tile outside the ring exact-clips to zero triangles
 * regardless), and the same geometric pipeline this module already needs
 * is reused straightforwardly if the heuristic layer becomes worth adding.
 *
 * No textures: BIM/IFC materials are flat colors, not textured meshes, so
 * the UV/image plumbing the source implementation carries is dead weight
 * here — dropped rather than kept for a case this library doesn't have.
 * Each triangle's own source color IS carried through, though — baked as
 * per-vertex `COLOR_0` (see `resolvePrimitiveColor`/`buildGlb`), not left
 * as an undifferentiated flat gray.
 *
 * PURE geometry/binary-writing core (this file) + a thin DOM-touching
 * driver (`region-export-run.ts`) that resolves the live tileset registry
 * and triggers the browser download — same split as terrain-sample.ts /
 * terrain-heightfield.ts.
 */
export type LngLatRing = Array<[number, number]>;
/** Closed (first === last) + CCW — committed draw rings arrive closed, previews open; both normalize the same way. */
export declare function normalizeRing(ring: LngLatRing): LngLatRing;
export interface B3dmBatchTable {
    /** batchLength: number of features encoded in the glb's `_BATCHID`; each property array below must have this length. */
    batchLength: number;
    /** Plain-JSON per-feature properties — entry i is feature i's value. Omit for a structurally-valid b3dm with no property data. */
    properties?: Record<string, unknown[]>;
}
export interface RegionExportResult {
    bytes: Uint8Array;
    triangleCount: number;
    format: "glb" | "b3dm";
}
/**
 * Clip every loaded tile's triangles across ALL given tilesets against
 * `ring`, re-frame the clipped result to a local ENU frame at the ring's
 * own centroid (portable — most viewers can't display ECEF-scale
 * coordinates), and pack it as GLB or b3dm. `null` when the ring or the
 * clip produces nothing (an empty region, or a ring drawn where nothing is
 * loaded) — the caller reports that distinctly from a thrown error.
 */
export declare function computeRegionExport(ring: LngLatRing, tilesets: Map<string, unknown>, options?: {
    format?: "glb" | "b3dm";
}): RegionExportResult | null;