import { type ProbeTriangle, type SpawnProbeResult } from './spawnProbe';
import type { Bounds, Vec3 } from './types';
/**
 * Cross-asset ground spawn probing.
 *
 * The single-sheet importer probed the one mesh that backed collision. A
 * multi-asset package's collision is spread across N placed proxy meshes, so
 * the probe must consider candidate surfaces across ALL of them — in world
 * space, after each instance's placement transform — and reuse the same
 * canopy/rooftop rejection rules: a column with more than one separated surface
 * is a roof or a canopy over ground, never a spawn point.
 */
export declare function readGlbTriangles(bytes: Buffer): Promise<ProbeTriangle[]>;
/** Applies a TRS placement transform to every triangle vertex. */
export declare function placeTriangles(triangles: readonly ProbeTriangle[], transform: {
    position: Vec3;
    rotation: [number, number, number, number];
    scale: Vec3;
}): ProbeTriangle[];
/**
 * Probes a standing position against the union of all placed collider proxies.
 * Triangle reads are deduplicated by resource and capped: a pack of thousands
 * of high-poly proxies must not build an unbounded triangle list just to find
 * open ground, so beyond the cap vertices are stride-sampled evenly across the
 * whole set instead of taken from whichever asset happened to be read first.
 */
export declare function probeMultiAssetSpawn(input: {
    /** One entry per PLACED instance; `bytes` should be shared (deduped) upstream. */
    colliders: ReadonlyArray<{
        bytes: Buffer;
        transform: {
            position: Vec3;
            rotation: [number, number, number, number];
            scale: Vec3;
        };
    }>;
    bounds: Bounds;
    clearanceHeightM: number;
    maxTriangles?: number;
}): Promise<SpawnProbeResult>;