import * as box3 from './box3';
import type { Vec3Like } from './types';
/**
 * Sphere storage: Float32Array length 4 [cx, cy, cz, radius].
 * Local brand (not part of the seven-piece SSOT); see box3.ts rationale.
 */
export type Sphere = Float32Array & {
    readonly __sphere: void;
};
/**
 * Sphere readable input: ArrayLike<number> of length 4 (ordering identical to Sphere).
 */
export type SphereLike = ArrayLike<number>;
/**
 * Create a Sphere. Defaults to a zero-radius sphere at the origin.
 */
export declare function create(cx?: number, cy?: number, cz?: number, radius?: number): Sphere;
/**
 * Grow the sphere so `point` lies inside (boundary inclusive). Returns `out`.
 *
 * If the sphere was empty (radius < 0) the call re-seeds the center to `point`
 * with radius 0. Otherwise the radius is set to max(current, distance(center, point)).
 */
export declare function expandByPoint(out: Sphere, point: Vec3Like): Sphere;
/**
 * True when `point` is inside `sphere` (boundary inclusive). Empty sphere
 * (radius < 0) contains nothing.
 */
export declare function containsPoint(s: SphereLike, point: Vec3Like): boolean;
/**
 * True when `sphere` overlaps `box` (boundary inclusive). Uses the standard
 * closest-point-on-AABB distance test.
 */
export declare function intersectsBox(s: SphereLike, b: box3.Box3Like): boolean;
/**
 * Build an enclosing sphere from `points` via AABB-center + max-distance
 * approximation. Empty `points` leaves the negative-radius empty sphere at
 * the origin.
 */
export declare function fromPoints(out: Sphere, points: readonly Vec3Like[]): Sphere;
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