import { Vector3 } from "./Vector3.ts";
/** Bounding sphere defined by center and radius. */
export declare class Sphere {
    #private;
    constructor(centre?: Vector3, radius?: number);
    get centre(): Vector3;
    set centre(value: Vector3);
    get radius(): number;
    set radius(value: number);
    clone(): Sphere;
    containsPoint(point: Vector3): boolean;
    copy(sphere: Sphere): Sphere;
    distanceToPoint(point: Vector3): number;
    equals(sphere: Sphere): boolean;
    intersectsSphere(sphere: Sphere): boolean;
    translate(offset: Vector3): Sphere;
    /**
     * Sets this sphere to tightly bound the given points. If optionalCenter is
     * provided it is used as the sphere centre; otherwise the centroid is used.
     */
    setFromPoints(points: Vector3[], optionalCenter?: Vector3): this;
    /**
     * Expands the sphere radius to include the given point if it lies outside.
     * The centre is not moved.
     */
    expandByPoint(point: Vector3): this;
}
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