import { Camera, Object3D, Ray, Vector3 } from 'three';
/**
 * A type definition representing a collection of 3D nodes where each node is identified by a unique string key.
 */
export type Nodes = {
    [x: string]: Object3D;
};
/**
 *
 * A utility class providing helper methods for various operations.
 */
export declare class Utils {
    private static readonly _plane;
    private static readonly _temp;
    /**
     * Calculates the intersection point of a ray with a plane in world coordinates.
     * @param ray - The ray to intersect with the plane.
     * @param camera - The camera used as a reference for the plane's orientation.
     * @param distance - The distance from the camera to the plane.
     * @returns The intersection point as Vector3.
     */
    static getSceneIntersection(ray: Ray, camera: Camera, distance: number): Vector3;
    /**
     * Set for all children of the target, the draggable flag to true and a dragTarget.
     * @param target - The Object3D whose children you want to enable as draggable elements.
     * @param dragTarget - The Object3D that will act as the drag target for the children.
     */
    static setChildrenDragTarget(target: Object3D, dragTarget: Object3D): void;
    /**
     * Computes bounding spheres for child objects within the specified Object3D hierarchy.
     * @param target - The root Object3D from which to start computing bounding spheres for children.
     */
    static computeBoundingSphereChildren(target: Object3D): void;
    /**
     * Retrieves a map of objects in the scene graph (Object3D) starting from a root object.
     * Each object is mapped using its unique name as the key in the resulting object.
     * @param target - The root object to begin generating the object map from.
     * @returns An object containing objects mapped by their names.
     */
    static getNodes(target: Object3D): Nodes;
    protected static generateNodesFromObject(object: Object3D, nodes: Nodes, nameCollision: {
        [x: string]: number;
    }): Nodes;
    protected static getNodeName(object: Object3D, nameCollision: {
        [x: string]: number;
    }): string;
}
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