/**
 * NullObject
 *
 * An empty object used for organization and IK (inverse kinematics) targets.
 * Useful for animation rigging and scene organization.
 */
import { OutlinerElement, OutlinerElementData } from './outliner_element';
import { Vector3 } from '../modeling/transform';
export interface NullObjectData extends OutlinerElementData {
    position?: Vector3;
    ik_target?: string;
    ik_source?: string;
    lock_ik_target_rotation?: boolean;
}
export declare class NullObject extends OutlinerElement {
    position: Vector3;
    ik_target?: string;
    ik_source?: string;
    lock_ik_target_rotation: boolean;
    constructor(data?: NullObjectData, uuid?: string);
    get origin(): Vector3;
    extend(object: NullObjectData): this;
    /**
     * Flip null object along axis
     */
    flip(axis: 0 | 1 | 2, center?: number): this;
    /**
     * Get world center position
     * Framework adapters should override this for their coordinate system
     */
    getWorldCenter(with_animation?: boolean): Vector3;
    static behavior: {
        movable: boolean;
        hide_in_screenshot: boolean;
    };
}
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