import { Group, Vector3, Plane, Scene } from 'three';
export declare class AreaTool3d {
    group: Group;
    private pointsGizmo;
    private contourLines;
    private areaMesh;
    private helpersScene;
    /** Confirmed 3D vertices of the polygon. */
    points: Vector3[];
    projectionPlane: Plane;
    /** Computed area in m² (for the UI label). */
    areaText: number;
    /** Perimeter in mm (for the UI label). */
    perimeterText: number;
    /** Screen position of the UI label (centroid of the polygon). */
    labelX: number;
    labelY: number;
    private centerOfMass;
    constructor(helpersScene: Scene);
    setProjectionPlane(plane: Plane): void;
    reset(): void;
    addPoint(point: Vector3): void;
    private removeMesh;
    private renderArea;
    private getLocal2DPoints;
    private alignMeshToPlane;
    private calculate2DArea;
    private calculateCenterOfMass;
    updateLabel(viewerElement: any, camera: any): void;
    dispose(): void;
}