import type { Vec3 } from '../math';
import type { Camera } from 'three/webgpu';
import { Matrix4 } from 'three/webgpu';
export declare const LABEL_OFFSET_EPS = 1e-9;
export declare const choose_site_label_offset: (bond_directions: Vec3[], base_offset: Vec3) => Vec3;
export type LabelPlacement = {
    x: number;
    y: number;
    visible: boolean;
};
export declare class LabelProjector {
    #private;
    update(camera: Camera, anchor_world_matrix: Matrix4, size: {
        width: number;
        height: number;
    }, margin: number): void;
    place(position: Vec3, offset: Vec3, visual_radius: number, out: LabelPlacement): void;
}