import * as THREE from 'three';
import type { Axis } from './modifiers.js';
/** Optional position/Euler-rotation/scale applied when grouping or placing objects. */
export interface Transform {
    position?: [number, number, number];
    rotation?: [number, number, number];
    scale?: number | [number, number, number];
}
/** Group `children` under one `Group` with an optional {@link Transform} applied. */
export declare function createGroup(children?: THREE.Object3D[], transform?: Transform): THREE.Group;
/** Options for {@link layoutGrid}: column count (default √n), `spacing`, and layout plane. */
export interface GridLayout {
    cols?: number;
    spacing?: number;
    plane?: 'xz' | 'xy';
}
/** Arrange objects in a centered grid on the `xz` (default) or `xy` plane, mutating their positions. Returns the same array. */
export declare function layoutGrid(objects: THREE.Object3D[], options?: GridLayout): THREE.Object3D[];
/** Options for {@link layoutRadial}: circle `radius`, `startAngle`, and whether items rotate to face the center. */
export interface RadialLayout {
    radius?: number;
    startAngle?: number;
    faceCenter?: boolean;
}
/** Arrange objects evenly around a circle in the ground plane, optionally facing the center. Mutates positions; returns the same array. */
export declare function layoutRadial(objects: THREE.Object3D[], options?: RadialLayout): THREE.Object3D[];
/** Stack objects along `axis` at `spacing` intervals, centered on the origin. Mutates positions; returns the same array. */
export declare function layoutStack(objects: THREE.Object3D[], axis?: Axis, spacing?: number): THREE.Object3D[];
/** World-space bounding box of an object and all its descendants. */
export declare function groupBounds(obj: THREE.Object3D): THREE.Box3;
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