import { Behaviour } from "./Component.js";
import { Renderer } from "./Renderer.js";
/**
 * Defines a single LOD level with its transition distance and associated renderers.
 * Used by {@link LODGroup} to configure level of detail switching.
 */
export declare class LODModel {
    /** Screen height ratio (0-1) at which this LOD becomes active */
    screenRelativeTransitionHeight: number;
    /** Distance from camera at which this LOD becomes active */
    distance: number;
    /** Renderers to show at this LOD level */
    renderers: Renderer[];
}
/**
 * LODGroup manages multiple levels of detail for optimized rendering.
 * Objects switch between different detail levels based on distance from camera.
 *
 * LOD levels are defined in {@link LODModel} objects, each specifying:
 * - The distance at which that level becomes active
 * - The {@link Renderer} components to show at that level
 *
 * This is useful for performance optimization - showing high-detail models up close
 * and lower-detail versions at distance where the difference isn't visible.
 *
 * **Progressive Loading:**
 * For automatic texture/mesh LOD streaming, see the `@needle-tools/gltf-progressive` package
 * which provides progressive loading capabilities independent of this component.
 *
 * **Debug options:**
 * - `?debuglods` - Log LOD switching information
 * - `?nolods` - Disable LOD system entirely
 *
 * @summary Level of Detail Group for optimizing rendering
 * @category Rendering
 * @group Components
 * @see {@link LODModel} for configuring individual LOD levels
 * @see {@link Renderer} for the renderers controlled by LOD
 * @see {@link LODsManager} for programmatic control of progressive LODs
 * @link https://npmjs.com/package/@needle-tools/gltf-progressive
 */
export declare class LODGroup extends Behaviour {
    /** Array of LOD level configurations */
    readonly lodModels: LODModel[];
    private _lods;
    private _settings;
    private _lodsHandler?;
    start(): void;
    onAfterRender(): void;
    private onAddLodLevel;
    private _distanceFactor;
    /**
     * Adjusts all LOD transition distances by a multiplier.
     * Values > 1 push LOD transitions further away (higher quality at distance).
     * Values < 1 bring transitions closer (better performance).
     * @param factor Multiplier to apply to all LOD distances
     */
    distanceFactor(factor: number): void;
}