/** Copyright (c) 2021 The v3d Authors. All rights reserved.
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 */
import { Nullable, Scene, SceneOptimizer, SceneOptimizerOptions } from "@babylonjs/core";
export declare class V3DSceneOptimizer {
    private readonly scene;
    /**
     * Customized scene optimizer options.
     * @private
     */
    private _options;
    get options(): SceneOptimizerOptions;
    set options(value: SceneOptimizerOptions);
    /**
     * SceneOptimizer
     * @private
     */
    private readonly _optimizer;
    get optimizer(): SceneOptimizer;
    constructor(scene: Scene, options?: Nullable<SceneOptimizerOptions>);
    private static CustomOptimizerOptions;
    private setupFocusEvents;
}