import { Behavior, ContextManager, Observable } from '@zcomponent/core';
import { Object3D } from '../components/Object3D';
/**
 * A behavior that overrides the opacity of the object.
 *
 *
 * It iterates over all the materials of the object and sets their opacity to the value of the behavior.
 *
 * This behavior is registered to run at design time.
 *
 * @see https://threejs.org/docs/?q=materia#api/en/materials/Material.opacity
 * @zbehavior
 * @zparents three/Object3D/**
 * @zgroup Appearance
 * @zicon opacity
 */
export declare class OverrideOpacity extends Behavior {
    instance: Object3D;
    /**
     * The opacity to set on the object.
     * A value of 0.0 indicates fully transparent, 1.0 is fully opaque.
     * @zprop
     * @ztype proportion
     * @zdefault 1
     */
    opacity: Observable<number, never>;
    /**
     * Whether to set the opacity as a proportion of the original value.
     * @zprop
     * @zdefault true
     */
    asProportionOfOriginalValue: Observable<boolean, never>;
    private _defaultValues;
    /**
     * Constructs a new OverrideOpacity Behavior.
     * @param contextManager - The context manager.
     * @param instance - The Object3D instance.
     */
    constructor(contextManager: ContextManager, instance: Object3D);
    private _update;
    private _handleMaterial;
    private _setOnMaterial;
    private _unsetOnMaterial;
    /**
     * Disposes the OverrideOpacity Behavior.
     */
    dispose(): never;
}