import { ActionBehavior, ContextManager, ActionBehaviorConstructorProps, Component, Observable } from '@zcomponent/core';
/**
 * Sets the gravity factor of a physics body.
 * @zicon vertical_align_center
 * @zbehavior
 * @zgroup Physics Actions
 */
export declare class SetGravityFactor extends ActionBehavior {
    protected zcomponent: import("@zcomponent/core").ZComponent<any>;
    /**
     * The rigidbody target.
     * @zprop
     * @zvalues behaviorids three/Object3D/Physics/RigidBody
     */
    rigidbody: string;
    /**
     * The gravity factor to set.
     * @zprop
     * @zgroup Physics
     * @zgrouppriority 20
     * @zdefault 1
     */
    gravityFactor: Observable<number, never>;
    constructor(contextManager: ContextManager, instance: Component, props: ActionBehaviorConstructorProps);
    /** @zprop */
    perform: () => void;
    /** @zui */
    preview(): void;
}