import { CoefficientCombineRule } from '@dimforge/rapier3d';
export declare const PRIVATE: unique symbol;
export declare class PhysicsMaterial {
    /** @ignore */
    [PRIVATE]: {
        density: number;
        friction: number;
        bounciness: number;
        frictionCombine: CoefficientCombineRule;
        bouncinessCombine: CoefficientCombineRule;
        needsUpdate: boolean;
    };
    constructor({ density, friction, bounciness, frictionCombine, bouncinessCombine, }?: {
        density?: number;
        friction?: number;
        bounciness?: number;
        frictionCombine?: CoefficientCombineRule;
        bouncinessCombine?: CoefficientCombineRule;
    });
    get density(): number;
    set density(value: number);
    get friction(): number;
    set friction(value: number);
    get bounciness(): number;
    set bounciness(value: number);
    get frictionCombine(): CoefficientCombineRule;
    set frictionCombine(value: CoefficientCombineRule);
    get bouncinessCombine(): CoefficientCombineRule;
    set bouncinessCombine(value: CoefficientCombineRule);
    /** @ignore */
    get needsUpdate(): boolean;
}
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