type Vec3 = [number, number, number];
/**
 * SpatialAudioZone.ts
 *
 * Region-based audio environments: reverb zones, ambient areas,
 * and audio portals for zone transitions.
 *
 * @module audio
 */
export interface ReverbPreset {
    name: string;
    decay: number;
    density: number;
    diffusion: number;
    wetLevel: number;
    earlyReflections: number;
}
export interface AudioZoneConfig {
    id: string;
    shape: 'box' | 'sphere';
    position: [number, number, number];
    size: Vec3;
    reverb: ReverbPreset;
    ambientClipId?: string;
    ambientVolume?: number;
    priority: number;
    fadeDistance: number;
}
export interface AudioPortal {
    id: string;
    position: [number, number, number];
    normal: Vec3;
    width: number;
    height: number;
    fromZoneId: string;
    toZoneId: string;
    attenuation: number;
}
export interface ZoneState {
    zoneId: string;
    blendWeight: number;
    isInside: boolean;
}
export declare const REVERB_PRESETS: Record<string, ReverbPreset>;
export declare class SpatialAudioZoneSystem {
    private zones;
    private portals;
    private activeZones;
    private listenerPos;
    addZone(config: AudioZoneConfig): void;
    removeZone(zoneId: string): void;
    getZone(zoneId: string): AudioZoneConfig | undefined;
    getZoneCount(): number;
    addPortal(portal: AudioPortal): void;
    removePortal(portalId: string): void;
    updateListenerPosition(pos: Vec3): void;
    private recalculate;
    private distanceToZone;
    getActiveZones(): ZoneState[];
    /**
     * Returns the highest-priority active reverb preset, blended by weight.
     */
    getEffectiveReverb(): ReverbPreset | null;
    isListenerInsideZone(zoneId: string): boolean;
    /**
     * Get portal attenuation between two zones.
     */
    getPortalAttenuation(fromZone: string, toZone: string): number;
}
export {};
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