/**
 * FoliageSystem.ts
 *
 * Instance-based foliage: scattering, density maps,
 * wind sway animation, LOD, and culling.
 *
 * @module environment
 */
export interface FoliageType {
    id: string;
    meshId: string;
    density: number;
    minScale: number;
    maxScale: number;
    alignToNormal: boolean;
    windResponse: number;
    castsShadow: boolean;
    lodDistances: number[];
}
export interface FoliageInstance {
    typeId: string;
    position: [number, number, number];
    scale: number;
    rotation: number;
    windPhase: number;
    lodLevel: number;
    visible: boolean;
}
export interface FoliagePatch {
    id: string;
    bounds: {
        x: number;
        z: number;
        w: number;
        h: number;
    };
    instances: FoliageInstance[];
    density: number;
}
export declare class FoliageSystem {
    private types;
    private patches;
    private windDir;
    private windStrength;
    private time;
    registerType(type: FoliageType): void;
    getType(id: string): FoliageType | undefined;
    getTypeCount(): number;
    setWind(dirX: number, dirZ: number, strength: number): void;
    getWind(): {
        dirX: number;
        dirZ: number;
        strength: number;
    };
    scatter(patchId: string, typeId: string, bounds: FoliagePatch['bounds'], count: number, seed?: number): FoliagePatch;
    update(dt: number, cameraPos: {
        x: number;
        z: number;
    }): void;
    getWindOffset(inst: FoliageInstance): [number, number, number];
    getPatch(id: string): FoliagePatch | undefined;
    getPatchCount(): number;
    getVisibleCount(): number;
    getTotalInstanceCount(): number;
    removePatch(id: string): boolean;
}
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