import * as THREE from 'three';
import { BaseScatterSystem, BaseScatterConfig, ChunkData } from '../core';
/**
 * Configuration for spline-based scatter
 */
export interface SplineScatterConfig extends BaseScatterConfig {
    /** Spline curve to scatter along */
    spline: THREE.CatmullRomCurve3 | THREE.CubicBezierCurve3 | THREE.QuadraticBezierCurve3;
    /** Distribution mode */
    distributionMode?: 'uniform' | 'adaptive' | 'density-based';
    /** Number of segments along spline */
    segmentCount?: number;
    /** Alternative: spacing between instances */
    spacing?: number;
    /** Tension for CatmullRom curves */
    tension?: number;
    /** Width perpendicular to spline */
    width?: number;
    /** Instances per segment for width distribution */
    distributionsPerSegment?: number;
    /** Bank angle on curves (radians) */
    bankAngle?: number;
    /** Orient along spline direction */
    followTangent?: boolean;
    /** Custom up vector */
    upVector?: THREE.Vector3;
    /** Custom offset function based on t (0-1) */
    offsetCurve?: (t: number) => number;
}
/**
 * Scatter system with advanced spline features including banking and Frenet frames
 */
export declare class SplineScatterSystem extends BaseScatterSystem {
    private spline;
    private distributionMode;
    private segmentCount;
    private spacing?;
    private tension;
    private width;
    private distributionsPerSegment;
    private bankAngle;
    private followTangent;
    private upVector;
    private offsetCurve?;
    private splinePoints;
    private splineTangents;
    private splineNormals;
    private splineBinormals;
    constructor(config: SplineScatterConfig);
    protected initializeDistribution(): Promise<void>;
    private generateSplineData;
    private generateAdaptivePoints;
    private generateDensityBasedPoints;
    private calculateFrenetFrame;
    protected updateChunks(): void;
    protected populateChunk(chunk: ChunkData, centerX: number, centerZ: number): void;
    /**
     * Update the spline and regenerate
     */
    updateSpline(spline: THREE.CatmullRomCurve3 | THREE.CubicBezierCurve3 | THREE.QuadraticBezierCurve3, segmentCount?: number): void;
    /**
     * Set the bank angle and regenerate
     */
    setBankAngle(angle: number): void;
}
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