import * as THREE from 'three';
import { BaseScatterSystem } from '../core';
/**
 * Brush configuration
 */
export interface BrushConfig {
    /** Brush radius in world units */
    radius: number;
    /** Brush strength (0-1) */
    strength?: number;
    /** Instances per paint stroke */
    density?: number;
    /** Falloff type */
    falloff?: 'constant' | 'linear' | 'smooth';
}
/**
 * Painted instance data
 */
export interface PaintedInstance {
    id: number;
    position: THREE.Vector3;
    rotation: THREE.Euler;
    scale: THREE.Vector3;
}
/**
 * Brush tool for runtime scatter editing (paint/erase instances)
 */
export declare class ScatterBrush {
    private system;
    private paintedInstances;
    private radius;
    private strength;
    private density;
    private falloff;
    private rng;
    private nextPaintedId;
    constructor(system: BaseScatterSystem, config: BrushConfig);
    /**
     * Set brush radius
     */
    setRadius(radius: number): void;
    /**
     * Set brush strength
     */
    setStrength(strength: number): void;
    /**
     * Set brush density
     */
    setDensity(density: number): void;
    /**
     * Get falloff multiplier at distance from brush center
     */
    private getFalloff;
    /**
     * Paint instances at the given world position
     */
    paint(center: THREE.Vector3, heightProvider?: (x: number, z: number) => number): PaintedInstance[];
    /**
     * Erase instances within radius of the given position
     */
    erase(center: THREE.Vector3): number;
    /**
     * Clear all painted instances
     */
    clearAll(): void;
    /**
     * Get count of painted instances
     */
    getPaintedCount(): number;
    /**
     * Get all painted instance positions
     */
    getPaintedPositions(): THREE.Vector3[];
    /**
     * Raycast helper to find intersection point
     */
    static getIntersection(raycaster: THREE.Raycaster, surfaces: THREE.Object3D[]): THREE.Vector3 | null;
}
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