/**
 * Perlin Noise Implementation
 *
 * Classic Perlin noise for organic texture generation.
 * Used for foliage edges, terrain variation, and natural randomness.
 *
 * Based on Ken Perlin's improved noise algorithm.
 */
export declare class PerlinNoise {
    private readonly permutation;
    private readonly p;
    constructor(seed?: number);
    private generatePermutation;
    private fade;
    private lerp;
    private grad;
    /**
     * 2D Perlin noise
     * @returns Value between -1 and 1
     */
    noise2D(x: number, y: number): number;
    /**
     * Fractal Brownian Motion (fBm) - stacked octaves of noise
     * Creates more natural, detailed textures
     *
     * @param x - X coordinate
     * @param y - Y coordinate
     * @param octaves - Number of noise layers (more = more detail)
     * @param persistence - How much each octave contributes (0.5 typical)
     * @param lacunarity - Frequency multiplier per octave (2.0 typical)
     * @returns Value roughly between -1 and 1
     */
    fbm(x: number, y: number, octaves?: number, persistence?: number, lacunarity?: number): number;
    /**
     * Ridge noise - creates sharp ridges, good for mountain silhouettes
     */
    ridgeNoise(x: number, y: number, octaves?: number, persistence?: number, lacunarity?: number): number;
    /**
     * Turbulence - absolute value noise, always positive, good for clouds/foliage
     */
    turbulence(x: number, y: number, octaves?: number, persistence?: number, lacunarity?: number): number;
}
export declare function getPerlinNoise(seed?: number): PerlinNoise;
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