fast-noise-lite-ts/dist/fractal/fbm.js

A fast and lightweight noise generation library for JavaScript

import { generateNoiseSingleR2, generateNoiseSingleR3 } from "../noise";
import { lerp } from "../utilities";
export function generateFractalFBmR2(options, x, y) {
    options.seed++;
    let sum = 0;
    let amp = options.fractalBounding;
    for (let i = 0; i < options.octaves; i++) {
        let noise = generateNoiseSingleR2(options, x, y);
        sum += noise * amp;
        amp *= lerp(1.0, Math.min(noise + 1, 2) * 0.5, (options.weightedStrength ?? 0.0));
        x *= options.lacunarity;
        y *= options.lacunarity;
        amp *= options.gain;
    }
    return sum;
}
export function generateFractalFBmR3(options, x, y, z) {
    options.seed++;
    let sum = 0;
    let amp = options.fractalBounding;
    for (let i = 0; i < options.octaves; i++) {
        let noise = generateNoiseSingleR3(options, x, y, z);
        sum += noise * amp;
        amp *= lerp(1.0, (noise + 1) * 0.5, (options.weightedStrength ?? 0.0));
        x *= options.lacunarity;
        y *= options.lacunarity;
        z *= options.lacunarity;
        amp *= options.gain;
    }
    return sum;
}