@fimbul-works/vec/dist/esm/4d/random-4d.js

A comprehensive TypeScript vector math library providing 2D, 3D, and 4D vector operations with a focus on performance and type safety.

const { sqrt, log, sin, cos, PI } = Math;
/**
 * Creates a random unit 4D vector.
 * @param {() => number} random - A function that returns a random number between 0 and 1 (default: `Math.random`)
 * @returns {ArrayVector4D} A random unit vector
 */
export const random4D = (random = Math.random) => {
    // 1. Generate four numbers from a Normal Distribution (Box-Muller transform)
    const x = sqrt(-2 * log(random())) * cos(2 * PI * random());
    const y = sqrt(-2 * log(random())) * sin(2 * PI * random());
    const z = sqrt(-2 * log(random())) * cos(2 * PI * random());
    const w = sqrt(-2 * log(random())) * sin(2 * PI * random());
    // 2. Calculate the current length
    const length = sqrt(x * x + y * y + z * z + w * w);
    // 3. Divide by length to make it a unit vector
    return [x / length, y / length, z / length, w / length];
};