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

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

import { dot4D } from "./dot-4d.js";
/**
 * Reflects a 4D vector across a normal vector.
 * The normal vector should be normalized (unit length).
 * @param {ArrayVector4D} xyzw - Vector as `[x, y, z, w]`
 * @param {ArrayVector4D} normal - Normal vector (must be normalized)
 * @returns {ArrayVector4D} The reflected vector
 */
export const reflect4D = (xyzw, normal) => {
    const dot = dot4D(xyzw, normal);
    return [
        xyzw[0] - 2 * dot * normal[0],
        xyzw[1] - 2 * dot * normal[1],
        xyzw[2] - 2 * dot * normal[2],
        xyzw[3] - 2 * dot * normal[3],
    ];
};