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@fimbul-works/vec

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

github.com/fimbul-works/vec

fimbul-works/vec

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import { magnitude3D } from "./magnitude-3d.js"; /** * Calculates the angle between two 3D vectors. * @param {ArrayVector3D} xyz1 - First vector as `[x, y, z]` * @param {ArrayVector3D} xyz2 - Second vector as `[x, y, z]` * @param {number} [m1] - Optional first vector magnitude (default: `magnitude3D(xyz1)`) * @param {number} [m2] - Optional second vector magnitude (default: `magnitude3D(xyz2)`) * @returns {number} Angle between the vectors in radians */ export const angleBetween3D = (xyz1, xyz2, m1 = magnitude3D(xyz1), m2 = magnitude3D(xyz2)) => Math.acos((xyz1[0] * xyz2[0] + xyz1[1] * xyz2[1] + xyz1[2] * xyz2[2]) / (m1 * m2));