Find the intersection point between two rays.

ray-ray-intersection.ts

/**
 * Get the intersection of two rays, with origin points p0 and p1, and direction vectors n0 and n1.
 * @param p0 The origin point of the first ray
 * @param n0 The direction vector of the first ray
 * @param p1 The origin point of the second ray
 * @param n1 The direction vector of the second ray
 * @returns 
 */
export function getRayRayIntesection(
  p0: number[],
  n0: number[],
  p1: number[],
  n1: number[]
) {
  const p0e = [p0[0] + n0[0], p0[1] + n0[1]],
    p1e = [p1[0] + n1[0], p1[1] + n1[1]],
    m0 = (p0e[1] - p0[1]) / (p0e[0] - p0[0]),
    m1 = (p1e[1] - p1[1]) / (p1e[0] - p1[0]),
    b0 = p0[1] - m0 * p0[0],
    b1 = p1[1] - m1 * p1[0],
    x = (b1 - b0) / (m0 - m1),
    y = m0 * x + b0

  return [x, y]
}