utilities isOpposite.ts

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  import type Point3 from '../types/Point3';
 
/**
 * returns equal if the two vec3s are opposite within the
 * given tolerance in each dimension.
 *
 * @param v1 - The first 3 vector
 * @param v2 - The second 3 vector.
 * @param tolerance - The acceptable tolerance.
 *
 * @returns True if the two values are within the tolerance levels.
 */
export default function isOpposite(
  v1: Point3,
  v2: Point3,
  tolerance = 1e-5
): boolean {
  return (
    Math.abs(v1[0] + v2[0]) < tolerance &&
    Math.abs(v1[1] + v2[1]) < tolerance &&
    Math.abs(v1[2] + v2[2]) < tolerance
  );
}