reflect method

Vector3D reflect(
  1. Vector3D normal
)

Implementation

Vector3D reflect(Vector3D normal) {
  final dot = dotProduct(normal);
  return .vec3(
    x - (2.0*normal.x)*dot,
    y - (2.0*normal.y)*dot,
    z - (2.0*normal.z)*dot,
  );
}