method vs. Operator

gistfile1.txt

/**
  * https://github.com/jMonkeyEngine/jmonkeyengine/blob/d57c362ec3b510c1ba6356f719efa3b1576b95c6/jme3-core/src/main/java/com/jme3/math/Transform.java#L237
  */

transformVector(in, store){
  // multiply with scale first, then rotate, finally translate (cf.
  // Eberly)
  return rot.mult(store.set(in).multLocal(scale), store).addLocal(translation);
}

transformInverseVector(in, store){
  // The author of this code should look above and take the inverse of that
  // But for some reason, they didn't ..
  // in.subtract(translation, store).divideLocal(scale);
  // rot.inverse().mult(store, store);

  in.subtract(translation, store);
  rot.inverse().mult(store, store);
  store.divideLocal(scale);

  return store;
}

transformVector(in) {
  return (rot * (in * scale)) + translation;
}

transformInverseVector(in){
  return ((in - translation) * rot.inverse()) / scale);
}