How to detect trigger/collision without rigidbody or raycast
<p>I have two Gameobjects A and B and I want to detect the Trigger b/w them. Remember, neither I want to use <strong>Rigidbody</strong> with colliders nor <strong>Physics.Raycast</strong> due to performance reasons.</p>

<p>I don't want to use Raycast as it is Expensive and also Rigidbody cause it don't allow to differentiate that <a href="https://stackoverflow.com/questions/37782373/check-which-object-has-collide-with-another-object-while-scripts-are-same">which Object trigger the Another (like did car hit the motorcycle or motorcylce hit the car).</a></p>

<p>So my simple question, is there any third, fourth, fifth or sixth or else way available to detect Trigger without using any <strong>Raycast/Rigidbody/Collider</strong>?</p>