Unity Physics (Rigidbody / PhysX) Make objects move, collide, and detect each other with Unity 6.3 LTS's built-in 3D physics (PhysX). Get the discipline, trigger-vs-collision rules, and collision layers right. Targets Unity 6.3 LTS (6000.3) . Unity 6 renames: → , → , → . The old names still compile in 6.3 LTS but are obsolete (warnings; the API Updater offers the rename), so write the new names. → is a hard compile error in old code. When to use - Use when giving an object physical motion (forces, velocity, gravity), responding to collisions or triggers, setting up collision layers/masks, ray…