Physics engine:
Unity has a built-in physics engine, such as Unity Physics and Unity Physics 2D, which can realize collision detection by adding rigid body components and collision body components to objects.
The physics engine uses physics simulation and collision detection algorithms to handle physical interactions between objects, collision responses, and mechanical effects.
The physics engine is suitable for scenes that require real physics simulation and dynamic interaction, but has high performance requirements.
Triggers and colliders:
Trigger (Trigger) and Collider (Collider) in Unity are components used to implement collision detection.
By adding colliders to objects and setting the corresponding collider properties and trigger properties, you can detect collisions between objects and trigger events.
Colliders and triggers are suitable for scenarios that require discrete collision detection and trigger events, such as collecting items, triggering plots, etc.
Radiographic inspection:
Ray detection implements collision detection by emitting a ray to detect whether it intersects with an object.
Unity provides ray detection methods, such as Physics.Raycast and Physics2D.Raycast, which can return the result of the intersection of the ray and the object. Ray detection is suitable for scenarios that require accurate detection of collisions between objects, detection of clicks, and aiming.
Custom algorithm:
Implement collision detection using custom algorithms, for example, bounding box-based collision detection, separating axis theorem, etc.