helios/engine/modules/physics/collision/systems/README.md File

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namespace	systems
	Collision detection and response systems. More...

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 # helios::engine::modules::physics::collision::systems

 

 Collision detection and response systems for the helios engine.

 

 This namespace contains systems for spatial partitioning, collision detection, and collision response handling. The systems are designed to run in a specific order within the game loop:

 

 1 **BoundsUpdateSystem** - Updates world-space AABB colliders from entity transforms.

 2 **GridCollisionDetectionSystem** - Performs broad-phase and narrow-phase collision detection using uniform spatial partitioning.

 3 **CollisionStateResponseSystem** - Processes collision states and issues response commands (e.g., despawn).

 4 **CollisionStateClearSystem** - Clears collision state components at frame end (post-phase).

 

 ## GridCollisionDetectionSystem

 

 Implements grid-based spatial partitioning for efficient collision detection:

 

 - **Broadphase:** Entities are inserted into grid cells based on their AABB

 - **Narrowphase:** AABB intersection tests for entities sharing the same cell

 - **Layer Filtering:** Uses layer masks for fine-grained collision pair control

 - **Hit Policy:** Supports `OneHit` (first collision only) or `All` (multi-target)

 

 ## CollisionStateResponseSystem

 

 Processes collision states and executes configured behaviors:

 

 - Reads `CollisionStateComponent` to determine collision response

 - Issues `DespawnCommand` for entities with `Despawn` behavior

 - Publishes `SolidCollisionEvent` / `TriggerCollisionEvent` for `PassEvent` behavior

 

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 <details>

 <summary>Doxygen</summary><p>

 @namespace helios::engine::modules::physics::collision::systems

 @brief Collision detection and response systems.

 @details This namespace contains systems for updating collider bounds, performing grid-based spatial partitioning for efficient broad-phase detection, processing collision responses, and clearing collision state at frame end.

 </p></details>

 

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