Interface to the trigger component, exposing support for tracking enter / leave events for other entities entering a predefined trigger box An in-game example that uses this functionality is the ProximityTrigger entity

#include 

// Example of a component that receives enter and leave events from a virtual box positioned on the entity
class CMyTriggerComponent : public IEntityComponent
{
public:
    virtual ~CMyTriggerComponent() = default;
    static void ReflectType(Schematyc::CTypeDesc& desc) { /* Reflect the component GUID in here. */ }

    virtual void Initialize() override
    {
        // Create a new IEntityTriggerComponent instance, responsible for registering our entity in the proximity grid
        IEntityTriggerComponent* pTriggerComponent = m_pEntity->CreateComponent();

        // Listen to area events in a 2m^3 box around the entity
        const Vec3 triggerBoxSize = Vec3(2, 2, 2);

        // Create an axis aligned bounding box, ensuring that we listen to events around the entity translation
        const AABB triggerBounds = AABB(triggerBoxSize * -0.5f, triggerBoxSize * 0.5f);
        // Now set the trigger bounds on the trigger component
        pTriggerComponent->SetTriggerBounds(triggerBounds);
    }

    virtual void ProcessEvent(const SEntityEvent& event) override
    {
        if (event.event == ENTITY_EVENT_ENTERAREA)
        {
            // Get the entity identifier of the entity that just entered our shape
            const EntityId enteredEntityId = static_cast(event.nParam[0]);
        }
        else if (event.event == ENTITY_EVENT_LEAVEAREA)
        {
            // Get the entity identifier of the entity that just left our shape
            const EntityId leftEntityId = static_cast(event.nParam[0]);
        }
    }

    virtual uint64 GetEventMask() const override
    {
        // Listen to the enter and leave events, in order to receive callbacks above when entities enter our trigger box
        return BIT64(ENTITY_EVENT_ENTERAREA) | BIT64(ENTITY_EVENT_LEAVEAREA);
    }
};