Added a TriggerSystem, seems to work as intended.

include/Engine/Collision/Collision.h

@@ -37,6 +37,7 @@ bool RayVsModel(const Ray& ray,
 
 //Return true if the boxes are intersecting.
 bool AABBVsAABB(const AABB& a, const AABB& b);
+bool IsSameBoxProbably(const AABB& first, const AABB& second, const float epsilon = 0.0001f);
 
 }
 

include/Engine/Collision/ETrigger.h

@@ -25,7 +25,7 @@ struct TriggerLeave : Event
     EntityID Trigger;
 };
 
-/** Thrown when an entity is completely inside a trigger. */
+/** Thrown once, when an entity is completely inside a trigger. */
 struct TriggerEnter : Event
 {
     /** The id of the entity that entered the trigger. */

include/Engine/Collision/TriggerSystem.h

@@ -8,6 +8,8 @@
 #include "Core/EventBroker.h"
 #include "ETrigger.h"
 
+class AABB;
+
 class TriggerSystem : public System
 {
 public:
@@ -18,7 +20,21 @@ public:
     virtual void Update(World* world, ComponentWrapper& collision, double dt) override;
 
 private:
-    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesInTrigger;
+    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesTouchingTrigger;
+    std::unordered_map<EntityID, std::unordered_set<EntityID>> m_EntitiesCompletelyInTrigger;
+
+    bool getEntityBox(World* world, EntityID id, AABB& outBox);
+    //True if leave event was thrown.
+    bool throwLeaveIfWasInTrigger(std::unordered_set<EntityID>& triggerSet, EntityID pId, EntityID tId);
+    void attachAABBComponentFromModel(World* world, EntityID id);
+    template<typename Event>
+    void publish(EntityID pId, EntityID tId)
+    {
+        Event e;
+        e.Trigger = tId;
+        e.Entity = pId;
+        m_EventBroker->Publish(e);
+    }
 };
 
 #endif