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Source/Engine/Physics/Collisions.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Delegate.h"
+#include "Engine/Core/Math/Vector3.h"
+
+class PhysicsColliderActor;
+class Joint;
+class Rigidbody;
+class Collider;
+
+/// <summary>
+/// Contains a contact point data for the collision location.
+/// </summary>
+API_STRUCT() struct FLAXENGINE_API ContactPoint
+{
+DECLARE_SCRIPTING_TYPE_MINIMAL(ContactPoint);
+
+    /// <summary>
+    /// The contact point location in the world space.
+    /// </summary>
+    API_FIELD() Vector3 Point;
+
+    /// <summary>
+    /// The separation value (negative implies penetration).
+    /// </summary>
+    API_FIELD() float Separation;
+
+    /// <summary>
+    /// The contact normal.
+    /// </summary>
+    API_FIELD() Vector3 Normal;
+};
+
+template<>
+struct TIsPODType<ContactPoint>
+{
+    enum { Value = true };
+};
+
+// The maximum amount of the contact points to be stored within a single collision data (higher amount will be skipped).
+#define COLLISION_NAX_CONTACT_POINTS 8
+
+/// <summary>
+/// Contains a collision information passed to the OnCollisionEnter/OnCollisionExit events.
+/// </summary>
+API_STRUCT() struct FLAXENGINE_API Collision
+{
+DECLARE_SCRIPTING_TYPE_MINIMAL(Collision);
+
+    /// <summary>
+    /// The first collider (this instance).
+    /// </summary>
+    API_FIELD() PhysicsColliderActor* ThisActor;
+
+    /// <summary>
+    /// The second collider (other instance).
+    /// </summary>
+    API_FIELD() PhysicsColliderActor* OtherActor;
+
+    /// <summary>
+    /// The total impulse applied to this contact pair to resolve the collision.
+    /// </summary>
+    /// <remarks>
+    /// The total impulse is obtained by summing up impulses applied at all contact points in this collision pair.
+    /// </remarks>
+    API_FIELD() Vector3 Impulse;
+
+    /// <summary>
+    /// The linear velocity of the first colliding object (this instance).
+    /// </summary>
+    API_FIELD() Vector3 ThisVelocity;
+
+    /// <summary>
+    /// The linear velocity of the second colliding object (other instance).
+    /// </summary>
+    API_FIELD() Vector3 OtherVelocity;
+
+    /// <summary>
+    /// The amount of valid contact points (less or equal to COLLISION_NAX_CONTACT_POINTS).
+    /// </summary>
+    API_FIELD() int32 ContactsCount;
+
+    /// <summary>
+    /// The contacts locations.
+    /// </summary>
+    API_FIELD(Private, NoArray) ContactPoint Contacts[COLLISION_NAX_CONTACT_POINTS];
+
+public:
+
+    /// <summary>
+    /// Gets the relative linear velocity of the two colliding objects.
+    /// </summary>
+    /// <remarks>
+    /// Can be used to detect stronger collisions.
+    /// </remarks>
+    Vector3 GetRelativeVelocity() const
+    {
+        return ThisVelocity - OtherVelocity;
+    }
+
+    /// <summary>
+    /// Swaps the colliding objects (swaps A with B).
+    /// </summary>
+    void SwapObjects()
+    {
+        Swap(ThisActor, OtherActor);
+        Swap(ThisVelocity, OtherVelocity);
+    }
+};