Add LongitudinalSlip/LateralSlip to wheel state

Source/Engine/Physics/Actors/WheeledVehicle.h

@@ -402,6 +402,16 @@ API_CLASS(Attributes="ActorContextMenu(\"New/Physics/Wheeled Vehicle\"), ActorTo
         /// </summary>
         API_FIELD() float SuspensionOffset = 0.0f;
 
+        /// <summary>
+        /// The longitudinal slip of the tire (frontal). Can be used to determine whether the tire is slipping or gripping the surface.
+        /// </summary>
+        API_FIELD() float LongitudinalSlip = 0.0f;
+
+        /// <summary>
+        /// The lateral slip of the tire (sideways). Can be used to determine whether the tire is slipping or gripping the surface.
+        /// </summary>
+        API_FIELD() float LateralSlip = 0.0f;
+
 #if USE_EDITOR
         /// <summary>
         /// The start location of the suspension raycast start (Editor only for debugging).

Source/Engine/Physics/PhysX/PhysicsBackendPhysX.cpp

@@ -1175,6 +1175,8 @@ void ScenePhysX::UpdateVehicles(float dt)
             state.SteerAngle = RadiansToDegrees * perWheel.steerAngle;
             state.RotationAngle = -RadiansToDegrees * drive->mWheelsDynData.getWheelRotationAngle(j);
             state.SuspensionOffset = perWheel.suspJounce;
+            state.LongitudinalSlip = perWheel.longitudinalSlip;
+            state.LateralSlip = perWheel.lateralSlip;
 #if USE_EDITOR
             state.SuspensionTraceStart = P2C(perWheel.suspLineStart) + Origin;
             state.SuspensionTraceEnd = P2C(perWheel.suspLineStart + perWheel.suspLineDir * perWheel.suspLineLength) + Origin;