detached vehicle parts should be synced

Assets/Prefabs/NetworkManager.prefab

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@@ -131,7 +132,6 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   m_serverPort: 18418
-  simulateResponding: 0
   gameServerPortNumber: 7777
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Assets/Prefabs/VehicleExplosionLeftoverPart.prefab

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Assets/Prefabs/VehicleExplosionLeftoverPart.prefab.meta

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Assets/Prefabs/VehicleManager.prefab

@@ -95,8 +95,7 @@ MonoBehaviour:
   controlInputOnLocalPlayer: 1
   controlWheelsOnLocalPlayer: 1
   vehicleSyncRate: 20
-  explosionForceMultiplier: 700
-  explosionChassisForceMultiplier: 11000
+  massToHealthExponent: 1
   explosionDamageRadius: 7
   explosionDamageOverDistanceCurve:
     serializedVersion: 2
@@ -123,6 +122,8 @@ MonoBehaviour:
     m_PostInfinity: 2
     m_RotationOrder: 4
   explosionMassToDamageExponent: 1
+  explosionLeftoverPartPrefab: {fileID: 5998353205578393877, guid: 919ee6fe912ab4940abdedd633508610,
+    type: 3}
   explosionLeftoverPartsLifetime: 30
   explosionLeftoverPartsMaxDepenetrationVelocity: 15
   explosionLeftoverPartsMass: 100

Assets/Scripts/Behaviours/Vehicles/Vehicle.cs

@@ -166,6 +166,8 @@ namespace SanAndreasUnity.Behaviours.Vehicles
         bool m_isServer => Net.NetStatus.IsServer;
         public bool IsControlledByLocalPlayer => Ped.Instance != null && Ped.Instance.CurrentVehicle == this && Ped.Instance.CurrentVehicleSeat.IsDriver;
 
+        public Mirror.NetworkIdentity NetIdentity { get; private set; }
+
         public Mirror.NetworkTransform NetTransform { get; private set; }
 
         List<Ped> m_lastPreparedPeds = new List<Ped>();
@@ -185,6 +187,7 @@ namespace SanAndreasUnity.Behaviours.Vehicles
 
         private void Awake()
         {
+            this.NetIdentity = this.GetComponentOrThrow<Mirror.NetworkIdentity>();
             this.NetTransform = this.GetComponent<Mirror.NetworkTransform>();
             _props = new MaterialPropertyBlock();
             this.Awake_Damage();

Assets/Scripts/Behaviours/Vehicles/VehicleManager.cs

@@ -27,6 +27,7 @@ namespace SanAndreasUnity.Behaviours.Vehicles
         public AnimationCurve explosionDamageOverDistanceCurve = AnimationCurve.Linear(0f, 1f, 1f, 0f);
         [Range(0.1f, 3f)] public float explosionMassToDamageExponent = 1f;
 
+        public GameObject explosionLeftoverPartPrefab;
         public float explosionLeftoverPartsLifetime = 20f;
         public float explosionLeftoverPartsMaxDepenetrationVelocity = 15f;
         public float explosionLeftoverPartsMass = 100f;

Assets/Scripts/Behaviours/Vehicles/Vehicle_Damage.cs

@@ -165,7 +165,7 @@ namespace SanAndreasUnity.Behaviours.Vehicles
                 if (!startingNames.Any(n => frame.gameObject.name.StartsWith(n)))
                     continue;
 
-                DetachFrameDuringExplosion(frame, VehicleManager.Instance.explosionLeftoverPartsMass);
+                DetachFrameDuringExplosion(frame, VehicleManager.Instance.explosionLeftoverPartsMass, null);
             }
 
             // chassis need to be handled after all other objects are detached, because chassis can sometimes
@@ -179,7 +179,7 @@ namespace SanAndreasUnity.Behaviours.Vehicles
             }
             else
             {
-                DetachFrameDuringExplosion(chassisFrame, this.HandlingData.Mass * 0.8f);
+                DetachFrameDuringExplosion(chassisFrame, this.HandlingData.Mass * 0.8f, null);
             }
 
             // inflict damage to nearby objects
@@ -206,7 +206,16 @@ namespace SanAndreasUnity.Behaviours.Vehicles
 
         }
 
-        void DetachFrameDuringExplosion(Frame frame, float mass)
+        public void DetachFrameDuringExplosion(string frameName, float mass, GameObject parentGo)
+        {
+            Frame frame = this.Frames.FirstOrDefault(f => f.gameObject.name == frameName);
+            if (null == frame)
+                Debug.LogError($"Failed to find frame by name: {frameName}");
+            else
+                DetachFrameDuringExplosion(frame, mass, parentGo);
+        }
+
+        void DetachFrameDuringExplosion(Frame frame, float mass, GameObject parentGo)
         {
             var meshFilter = frame.GetComponentInChildren<MeshFilter>();
             if (null == meshFilter)
@@ -215,8 +224,12 @@ namespace SanAndreasUnity.Behaviours.Vehicles
             if (!meshFilter.gameObject.activeInHierarchy)
                 return;
 
-            meshFilter.transform.SetParent(null, true);
-            meshFilter.gameObject.name = "vehicle_part_" + meshFilter.gameObject.name;
+            if (null == parentGo)
+                parentGo = Object.Instantiate(VehicleManager.Instance.explosionLeftoverPartPrefab, meshFilter.transform.position, meshFilter.transform.rotation);
+            
+            parentGo.name = "vehicle_part_" + meshFilter.gameObject.name;
+
+            meshFilter.transform.SetParent(parentGo.transform, true);
             meshFilter.gameObject.layer = UnityEngine.LayerMask.NameToLayer("Default");
             var meshCollider = meshFilter.gameObject.GetOrAddComponent<MeshCollider>();
             meshCollider.convex = true;
@@ -226,7 +239,15 @@ namespace SanAndreasUnity.Behaviours.Vehicles
             rigidBody.drag = 0.05f;
             rigidBody.maxDepenetrationVelocity = VehicleManager.Instance.explosionLeftoverPartsMaxDepenetrationVelocity;
             
-            Object.Destroy(meshFilter.gameObject, VehicleManager.Instance.explosionLeftoverPartsLifetime * Random.Range(0.8f, 1.2f));
+            if (NetStatus.IsServer)
+            {
+                Object.Destroy(parentGo, VehicleManager.Instance.explosionLeftoverPartsLifetime * Random.Range(0.8f, 1.2f));
+
+                var netScript = parentGo.GetComponentOrThrow<NetworkedVehicleDetachedPart>();
+                netScript.InitializeOnServer(this.NetIdentity.netId, frame.gameObject.name, mass, rigidBody);
+
+                NetManager.Spawn(parentGo);
+            }
         }
 
         void AssignExplosionSound(GameObject explosionGo)

Assets/Scripts/Networking/NetworkedVehicleDetachedPart.cs

@@ -0,0 +1,57 @@
+using Mirror;
+using SanAndreasUnity.Behaviours.Vehicles;
+using SanAndreasUnity.Utilities;
+using UnityEngine;
+
+namespace SanAndreasUnity.Net
+{
+
+    public class NetworkedVehicleDetachedPart : NetworkBehaviour
+    {
+        public NetworkRigidBody NetworkRigidBody { get; private set; }
+
+        [SyncVar] uint m_net_vehicleId;
+        [SyncVar] string m_net_frameName;
+        [SyncVar] float m_net_mass;
+
+
+        void Awake()
+        {
+            this.NetworkRigidBody = this.GetComponentOrThrow<NetworkRigidBody>();
+        }
+
+        public void InitializeOnServer(uint vehicleId, string frameName, float mass, Rigidbody rigidbody)
+        {
+            m_net_vehicleId = vehicleId;
+            m_net_frameName = frameName;
+            m_net_mass = mass;
+
+            this.NetworkRigidBody.Rigidbody = rigidbody;
+        }
+
+        public override void OnStartClient()
+        {
+            if (NetStatus.IsServer)
+                return;
+
+            F.RunExceptionSafe(() => this.OnStartClientInternal());
+        }
+
+        void OnStartClientInternal()
+        {
+            GameObject vehicleGo = NetManager.GetNetworkObjectById(m_net_vehicleId);
+            if (null == vehicleGo)
+            {
+                // this should not happen because vehicle must have been spawned before detached part
+                Debug.LogError($"Can not find vehicle object with id {m_net_vehicleId} for detached part with id {this.netId}");
+            }
+            else
+            {
+                Vehicle vehicle = vehicleGo.GetComponentOrThrow<Vehicle>();
+                vehicle.DetachFrameDuringExplosion(m_net_frameName, m_net_mass, this.gameObject);
+                this.NetworkRigidBody.Rigidbody = this.GetComponentInChildren<Rigidbody>();
+            }
+        }
+    }
+
+}

Assets/Scripts/Networking/NetworkedVehicleDetachedPart.cs.meta

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