first commit

NitroxServer/Communication/Packets/Processors/EntitySpawnedByClientProcessor.cs

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+using NitroxModel.DataStructures;
+using NitroxModel.DataStructures.GameLogic;
+using NitroxModel.DataStructures.GameLogic.Entities;
+using NitroxModel.Packets;
+using NitroxServer.Communication.Packets.Processors.Abstract;
+using NitroxServer.GameLogic;
+using NitroxServer.GameLogic.Entities;
+
+namespace NitroxServer.Communication.Packets.Processors
+{
+    class EntitySpawnedByClientProcessor : AuthenticatedPacketProcessor<EntitySpawnedByClient>
+    {
+        private readonly PlayerManager playerManager;
+        private readonly EntityRegistry entityRegistry;
+        private readonly WorldEntityManager worldEntityManager;
+        private readonly EntitySimulation entitySimulation;
+
+        public EntitySpawnedByClientProcessor(PlayerManager playerManager, EntityRegistry entityRegistry, WorldEntityManager worldEntityManager, EntitySimulation entitySimulation)
+        {
+            this.playerManager = playerManager;
+            this.entityRegistry = entityRegistry;
+            this.worldEntityManager = worldEntityManager;
+            this.entitySimulation = entitySimulation;
+        }
+
+        public override void Process(EntitySpawnedByClient packet, Player playerWhoSpawned)
+        {
+            Entity entity = packet.Entity;
+
+            // If the entity already exists in the registry, it is fine to update.  This is a normal case as the player
+            // may have an item in their inventory (that the registry knows about) then wants to spawn it into the world.
+            entityRegistry.AddOrUpdate(entity);
+
+            SimulatedEntity simulatedEntity = null;
+            if (entity is WorldEntity worldEntity)
+            {
+                worldEntityManager.TrackEntityInTheWorld(worldEntity);
+
+                if (packet.RequireSimulation)
+                {
+                    simulatedEntity = entitySimulation.AssignNewEntityToPlayer(entity, playerWhoSpawned);
+
+                    SimulationOwnershipChange ownershipChangePacket = new SimulationOwnershipChange(simulatedEntity);
+                    playerManager.SendPacketToAllPlayers(ownershipChangePacket);
+                }
+            }
+
+            SpawnEntities spawnEntities = new(entity, simulatedEntity, packet.RequireRespawn);
+            foreach (Player player in playerManager.GetConnectedPlayers())
+            {
+                bool isOtherPlayer = player != playerWhoSpawned;
+                if (isOtherPlayer && player.CanSee(entity))
+                {
+                    player.SendPacket(spawnEntities);
+                }
+            }
+        }
+    }
+}