first commit

NitroxServer/Communication/Packets/Processors/CellVisibilityChangedProcessor.cs

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+using System.Collections.Generic;
+using NitroxModel.DataStructures;
+using NitroxModel.DataStructures.GameLogic;
+using NitroxModel.Packets;
+using NitroxServer.Communication.Packets.Processors.Abstract;
+using NitroxServer.GameLogic.Entities;
+
+namespace NitroxServer.Communication.Packets.Processors;
+
+public class CellVisibilityChangedProcessor : AuthenticatedPacketProcessor<CellVisibilityChanged>
+{
+    private readonly EntitySimulation entitySimulation;
+    private readonly WorldEntityManager worldEntityManager;
+
+    public CellVisibilityChangedProcessor(EntitySimulation entitySimulation, WorldEntityManager worldEntityManager)
+    {
+        this.entitySimulation = entitySimulation;
+        this.worldEntityManager = worldEntityManager;
+    }
+
+    public override void Process(CellVisibilityChanged packet, Player player)
+    {
+        player.AddCells(packet.Added);
+        player.RemoveCells(packet.Removed);
+
+        List<Entity> totalEntities = [];
+        List<SimulatedEntity> totalSimulationChanges = [];
+
+        foreach (AbsoluteEntityCell addedCell in packet.Added)
+        {
+            worldEntityManager.LoadUnspawnedEntities(addedCell.BatchId, false);
+
+            totalSimulationChanges.AddRange(entitySimulation.GetSimulationChangesForCell(player, addedCell));
+            totalEntities.AddRange(worldEntityManager.GetEntities(addedCell));
+        }
+
+        foreach (AbsoluteEntityCell removedCell in packet.Removed)
+        {
+            entitySimulation.FillWithRemovedCells(player, removedCell, totalSimulationChanges);
+        }
+
+        // Simulation update must be broadcasted before the entities are spawned
+        if (totalSimulationChanges.Count > 0)
+        {
+            entitySimulation.BroadcastSimulationChanges(new(totalSimulationChanges));
+        }
+
+        if (totalEntities.Count > 0)
+        {
+            SpawnEntities batchEntities = new(totalEntities);
+            player.SendPacket(batchEntities);
+        }
+    }
+}