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NitroxServer/GameLogic/Entities/ISimulationWhitelist.cs

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+using System.Collections.Generic;
+using NitroxModel.DataStructures.GameLogic;
+
+namespace NitroxServer.GameLogic.Entities;
+
+public interface ISimulationWhitelist
+{
+    /// <summary>
+    ///     We don't want to give out simulation to all entities that the server sent out because there is a lot of stationary items and junk (TechType.None).
+    ///     It is easier to maintain a list of items we should simulate than try to blacklist items. This list should not be checked for non-server spawned items
+    ///     as they were probably dropped by the player and are mostly guaranteed to move.
+    /// </summary>
+    HashSet<NitroxTechType> MovementWhitelist { get; }
+
+    /// <summary>
+    ///     We differentiate the entities which should be simulated because of one of their behaviour (ie for utility)
+    ///     from those are simulated for their movements.
+    /// </summary>
+    HashSet<NitroxTechType> UtilityWhitelist { get; }
+}