first commit

NitroxServer/Resources/IPrefabAsset.cs

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+using NitroxModel.DataStructures.Unity;
+
+namespace NitroxServer.Resources;
+
+public interface IPrefabAsset
+{
+    public NitroxTransform Transform { get; set; }
+    public string ClassId { get; }
+}

NitroxServer/Resources/PrefabPlaceholderAsset.cs

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+using System;
+using NitroxModel.DataStructures.Unity;
+using NitroxServer.GameLogic.Entities;
+
+namespace NitroxServer.Resources;
+
+[Serializable]
+/// <summary>
+/// Some PrefabPlaceholders spawn GameObjects that are always there (decor, environment ...)
+/// And some others spawn a GameObject with an EntitySlot in which case this field is not null.
+/// </summary>
+public record struct PrefabPlaceholderAsset(string ClassId, NitroxEntitySlot? EntitySlot = null, NitroxTransform Transform = null) : IPrefabAsset;

NitroxServer/Resources/PrefabPlaceholderRandomAsset.cs

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+using System.Collections.Generic;
+using NitroxModel.DataStructures.Unity;
+
+namespace NitroxServer.Resources;
+
+public record struct PrefabPlaceholderRandomAsset(List<string> ClassIds, NitroxTransform Transform = null, string ClassId = null) : IPrefabAsset
+{
+    public NitroxTransform Transform { get; set; } = Transform;
+}

NitroxServer/Resources/PrefabPlaceholdersGroupAsset.cs

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+using System;
+using NitroxModel.DataStructures.Unity;
+
+namespace NitroxServer.Resources;
+
+
+[Serializable]
+/// <param name="PrefabAssets">
+/// All attached PrefabPlaceholders (and PrefabPlaceholdersGroup). Is in sync with PrefabPlaceholdersGroup.prefabPlaceholders
+/// </param>
+public record struct PrefabPlaceholdersGroupAsset(string ClassId, IPrefabAsset[] PrefabAssets, NitroxTransform Transform = null) : IPrefabAsset;

NitroxServer/Resources/RandomSpawnSpoofer.cs

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+using System.Collections.Generic;
+using NitroxServer.Helper;
+
+namespace NitroxServer.Resources;
+
+public class RandomSpawnSpoofer
+{
+    private readonly Dictionary<string, string[]> randomPossibilitiesByClassId;
+
+    public RandomSpawnSpoofer(Dictionary<string, string[]> randomPossibilitiesByClassId)
+    {
+        this.randomPossibilitiesByClassId = randomPossibilitiesByClassId;
+    }
+
+    public void PickRandomClassIdIfRequired(ref string classId)
+    {
+        if (randomPossibilitiesByClassId.TryGetValue(classId, out string[] choices))
+        {
+            int randomIndex = XORRandom.NextIntRange(0, choices.Length);
+            classId = choices[randomIndex];
+        }
+    }
+}