diff --git a/GamecraftModdingAPI/Block.cs b/GamecraftModdingAPI/Block.cs
index 862db3f..33a1623 100644
--- a/GamecraftModdingAPI/Block.cs
+++ b/GamecraftModdingAPI/Block.cs
@@ -240,6 +240,8 @@ namespace GamecraftModdingAPI
 			set
 			{
 				MovementEngine.MoveBlock(Id, InitData, value);
+				if (blockGroup != null)
+					blockGroup.PosAndRotCalculated = false;
 			}
 		}
 
@@ -252,6 +254,8 @@ namespace GamecraftModdingAPI
 			set
 			{
 				RotationEngine.RotateBlock(Id, InitData, value);
+				if (blockGroup != null)
+					blockGroup.PosAndRotCalculated = false;
 			}
 		}
 
@@ -354,15 +358,31 @@ namespace GamecraftModdingAPI
 			}
 		}
 
+		private BlockGroup blockGroup;
 		/// <summary>
 		/// Returns the block group this block is a part of. Block groups can be placed using blueprints.
-		/// Returns null if not part of a group.
+		/// Returns null if not part of a group.<br />
+		/// Setting the group after the block has been initialized will not update everything properly.
+		/// You should only set this property on blocks newly placed by your code.
 		/// </summary>
 		public BlockGroup BlockGroup
 		{
-			get => BlockEngine.GetBlockInfo(this,
-				(BlockGroupEntityComponent bgec) =>
-					bgec.currentBlockGroup == -1 ? null : new BlockGroup(bgec.currentBlockGroup, this));
+			get
+			{
+				if (blockGroup != null) return blockGroup;
+				return blockGroup = BlockEngine.GetBlockInfo(this,
+					(BlockGroupEntityComponent bgec) =>
+						bgec.currentBlockGroup == -1 ? null : new BlockGroup(bgec.currentBlockGroup, this));
+			}
+			set
+			{
+				blockGroup?.RemoveInternal(this);
+				BlockEngine.SetBlockInfo(this,
+					(ref BlockGroupEntityComponent bgec, BlockGroup val) => bgec.currentBlockGroup = val?.Id ?? -1,
+					value);
+				value?.AddInternal(this);
+				blockGroup = value;
+			}
 		}
 
 		/// <summary>
diff --git a/GamecraftModdingAPI/BlockGroup.cs b/GamecraftModdingAPI/BlockGroup.cs
index 8d9e761..d660236 100644
--- a/GamecraftModdingAPI/BlockGroup.cs
+++ b/GamecraftModdingAPI/BlockGroup.cs
@@ -1,4 +1,8 @@
-using Gamecraft.Blocks.BlockGroups;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using Gamecraft.Blocks.BlockGroups;
 using Unity.Mathematics;
 using UnityEngine;
 
@@ -10,11 +14,14 @@ namespace GamecraftModdingAPI
     /// <summary>
     /// A group of blocks that can be selected together. The placed version of blueprints.
     /// </summary>
-    public class BlockGroup
+    public class BlockGroup : ICollection<Block>
     {
         internal static BlueprintEngine _engine = new BlueprintEngine();
         public int Id { get; }
         private readonly Block sourceBlock;
+        private readonly List<Block> blocks;
+        private float3 position, rotation;
+        internal bool PosAndRotCalculated;
 
         internal BlockGroup(int id, Block block)
         {
@@ -22,41 +29,155 @@ namespace GamecraftModdingAPI
                 throw new BlockException("Cannot create a block group for blocks without a group!");
             Id = id;
             sourceBlock = block;
+            blocks = new List<Block>(GetBlocks());
         }
         
         /// <summary>
-        /// The position of the block group. Calculated when GetBlocks() is used.
+        /// The position of the block group (center). Recalculated if blocks have been added/removed since the last query.
         /// </summary>
-        public float3 Position { get; private set; }
-        
+        public float3 Position
+        {
+            get
+            {
+                if (!PosAndRotCalculated)
+                    Refresh();
+                return position;
+            }
+            set
+            {
+                var diff = value - position;
+                foreach (var block in blocks)
+                    block.Position += diff;
+                if (!PosAndRotCalculated) //The condition can only be true if a block has been added/removed manually
+                    Refresh(); //So the blocks array is up to date
+                else
+                    position += diff;
+            }
+        }
+
         /// <summary>
-        /// The rotation of the block group. Calculated when GetBlocks() is used.
+        /// The rotation of the block group. Recalculated if blocks have been added/removed since the last query.
         /// </summary>
-        public float3 Rotation { get; private set; }
+        public float3 Rotation
+        {
+            get
+            {
+                if (!PosAndRotCalculated)
+                    Refresh();
+                return rotation;
+            }
+            set
+            {
+                var diff = value - rotation;
+                var qdiff = Quaternion.Euler(diff);
+                foreach (var block in blocks)
+                {
+                    block.Rotation += diff;
+                    block.Position = qdiff * block.Position;
+                }
+                if (!PosAndRotCalculated)
+                    Refresh();
+                else
+                    rotation += diff;
+            }
+        }
+
+        /*/// <summary>
+        /// Removes all of the blocks in this group from the world.
+        /// </summary>
+        public void RemoveBlocks()
+        {
+            _engine.RemoveBlockGroup(Id); - TODO: Causes a hard crash
+        }*/
+
+        /// <summary>
+        /// Creates a new block group consisting of a single block.
+        /// You can add more blocks using the Add() method or by setting the BlockGroup property of the blocks.<br />
+        /// Note that only newly placed blocks should be added to groups.
+        /// </summary>
+        /// <param name="block">The block to add</param>
+        /// <returns>A new block group containing the given block</returns>
+        public static BlockGroup Create(Block block)
+        {
+            return new BlockGroup(_engine.CreateBlockGroup(default, default), block);
+        }
 
         /// <summary>
         /// Collects each block that is a part of this group. Also sets the position and rotation.
         /// </summary>
         /// <returns>An array of blocks</returns>
-        public Block[] GetBlocks()
+        private Block[] GetBlocks()
         {
+            if (!sourceBlock.Exists) return new[] {sourceBlock}; //The block must exist to get the others
             var ret = _engine.GetBlocksFromGroup(sourceBlock.Id, out var pos, out var rot);
-            Position = pos;
-            Rotation = ((Quaternion) rot).eulerAngles;
+            position = pos;
+            rotation = ((Quaternion) rot).eulerAngles;
+            PosAndRotCalculated = true;
             return ret;
         }
 
-        /// <summary>
-        /// Removes all of the blocks in this group from the world.
-        /// </summary>
-        public void Remove()
+        private void Refresh()
         {
-            _engine.RemoveBlockGroup(Id);
+            blocks.Clear();
+            blocks.AddRange(GetBlocks());
         }
 
-        public static void Init()
+        internal static void Init()
         {
             GameEngineManager.AddGameEngine(_engine);
         }
+
+        public IEnumerator<Block> GetEnumerator() => blocks.GetEnumerator();
+        IEnumerator IEnumerable.GetEnumerator() => blocks.GetEnumerator();
+
+        /// <summary>
+        /// Adds a block to the group. You should only add newly placed blocks
+        /// so that the game initializes the group membership properly.
+        /// </summary>
+        /// <param name="item"></param>
+        /// <exception cref="NullReferenceException"></exception>
+        public void Add(Block item)
+        {
+            if (item == null) throw new NullReferenceException("Cannot add null to a block group");
+            item.BlockGroup = this; //Calls AddInternal
+        }
+
+        internal void AddInternal(Block item) => blocks.Add(item);
+
+        /// <summary>
+        /// Removes all blocks from this group.
+        /// You should not remove blocks that have been initialized, only those that you placed recently.
+        /// </summary>
+        public void Clear()
+        {
+            while (blocks.Count > 0)
+                Remove(blocks[blocks.Count - 1]);
+        }
+
+        public bool Contains(Block item) => blocks.Contains(item);
+        public void CopyTo(Block[] array, int arrayIndex) => blocks.CopyTo(array, arrayIndex);
+
+        /// <summary>
+        /// Removes a block from this group.
+        /// You should not remove blocks that have been initialized, only those that you placed recently.
+        /// </summary>
+        /// <param name="item"></param>
+        /// <returns></returns>
+        /// <exception cref="NullReferenceException"></exception>
+        public bool Remove(Block item)
+        {
+            if (item == null) throw new NullReferenceException("Cannot remove null from a block group");
+            bool ret = item.BlockGroup == this;
+            if (ret)
+                item.BlockGroup = null; //Calls RemoveInternal
+            return ret;
+        }
+
+        internal void RemoveInternal(Block item) => blocks.Remove(item);
+
+        public int Count => blocks.Count;
+        public bool IsReadOnly { get; } = false;
+
+        public Block this[int index] => blocks[index]; //Setting is not supported, since the order doesn't matter
     }
 }
\ No newline at end of file
diff --git a/GamecraftModdingAPI/Blocks/BlockEventsEngine.cs b/GamecraftModdingAPI/Blocks/BlockEventsEngine.cs
index 1e5ce21..d1c2639 100644
--- a/GamecraftModdingAPI/Blocks/BlockEventsEngine.cs
+++ b/GamecraftModdingAPI/Blocks/BlockEventsEngine.cs
@@ -5,10 +5,11 @@ using Svelto.ECS;
 
 using GamecraftModdingAPI.Engines;
 using GamecraftModdingAPI.Utility;
+using RobocraftX.Blocks;
 
 namespace GamecraftModdingAPI.Blocks
 {
-    public class BlockEventsEngine : IReactionaryEngine<DBEntityStruct>
+    public class BlockEventsEngine : IReactionaryEngine<BlockTagEntityStruct>
     {
         public event EventHandler<BlockPlacedRemovedEventArgs> Placed;
         public event EventHandler<BlockPlacedRemovedEventArgs> Removed;
@@ -27,20 +28,20 @@ namespace GamecraftModdingAPI.Blocks
         public bool isRemovable { get; } = false;
 
         private bool shouldAddRemove;
-        public void Add(ref DBEntityStruct entityComponent, EGID egid)
+        public void Add(ref BlockTagEntityStruct entityComponent, EGID egid)
         {
             if (!(shouldAddRemove = !shouldAddRemove))
                 return;
             ExceptionUtil.InvokeEvent(Placed, this,
-                new BlockPlacedRemovedEventArgs {ID = egid, Type = (BlockIDs) entityComponent.DBID});
+                new BlockPlacedRemovedEventArgs {ID = egid});
         }
 
-        public void Remove(ref DBEntityStruct entityComponent, EGID egid)
+        public void Remove(ref BlockTagEntityStruct entityComponent, EGID egid)
         {
             if (!(shouldAddRemove = !shouldAddRemove))
                 return;
             ExceptionUtil.InvokeEvent(Removed, this,
-                new BlockPlacedRemovedEventArgs {ID = egid, Type = (BlockIDs) entityComponent.DBID});
+                new BlockPlacedRemovedEventArgs {ID = egid});
         }
     }
 
diff --git a/GamecraftModdingAPI/Blocks/BlueprintEngine.cs b/GamecraftModdingAPI/Blocks/BlueprintEngine.cs
index 4104ae6..e46ad50 100644
--- a/GamecraftModdingAPI/Blocks/BlueprintEngine.cs
+++ b/GamecraftModdingAPI/Blocks/BlueprintEngine.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Reflection;
 using Gamecraft.Blocks.BlockGroups;
 using Gamecraft.GUI.Blueprints;
@@ -21,7 +22,7 @@ using Allocator = Svelto.Common.Allocator;
 
 namespace GamecraftModdingAPI.Blocks
 {
-    public class BlueprintEngine : IApiEngine
+    public class BlueprintEngine : IFactoryEngine
     {
         private readonly MethodInfo getBlocksFromGroup =
             AccessTools.Method("RobocraftX.CR.MachineEditing.PlaceBlockUtility:GetBlocksSharingBlockgroup");
@@ -77,12 +78,29 @@ namespace GamecraftModdingAPI.Blocks
                 connectionFactory, default).Complete();
         }
 
+        public int CreateBlockGroup(float3 position, quaternion rotation)
+        {
+            int nextFilterId = BlockGroupUtility.NextFilterId;
+            Factory.BuildEntity<BlockGroupEntityDescriptor>((uint) nextFilterId,
+                BlockGroupExclusiveGroups.BlockGroupEntityGroup).Init(new BlockGroupTransformEntityComponent
+            {
+                blockGroupGridRotation = rotation,
+                blockGroupGridPosition = position
+            });
+            return nextFilterId;
+        }
+
         public void SelectBlueprint(uint resourceID)
         {
-            BlueprintUtil.SelectBlueprint(null, new BlueprintInventoryItemEntityStruct
+            if (resourceID == uint.MaxValue)
+                BlueprintUtil.UnselectBlueprint(entitiesDB);
+            else
             {
-                blueprintResourceId = resourceID,
-            });
+                BlueprintUtil.SelectBlueprint(entitiesDB, new BlueprintInventoryItemEntityStruct
+                {
+                    blueprintResourceId = resourceID,
+                });
+            }
         }
 
         public uint CreateBlueprint()
@@ -91,28 +109,27 @@ namespace GamecraftModdingAPI.Blocks
             return index;
         }
         
-        public void ReplaceBlueprint(uint playerID, uint blueprintID, Block[] selected, float3 pos, quaternion rot)
+        public void ReplaceBlueprint(uint playerID, uint blueprintID, ICollection<Block> selected, float3 pos, quaternion rot)
         {
-            var blockIDs = new EGID[selected.Length];
-            for (var i = 0; i < selected.Length; i++)
+            var blockIDs = new EGID[selected.Count];
+            using (var enumerator = selected.GetEnumerator())
             {
-                var block = selected[i];
-                blockIDs[i] = block.Id;
+                for (var i = 0; enumerator.MoveNext(); i++)
+                {
+                    var block = enumerator.Current;
+                    blockIDs[i] = block.Id;
+                }
             }
 
             var serializationData = clipboardManager.GetSerializationData(blueprintID);
             SelectionSerializationUtility.ClearClipboard(playerID, entitiesDB, entityFunctions, serializationData.blueprintData);
-            if (selected.Length == 0)
+            if (selected.Count == 0)
                 return;
             //ref BlockGroupTransformEntityComponent groupTransform = ref EntityNativeDBExtensions.QueryEntity<BlockGroupTransformEntityComponent>(entitiesDb, (uint) local1.currentBlockGroup, BlockGroupExclusiveGroups.BlockGroupEntityGroup);
             //ref ColliderAabb collider = ref EntityNativeDBExtensions.QueryEntity<ColliderAabb>(entitiesDB, (uint) groupID, BlockGroupExclusiveGroups.BlockGroupEntityGroup);
             //float3 bottomOffset = PlaceBlockUtility.GetBottomOffset(collider);
             //var rootPosition = math.mul(groupTransform.blockGroupGridRotation, bottomOffset) + groupTransform.blockGroupGridPosition;
             //var rootRotation = groupTransform.blockGroupGridRotation;
-            if (math.all(pos == default))
-                pos = selected[0].Position;
-            if (math.all(rot.value == default))
-                rot = Quaternion.Euler(selected[0].Rotation);
             
             clipboardManager.SetGhostSerialized(blueprintID, false);
             SelectionSerializationUtility.CopySelectionToClipboard(playerID, entitiesDB,
@@ -189,7 +206,7 @@ namespace GamecraftModdingAPI.Blocks
         }
 
         public string Name { get; } = "GamecraftModdingAPIBlueprintGameEngine";
-        public bool isRemovable { get; }
+        public bool isRemovable { get; } = false;
 
         [HarmonyPatch]
         private static class RemoveEnginePatch
@@ -225,5 +242,7 @@ namespace GamecraftModdingAPI.Blocks
                 return AccessTools.GetDeclaredConstructors(AccessTools.TypeByName("RobocraftX.CR.MachineEditing.SelectBlockEngine"))[0];
             }
         }
+
+        public IEntityFactory Factory { get; set; }
     }
 }
\ No newline at end of file
diff --git a/GamecraftModdingAPI/Blocks/PlacementEngine.cs b/GamecraftModdingAPI/Blocks/PlacementEngine.cs
index cf9a80f..5357e7f 100644
--- a/GamecraftModdingAPI/Blocks/PlacementEngine.cs
+++ b/GamecraftModdingAPI/Blocks/PlacementEngine.cs
@@ -53,15 +53,15 @@ namespace GamecraftModdingAPI.Blocks
         private EntityComponentInitializer BuildBlock(ushort block, byte color, float3 position, int uscale, float3 scale, float3 rot, uint playerId)
         {
             if (_blockEntityFactory == null)
-                throw new Exception("The factory is null.");
+                throw new BlockException("The factory is null.");
             if (uscale < 1)
-                throw new Exception("Scale needs to be at least 1");
+                throw new BlockException("Scale needs to be at least 1");
             if (scale.x < 4e-5) scale.x = uscale;
             if (scale.y < 4e-5) scale.y = uscale;
             if (scale.z < 4e-5) scale.z = uscale;
             uint dbid = block;
-            if (!PrefabsID.DBIDMAP.ContainsKey(dbid))
-                throw new Exception("Block with ID " + dbid + " not found!");
+            if (!PrefabsID.HasPrefabRegistered(dbid, 0))
+                throw new BlockException("Block with ID " + dbid + " not found!");
             //RobocraftX.CR.MachineEditing.PlaceBlockEngine
             ScalingEntityStruct scaling = new ScalingEntityStruct {scale = scale};
             Quaternion rotQ = Quaternion.Euler(rot);
diff --git a/GamecraftModdingAPI/Blueprint.cs b/GamecraftModdingAPI/Blueprint.cs
index 26876f6..458c56c 100644
--- a/GamecraftModdingAPI/Blueprint.cs
+++ b/GamecraftModdingAPI/Blueprint.cs
@@ -1,5 +1,6 @@
 using System;
 using Unity.Mathematics;
+using UnityEngine;
 
 namespace GamecraftModdingAPI
 {
@@ -35,16 +36,27 @@ namespace GamecraftModdingAPI
 
         /// <summary>
         /// Set the blocks that the blueprint contains.
+        /// Use the BlockGroup overload for automatically calculated position and rotation.
         /// </summary>
         /// <param name="blocks">The array of blocks to use</param>
         /// <param name="position">The anchor position of the blueprint</param>
-        /// <param name="rotation">The rotation of the blueprint</param>
-        public void SetStoredBlocks(Block[] blocks, float3 position = default, float3 rotation = default)
+        /// <param name="rotation">The base rotation of the blueprint</param>
+        public void StoreBlocks(Block[] blocks, float3 position, float3 rotation)
         {
             BlockGroup._engine.ReplaceBlueprint(Player.LocalPlayer.Id, Id, blocks, position,
                 quaternion.Euler(rotation));
         }
 
+        /// <summary>
+        /// Store the blocks from the given group in the blueprint with correct position and rotation for the blueprint.
+        /// </summary>
+        /// <param name="group">The block group to store</param>
+        public void StoreBlocks(BlockGroup group)
+        {
+            BlockGroup._engine.ReplaceBlueprint(Player.LocalPlayer.Id, Id, group, group.Position,
+                Quaternion.Euler(group.Rotation));
+        }
+
         /// <summary>
         /// Places the blocks the blueprint contains at the specified position and rotation.
         /// </summary>
diff --git a/GamecraftModdingAPI/Player.cs b/GamecraftModdingAPI/Player.cs
index a4b7064..14892a3 100644
--- a/GamecraftModdingAPI/Player.cs
+++ b/GamecraftModdingAPI/Player.cs
@@ -1,5 +1,5 @@
 using System;
-
+using Gamecraft.GUI.Blueprints;
 using Unity.Mathematics;
 using RobocraftX.Common;
 using RobocraftX.Common.Players;
@@ -343,6 +343,17 @@ namespace GamecraftModdingAPI
             }
         }
 
+		/// <summary>
+		/// The player's selected blueprint in their hand. Set to null to clear. Dispose after usage.
+		/// </summary>
+		public Blueprint SelectedBlueprint
+		{
+			get => playerEngine.GetPlayerStruct(Id, out BlueprintInventoryItemEntityStruct biies)
+				? new Blueprint(biies.blueprintResourceId)
+				: null;
+			set => BlockGroup._engine.SelectBlueprint(value?.Id ?? uint.MaxValue);
+		}
+
         // object methods
 
         /// <summary>
diff --git a/GamecraftModdingAPI/Tests/GamecraftModdingAPIPluginTest.cs b/GamecraftModdingAPI/Tests/GamecraftModdingAPIPluginTest.cs
index f0334aa..fb806ea 100644
--- a/GamecraftModdingAPI/Tests/GamecraftModdingAPIPluginTest.cs
+++ b/GamecraftModdingAPI/Tests/GamecraftModdingAPIPluginTest.cs
@@ -1,24 +1,29 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection;
+using System.Reflection.Emit;
 using System.Text;
 
 using HarmonyLib;
 using IllusionInjector;
 // test
+using GPUInstancer;
 using Svelto.ECS;
 using RobocraftX.Blocks;
 using RobocraftX.Common;
 using RobocraftX.SimulationModeState;
 using RobocraftX.FrontEnd;
 using Unity.Mathematics;
+using UnityEngine;
 
 using GamecraftModdingAPI.Commands;
 using GamecraftModdingAPI.Events;
 using GamecraftModdingAPI.Utility;
 using GamecraftModdingAPI.Blocks;
 using GamecraftModdingAPI.Players;
+using EventType = GamecraftModdingAPI.Events.EventType;
 
 namespace GamecraftModdingAPI.Tests
 {
@@ -269,6 +274,20 @@ namespace GamecraftModdingAPI.Tests
 						Logging.CommandLog("Health set to: " + val);
 					}).Build();
 
+				CommandBuilder.Builder("placeBlockGroup", "Places some blocks in a group")
+					.Action((float x, float y, float z) =>
+					{
+						var pos = new float3(x, y, z);
+						var group = BlockGroup.Create(Block.PlaceNew(BlockIDs.AluminiumCube, pos,
+							color: BlockColors.Aqua));
+						Block.PlaceNew(BlockIDs.AluminiumCube, pos += new float3(1, 0, 0), color: BlockColors.Blue)
+							.BlockGroup = group;
+						Block.PlaceNew(BlockIDs.AluminiumCube, pos += new float3(1, 0, 0), color: BlockColors.Green)
+							.BlockGroup = group;
+						Block.PlaceNew(BlockIDs.AluminiumCube, pos += new float3(1, 0, 0), color: BlockColors.Lime)
+							.BlockGroup = group;
+					}).Build();
+
 				GameClient.SetDebugInfo("InstalledMods", InstalledMods);
 				Block.Placed += (sender, args) =>
 					Logging.MetaDebugLog("Placed block " + args.Type + " with ID " + args.ID);
@@ -391,6 +410,88 @@ namespace GamecraftModdingAPI.Tests
 		        return ((Action) MinimumSpecsCheck.CheckRequirementsMet).Method;
 	        }
         }
+
+        [HarmonyPatch]
+        public class BugHuntPatch
+        {
+	        public static MethodInfo method =
+		        SymbolExtensions.GetMethodInfo<string>(str => Console.WriteLine(str));
+	        
+	        public static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions)
+	        {
+		        int i = 0;
+		        foreach (var instruction in instructions)
+		        {
+			        i++;
+			        yield return instruction; //Return the instruction first
+			        //stloc, dup, callvirt
+			        if (instruction.opcode.Name.ToLower().StartsWith("stloc")
+			            || instruction.opcode == OpCodes.Dup
+			            || instruction.opcode == OpCodes.Callvirt)
+			        {
+				        yield return new CodeInstruction(OpCodes.Ldstr,
+					        "Just ran the " + i + ". instruction ending with " + instruction.opcode.Name);
+				        yield return new CodeInstruction(OpCodes.Call, method);
+			        }
+		        }
+	        }
+
+	        public static MethodInfo TargetMethod()
+	        {
+		        return AccessTools.Method("RobocraftX.CR.MachineEditing.BoxSelect.CopySelectionEngine:GenerateThumbnail");
+	        }
+        }
+
+        [HarmonyPatch]
+        public class BugHuntPatch2
+        {
+	        public static void Prefix(int width, float fieldOfView, Vector3 cameraDirection, Vector3 lightDirection)
+	        {
+		        Console.WriteLine("TakeThumbnail invoked with parameters: " + width + ", " + fieldOfView + ", " +
+		                          cameraDirection + ", " + lightDirection);
+		        
+		        GPUInstancerManager manager = GPUInstancerAPI.GetActiveManagers().Find(m => m is GPUInstancerPrefabManager);
+		        Bounds instancesBounds = manager.ComputeInstancesBounds(2);
+		        Console.WriteLine("Bounds: " + instancesBounds);
+		        Console.WriteLine("Size: " + instancesBounds.size);
+		        Console.WriteLine("Size.x < 0: " + (instancesBounds.size.x < 0));
+	        }
+
+	        public static void Postfix(Texture2D __result)
+	        {
+		        Console.WriteLine("TakeThumbnail returned: " + (__result == null ? null : __result.name));
+	        }
+
+	        private delegate Texture2D TakeThumbnailDel(int width, float fieldOfView, Vector3 cameraDirection,
+		        Vector3 lightDirection);
+
+	        public static MethodInfo TargetMethod()
+	        {
+		        return ((TakeThumbnailDel) ThumbnailUtility.TakeThumbnail).Method;
+	        }
+        }
+
+        [HarmonyPatch]
+        public class BugHuntPatch3
+        {
+	        public static void Prefix(int width, int filterLayerMask, GPUInstancerManager manager,
+		        Vector3 cameraPosition, Quaternion cameraRotation, float cameraFov, Vector3 lightDirection,
+		        int cullingLayer)
+	        {
+		        Console.WriteLine("Inner TakeThumbnail invoked with parameters: " + width + ", " + filterLayerMask +
+		                          ", " + (manager != null ? manager.name : null) + ", " + cameraPosition + ", " +
+		                          cameraRotation + ", " + cameraFov + ", " + lightDirection + ", " + cullingLayer);
+	        }
+
+	        private delegate Texture2D TakeThumbnailDel(int width, int filterLayerMask, GPUInstancerManager manager,
+		        Vector3 cameraPosition, Quaternion cameraRotation, float cameraFov, Vector3 lightDirection,
+		        int cullingLayer);
+
+	        public static MethodInfo TargetMethod()
+	        {
+		        return ((TakeThumbnailDel) ThumbnailUtility.TakeThumbnail).Method;
+	        }
+        }
     }
 #endif
 }