Add maze generation visualization with 2-phase animation

Enhance maze generation animation system with visual feedback during algorithm execution and a two-phase rendering approach:

- Phase 1: Preview mode displays simple blocks while algorithms run, with real-time feedback for path checking (valid/invalid/evaluating states)
- Phase 2: Sweep 3D modular pieces into place with pop-in animations

Updates:
- New MazeCellHighlight states (EvaluatingValid, EvaluatingInvalid) for algorithm feedback
- Modified all maze algorithms (DFS, Kruskal's, Prim's) to emit visual feedback when checking adjacent cells
- New animation components: HighlightLinger (self-destruct highlights) and PopInAnimation (juicy pop-in effect)
- Refactored MazeReworkSpawner to support preview prefabs and track spawned object state
- New prefabs: Stair room and MazeVisualize variants
- Added stepDelay and isPreviewMode controls to MazeAnimator for flexible pacing
- Reduced default maze size and adjusted material colors for testing

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Assets/Prefabs/Environment/Room/Stair.prefab.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 4068079ff983733439d9bdddff56ea18
+PrefabImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Presets/MazeRework.asset

@@ -13,8 +13,8 @@ MonoBehaviour:
   m_Name: MazeRework
   m_EditorClassIdentifier: Assembly-CSharp::Baba_yaga.GameSetup.MazeRework.MazeReworkConfig
   algorithm: 3
-  width: 21
+  width: 10
-  depth: 21
+  depth: 10
   useRandomSeed: 1
   seed: 1337
   startLocation: {x: 1, y: 1}
@@ -22,5 +22,5 @@ MonoBehaviour:
   roomCount: 378
   minRoomSize: {x: 3, y: 3}
   maxRoomSize: {x: 5, y: 5}
-  extraRoomDoorChance: 0.3
+  extraRoomDoorChance: 1
   loopChance: 0.1

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Algorithms/DFSIterative.cs

@@ -29,8 +29,28 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
                 {
                     int nx = current.x + dx[i];
                     int nz = current.y + dz[i];
-                    if (nx > 0 && nx < width - 1 && nz > 0 && nz < depth - 1 && !visited[nx, nz])
+                    int wx = current.x + dx[i] / 2;
-                        candidates.Add(i);
+                    int wz = current.y + dz[i] / 2;
+
+                    if (nx > 0 && nx < width - 1 && nz > 0 && nz < depth - 1)
+                    {
+                        if (!visited[nx, nz])
+                        {
+                            candidates.Add(i);
+                        }
+                        else
+                        {
+                            // Checked a visited cell
+                            onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingInvalid);
+                            onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
+                        }
+                    }
+                    else
+                    {
+                        // Checked out of bounds
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingInvalid);
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
+                    }
                 }
 
                 if (candidates.Count > 0)
@@ -46,6 +66,10 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
                     visited[wx, wz]   = true;
                     visited[nx2, nz2] = true;
 
+                    // Show valid pick
+                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingValid);
+                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
+
                     // Move head off current cell
                     onCellChanged?.Invoke(current.x, current.y, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
                     

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Algorithms/DFSRecursive.cs

@@ -38,25 +38,44 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
                 int wx = cx + dx[order[i]] / 2;
                 int wz = cz + dz[order[i]] / 2;
 
-                if (nx > 0 && nx < width - 1 && nz > 0 && nz < depth - 1 && !visited[nx, nz])
+                if (nx > 0 && nx < width - 1 && nz > 0 && nz < depth - 1)
                 {
-                    grid[wx, wz] = MazeReworkCellType.Corridor;
+                    if (!visited[nx, nz])
-                    grid[nx, nz] = MazeReworkCellType.Corridor;
+                    {
-                    visited[wx, wz] = true;
+                        // Valid path found! Show valid check
-                    visited[nx, nz] = true;
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingValid);
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
 
-                    // Move head off current cell
+                        grid[wx, wz] = MazeReworkCellType.Corridor;
-                    onCellChanged?.Invoke(cx, cz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
+                        grid[nx, nz] = MazeReworkCellType.Corridor;
+                        visited[wx, wz] = true;
+                        visited[nx, nz] = true;
 
-                    // Show intermediate wall breaking with head
+                        // Move head off current cell
-                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.SearchHead);
+                        onCellChanged?.Invoke(cx, cz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
-                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
                         
-                    CarveFrom(nx, nz, grid, visited, rng, width, depth, onCellChanged);
+                        // Show intermediate wall breaking with head
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.SearchHead);
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
 
-                    // Clear head from the child cell and restore it here
+                        CarveFrom(nx, nz, grid, visited, rng, width, depth, onCellChanged);
-                    onCellChanged?.Invoke(nx, nz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
+
-                    onCellChanged?.Invoke(cx, cz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.SearchHead);
+                        // Clear head from the child cell and restore it here
+                        onCellChanged?.Invoke(nx, nz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.None);
+                        onCellChanged?.Invoke(cx, cz, MazeReworkCellType.Corridor, Animation.MazeCellHighlight.SearchHead);
+                    }
+                    else
+                    {
+                        // Invalid path (already visited)
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingInvalid);
+                        onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
+                    }
+                }
+                else
+                {
+                    // Invalid path (out of bounds)
+                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.EvaluatingInvalid);
+                    onCellChanged?.Invoke(wx, wz, MazeReworkCellType.Wall, Animation.MazeCellHighlight.None);
                 }
             }
         }

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Algorithms/Kruskals.cs

@@ -49,9 +49,13 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
 
                 // Show evaluating highlight
                 onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.Evaluating);
+                onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.None);
 
                 if (uf.Find(cellId[ax, az]) != uf.Find(cellId[bx, bz]))
                 {
+                    onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.EvaluatingValid);
+                    onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.None);
+
                     grid[wx, wz] = MazeReworkCellType.Corridor;
                     grid[ax, az] = MazeReworkCellType.Corridor;
                     grid[bx, bz] = MazeReworkCellType.Corridor;
@@ -65,7 +69,8 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
                 }
                 else
                 {
-                    // Clear evaluate highlight
+                    // Invalid
+                    onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.EvaluatingInvalid);
                     onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.None);
                 }
             }

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Algorithms/Prims.cs

@@ -31,11 +31,17 @@ namespace Baba_yaga.GameSetup.MazeRework.Algorithms
 
                 if (visited[nx, nz])
                 {
+                    onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.EvaluatingInvalid);
+                    onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.None);
+                    
                     // Clear the frontier highlight if this cell was already visited by another path
                     onCellChanged?.Invoke(nx, nz, grid[nx, nz], Animation.MazeCellHighlight.None);
                     continue;
                 }
 
+                onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.EvaluatingValid);
+                onCellChanged?.Invoke(wx, wz, grid[wx, wz], Animation.MazeCellHighlight.None);
+
                 grid[wx, wz] = MazeReworkCellType.Corridor;
                 grid[nx, nz] = MazeReworkCellType.Corridor;
                 visited[wx, wz] = true;

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/HighlightLinger.cs

@@ -0,0 +1,34 @@
+using System.Collections;
+using UnityEngine;
+
+namespace Baba_yaga.GameSetup.MazeRework.Animation
+{
+    public class HighlightLinger : MonoBehaviour
+    {
+        public float lingerTime = 0.4f;
+
+        private void Start()
+        {
+            StartCoroutine(LingerAndDie());
+        }
+
+        private IEnumerator LingerAndDie()
+        {
+            yield return new WaitForSeconds(lingerTime);
+            
+            // Optional: fade out logic could go here
+            float fadeOutTime = 0.1f;
+            float time = 0f;
+            Vector3 startScale = transform.localScale;
+
+            while (time < fadeOutTime)
+            {
+                time += Time.deltaTime;
+                transform.localScale = Vector3.Lerp(startScale, Vector3.zero, time / fadeOutTime);
+                yield return null;
+            }
+
+            Destroy(gameObject);
+        }
+    }
+}

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/HighlightLinger.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 5e88f5f0389dbd043937d08377e3168a

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/MazeAnimator.cs

@@ -7,9 +7,12 @@ namespace Baba_yaga.GameSetup.MazeRework.Animation
     public class MazeAnimator : MonoBehaviour
     {
         [Header("Animation Settings")]
-        [Tooltip("How many cell changes to process in a single frame. Higher = faster generation.")]
+        [Tooltip("How many cell changes to process in a single frame (if stepDelay is 0).")]
         [Min(1)]
-        public int cellsPerFrame = 5;
+        public int cellsPerFrame = 1; // Default to 1 so you can see it clearly!
+
+        [Tooltip("Delay in seconds between every single cell change. Set to > 0 to actually see the checking flashes!")]
+        public float stepDelay = 0.05f;
 
         [Tooltip("Extra delay (in seconds) between major generation phases (like switching from Rooms to Carving).")]
         public float delayBetweenPhases = 0.5f;
@@ -63,6 +66,7 @@ namespace Baba_yaga.GameSetup.MazeRework.Animation
             }
 
             spawner.Clear();
+            spawner.isPreviewMode = true; // Phase 1: Simple preview blocks
 
             MazeAnimationPhase currentPhase = MazeAnimationPhase.RoomPlacement;
             int processedThisFrame = 0;
@@ -80,13 +84,29 @@ namespace Baba_yaga.GameSetup.MazeRework.Animation
                 }
 
                 workingGrid[change.X, change.Z] = change.Type;
-                workingHighlights[change.X, change.Z] = change.Highlight;
+                
+                if (change.Highlight == MazeCellHighlight.EvaluatingValid || 
+                    change.Highlight == MazeCellHighlight.EvaluatingInvalid || 
+                    change.Highlight == MazeCellHighlight.Evaluating)
+                {
+                    // Linger flashes independently so they don't get erased if cellsPerFrame > 1
+                    spawner.FlashHighlight(change.Highlight, change.X, change.Z, yOffset, container);
+                }
+                else
+                {
+                    workingHighlights[change.X, change.Z] = change.Highlight;
+                }
                 
                 // Refresh the cell and its neighbors in the spawner
                 spawner.RefreshCell(workingGrid, workingHighlights, change.X, change.Z, yOffset, container);
 
                 processedThisFrame++;
-                if (processedThisFrame >= cellsPerFrame)
+                
+                if (stepDelay > 0f)
+                {
+                    yield return new WaitForSeconds(stepDelay);
+                }
+                else if (processedThisFrame >= cellsPerFrame)
                 {
                     yield return null; // Wait for next frame
                     processedThisFrame = 0;
@@ -96,21 +116,52 @@ namespace Baba_yaga.GameSetup.MazeRework.Animation
             // Wait a moment at the end before finalizing
             if (delayBetweenPhases > 0f)
             {
-                yield return new WaitForSeconds(delayBetweenPhases);
+                yield return new WaitForSeconds(delayBetweenPhases * 2f); // Extra pause to admire the 2D layout!
             }
 
-            // One final sync with finalGrid just to be absolutely safe
+            // --- Phase 2: Render 3D Map ---
+            spawner.isPreviewMode = false;
+            
+            // Sweep across the grid and spawn the heavy 3D modular pieces
             for (int z = 0; z < depth; z++)
             {
                 for (int x = 0; x < width; x++)
                 {
-                    bool gridChanged = workingGrid[x, z] != finalGrid[x, z];
+                    workingGrid[x, z] = finalGrid[x, z];
-                    bool highlightChanged = workingHighlights[x, z] != MazeCellHighlight.None;
+                    workingHighlights[x, z] = MazeCellHighlight.None;
                     
-                    if (gridChanged || highlightChanged)
+                    // Only yield when we actually spawn a piece to create a cool sweep wave!
+                    if (finalGrid[x, z] != MazeReworkCellType.Wall)
                     {
-                        workingGrid[x, z] = finalGrid[x, z];
+                        // 1. Flash an Evaluating highlight to visualize "choosing" this cell
-                        workingHighlights[x, z] = MazeCellHighlight.None;
+                        spawner.FlashHighlight(MazeCellHighlight.EvaluatingValid, x, z, yOffset, container);
+                        
+                        if (stepDelay > 0f)
+                        {
+                            yield return new WaitForSeconds(stepDelay * 0.5f); // Short pause for the check
+                        }
+                        
+                        // 2. Spawn the actual piece
+                        spawner.RefreshCell(workingGrid, workingHighlights, x, z, yOffset, container);
+                        
+                        // Wait a tiny fraction of a second to create the sweeping wave effect
+                        if (stepDelay > 0f)
+                        {
+                            yield return new WaitForSeconds(stepDelay * 0.5f); // faster than the algorithm checks
+                        }
+                        else
+                        {
+                            processedThisFrame++;
+                            if (processedThisFrame >= cellsPerFrame * 2) // Twice as fast as algorithm phase
+                            {
+                                yield return null;
+                                processedThisFrame = 0;
+                            }
+                        }
+                    }
+                    else
+                    {
+                        // Even if it's a wall, refresh it to clear the preview walls (if any)
                         spawner.RefreshCell(workingGrid, workingHighlights, x, z, yOffset, container);
                     }
                 }

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/MazeCellHighlight.cs

@@ -5,6 +5,8 @@ namespace Baba_yaga.GameSetup.MazeRework.Animation
         None,
         SearchHead,   // Current cell being evaluated (DFS, Prim's)
         Frontier,     // Known candidate cells (Prim's)
-        Evaluating    // Walls currently being considered (Kruskal's)
+        Evaluating,   // Walls currently being considered (Kruskal's)
+        EvaluatingValid,
+        EvaluatingInvalid
     }
 }

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/PopInAnimation.cs

@@ -0,0 +1,52 @@
+using System.Collections;
+using UnityEngine;
+
+namespace Baba_yaga.GameSetup.MazeRework.Animation
+{
+    public class PopInAnimation : MonoBehaviour
+    {
+        public float duration = 0.25f;
+        public float delay = 0f;
+
+        private void Start()
+        {
+            StartCoroutine(AnimateScale());
+        }
+
+        private IEnumerator AnimateScale()
+        {
+            Vector3 targetScale = transform.localScale;
+            Quaternion targetRot = transform.localRotation;
+            
+            transform.localScale = Vector3.zero;
+            // Start rotation off by 90 degrees on Y axis so it visibly "spins" into the correct orientation
+            transform.localRotation = targetRot * Quaternion.Euler(0, -90f, 0);
+
+            if (delay > 0f)
+                yield return new WaitForSeconds(delay);
+
+            float time = 0f;
+            while (time < duration)
+            {
+                time += Time.deltaTime;
+                float t = time / duration;
+                
+                // easeOutBack formula for a juicy overshoot effect
+                float c1 = 1.70158f;
+                float c3 = c1 + 1f;
+                float easeT = 1f + c3 * Mathf.Pow(t - 1f, 3f) + c1 * Mathf.Pow(t - 1f, 2f);
+
+                transform.localScale = targetScale * Mathf.Max(0f, easeT);
+                
+                // Spin into place using easeOut
+                float easeOutQuad = 1 - (1 - t) * (1 - t);
+                transform.localRotation = Quaternion.SlerpUnclamped(targetRot * Quaternion.Euler(0, -90f, 0), targetRot, easeT);
+                
+                yield return null;
+            }
+
+            transform.localScale = targetScale;
+            transform.localRotation = targetRot;
+        }
+    }
+}

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/Animation/PopInAnimation.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 43114e744edaec247a2ece63347b73cd

Assets/Scripts/Baba_yaga/GameSetup/MazeRework/MazeReworkSpawner.cs

@@ -28,6 +28,16 @@ namespace Baba_yaga.GameSetup.MazeRework
         [Tooltip("Prefab for the End cell (player exit point). Auto-rotates based on neighbors.")]
         public GameObject endPrefab;
 
+        [Header("Preview Mode Settings (Phase 1)")]
+        [Tooltip("If true, the spawner will only spawn simple preview blocks instead of full 3D modular pieces.")]
+        public bool isPreviewMode = false;
+        
+        [Tooltip("Simple prefab to represent carved paths during the algorithm phase (e.g. a flat plane or basic cube).")]
+        public GameObject previewPathPrefab;
+        
+        [Tooltip("Simple prefab to represent walls during the algorithm phase (optional, can be left null).")]
+        public GameObject previewWallPrefab;
+
         [Header("Highlight Prefabs (Animation Only)")]
         public GameObject searchHeadPrefab;
         public GameObject frontierPrefab;
@@ -53,7 +63,14 @@ namespace Baba_yaga.GameSetup.MazeRework
         [Tooltip("Physical distance between each grid cell center.")]
         public float spacing = 3.0f;
 
-        private readonly Dictionary<Vector2Int, GameObject> _spawnedObjects = new Dictionary<Vector2Int, GameObject>();
+        private struct SpawnedCellData
+        {
+            public GameObject Instance;
+            public GameObject Prefab;
+            public float Rotation;
+        }
+
+        private readonly Dictionary<Vector2Int, SpawnedCellData> _spawnedGridCells = new Dictionary<Vector2Int, SpawnedCellData>();
         private readonly Dictionary<Vector2Int, GameObject> _spawnedHighlights = new Dictionary<Vector2Int, GameObject>();
 
         private void Start()
@@ -80,12 +97,12 @@ namespace Baba_yaga.GameSetup.MazeRework
         /// </summary>
         public void Clear()
         {
-            foreach (var obj in _spawnedObjects.Values)
+            foreach (var data in _spawnedGridCells.Values)
             {
-                if (obj == null) continue;
+                if (data.Instance == null) continue;
-                if (Application.isPlaying) Destroy(obj); else DestroyImmediate(obj);
+                if (Application.isPlaying) Destroy(data.Instance); else DestroyImmediate(data.Instance);
             }
-            _spawnedObjects.Clear();
+            _spawnedGridCells.Clear();
 
             foreach (var obj in _spawnedHighlights.Values)
             {
@@ -131,6 +148,23 @@ namespace Baba_yaga.GameSetup.MazeRework
             RefreshSingleCell(grid, highlights, x, z - 1, width, depth, yOffset, container);
         }
 
+        public void FlashHighlight(MazeCellHighlight hType, int x, int z, float yOffset, Transform container)
+        {
+            GameObject hPrefab = null;
+            if (hType == MazeCellHighlight.EvaluatingValid) hPrefab = searchHeadPrefab;
+            else if (hType == MazeCellHighlight.EvaluatingInvalid) hPrefab = evaluatingPrefab;
+            else if (hType == MazeCellHighlight.Evaluating) hPrefab = evaluatingPrefab;
+
+            if (hPrefab != null)
+            {
+                Vector3 localPos = new Vector3(x * spacing, yOffset, z * spacing);
+                GameObject spawnedH = Instantiate(hPrefab, container != null ? container : transform);
+                spawnedH.transform.localPosition = localPos;
+                spawnedH.name = $"Flash_{hType}_{x}_{z}";
+                spawnedH.AddComponent<Animation.HighlightLinger>(); // Self-destructs after lingering
+            }
+        }
+
         private void RefreshSingleCell(MazeReworkCellType[,] grid, MazeCellHighlight[,] highlights, int x, int z, int width, int depth, float yOffset, Transform container)
         {
             if (x < 0 || x >= width || z < 0 || z >= depth) return;
@@ -153,6 +187,8 @@ namespace Baba_yaga.GameSetup.MazeRework
                 if (hType == MazeCellHighlight.SearchHead) hPrefab = searchHeadPrefab;
                 else if (hType == MazeCellHighlight.Frontier) hPrefab = frontierPrefab;
                 else if (hType == MazeCellHighlight.Evaluating) hPrefab = evaluatingPrefab;
+                else if (hType == MazeCellHighlight.EvaluatingValid) hPrefab = searchHeadPrefab; // Use same prefab or we can add new ones, but for now fallback to Head/Evaluating
+                else if (hType == MazeCellHighlight.EvaluatingInvalid) hPrefab = evaluatingPrefab;
 
                 if (hPrefab != null)
                 {
@@ -160,58 +196,86 @@ namespace Baba_yaga.GameSetup.MazeRework
                     GameObject spawnedH = Instantiate(hPrefab, container != null ? container : transform);
                     spawnedH.transform.localPosition = localPos;
                     spawnedH.name = $"Highlight_{hType}_{x}_{z}";
+                    // Highlights should pop instantly without animation since they are short-lived cursors
                     _spawnedHighlights[pos] = spawnedH;
                 }
             }
 
             // 2. Process Grid Cells
-            if (type == MazeReworkCellType.Wall)
+            GameObject targetPrefab = null;
+            float targetRot = 0f;
+            string targetName = "";
+
+            if (isPreviewMode)
             {
-                if (_spawnedObjects.TryGetValue(pos, out GameObject existing))
+                if (type == MazeReworkCellType.Wall)
                 {
-                    if (Application.isPlaying) Destroy(existing);
+                    targetPrefab = previewWallPrefab;
-                    else DestroyImmediate(existing);
+                    targetName = "PreviewWall";
-                    _spawnedObjects.Remove(pos);
+                }
+                else
+                {
+                    targetPrefab = previewPathPrefab;
+                    targetName = "PreviewPath";
+                }
+            }
+            else
+            {
+                if (type != MazeReworkCellType.Wall)
+                {
+                    if (type == MazeReworkCellType.Start && beginningPrefab != null)
+                    {
+                        (_, float baseRot) = GetModularPrefabAndRotation(grid, x, z, width, depth);
+                        targetPrefab = beginningPrefab;
+                        targetRot = baseRot + beginningRotationOffset;
+                        targetName = "Beginning";
+                    }
+                    else if (type == MazeReworkCellType.End && endPrefab != null)
+                    {
+                        (_, float baseRot) = GetModularPrefabAndRotation(grid, x, z, width, depth);
+                        targetPrefab = endPrefab;
+                        targetRot = baseRot + endRotationOffset;
+                        targetName = "End";
+                    }
+                    else
+                    {
+                        (targetPrefab, targetRot) = GetModularPrefabAndRotation(grid, x, z, width, depth);
+                        targetName = $"{type}";
+                    }
+                }
+            }
+
+            if (targetPrefab == null)
+            {
+                if (_spawnedGridCells.TryGetValue(pos, out var existing))
+                {
+                    if (Application.isPlaying) Destroy(existing.Instance);
+                    else DestroyImmediate(existing.Instance);
+                    _spawnedGridCells.Remove(pos);
                 }
                 return;
             }
 
-            if (type == MazeReworkCellType.Start && beginningPrefab != null)
+            // If it already exists and is the identical prefab/rotation, DO NOT recreate it!
+            // This prevents PopInAnimation from constantly restarting when neighbors are evaluated.
+            if (_spawnedGridCells.TryGetValue(pos, out var existingData))
             {
-                (_, float baseRot) = GetModularPrefabAndRotation(grid, x, z, width, depth);
+                if (existingData.Prefab == targetPrefab && Mathf.Approximately(existingData.Rotation, targetRot))
-                SpawnPrefab(beginningPrefab, x, yOffset, z, baseRot + beginningRotationOffset, container, "Beginning");
+                {
-                return;
+                    return; // No change needed!
+                }
+                if (Application.isPlaying) Destroy(existingData.Instance);
+                else DestroyImmediate(existingData.Instance);
             }
 
-            if (type == MazeReworkCellType.End && endPrefab != null)
+            Vector3 localPosition = new Vector3(x * spacing, yOffset, z * spacing);
-            {
+            GameObject spawnedObj = Instantiate(targetPrefab, container != null ? container : transform);
-                (_, float baseRot) = GetModularPrefabAndRotation(grid, x, z, width, depth);
-                SpawnPrefab(endPrefab, x, yOffset, z, baseRot + endRotationOffset, container, "End");
-                return;
-            }
-
-            (GameObject modularPrefab, float yRotation) = GetModularPrefabAndRotation(grid, x, z, width, depth);
-            if (modularPrefab != null)
-            {
-                SpawnPrefab(modularPrefab, x, yOffset, z, yRotation, container, $"{type}");
-            }
-        }
-
-        private void SpawnPrefab(GameObject prefab, int x, float y, int z, float yRotation, Transform container, string namePrefix)
-        {
-            Vector3 localPosition = new Vector3(x * spacing, y, z * spacing);
-            GameObject spawnedObj = Instantiate(prefab, container != null ? container : transform);
             spawnedObj.transform.localPosition = localPosition;
-            spawnedObj.transform.localRotation = Quaternion.Euler(0f, yRotation, 0f);
+            spawnedObj.transform.localRotation = Quaternion.Euler(0f, targetRot, 0f);
-            spawnedObj.name = $"{namePrefix}_{x}_{z}";
+            spawnedObj.name = $"{targetName}_{x}_{z}";
+            spawnedObj.AddComponent<Animation.PopInAnimation>();
 
-            var pos = new Vector2Int(x, z);
+            _spawnedGridCells[pos] = new SpawnedCellData { Instance = spawnedObj, Prefab = targetPrefab, Rotation = targetRot };
-            if (_spawnedObjects.TryGetValue(pos, out GameObject existing))
-            {
-                if (Application.isPlaying) Destroy(existing);
-                else DestroyImmediate(existing);
-            }
-            _spawnedObjects[pos] = spawnedObj;
         }
 
         private (GameObject, float) GetModularPrefabAndRotation(MazeReworkCellType[,] grid, int x, int z, int width, int depth)