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블록 프리팹 단위 -> 블록 청크 단위 스폰 기타 건설, 조준 관련 사이드이펙트 버그 수정
2026-01-21 21:34:05 +09:00
parent db5db4b106
commit 59246a67bd
24 changed files with 2622 additions and 127 deletions
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+      objectReference: {fileID: 0}
+    - target: {fileID: 3520563273759020846, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: m_LocalRotation.z
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 3520563273759020846, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: m_LocalEulerAnglesHint.x
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 3520563273759020846, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: m_LocalEulerAnglesHint.y
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 3520563273759020846, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: m_LocalEulerAnglesHint.z
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 5063655529130579611, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: m_Name
+      value: MineableChunk
+      objectReference: {fileID: 0}
+    - target: {fileID: 7711355090271435980, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: GlobalObjectIdHash
+      value: 1536139134
+      objectReference: {fileID: 0}
+    - target: {fileID: 7711355090271435980, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
+      propertyPath: InScenePlacedSourceGlobalObjectIdHash
+      value: 2335500207
+      objectReference: {fileID: 0}
+    m_RemovedComponents: []
+    m_RemovedGameObjects: []
+    m_AddedGameObjects: []
+    m_AddedComponents: []
+  m_SourcePrefab: {fileID: 100100000, guid: fa605604c7558cd41abc2fc25fc28e8f, type: 3}
 --- !u!1001 &3690888448170635710
 PrefabInstance:
  m_ObjectHideFlags: 0
@@ -3930,10 +3996,11 @@ SceneRoots:
  - {fileID: 743367988}
  - {fileID: 670724422}
  - {fileID: 1409253547}
-  - {fileID: 1634635645}
  - {fileID: 437093202}
  - {fileID: 1489230404}
  - {fileID: 556982644}
  - {fileID: 2067098344}
  - {fileID: 1384281111}
  - {fileID: 1782529044}
+  - {fileID: 320979913694462859}
+  - {fileID: 1026559333}
--- a/Assets/Scripts/GameBase/BuildManager.cs
+++ b/Assets/Scripts/GameBase/BuildManager.cs
@@ -2,6 +2,7 @@ using UnityEngine;
 using Unity.Netcode;
 using UnityEngine.InputSystem;
 using UnityEngine.EventSystems;
+using UnityEngine.UI;
 using System.Collections.Generic;

 public class BuildManager : NetworkBehaviour
@@ -36,6 +37,9 @@ public class BuildManager : NetworkBehaviour
    private Vector3Int _currentGridPos;
    private PlayerInputActions _inputActions;

+    // Public property to check if currently in build mode
+    public bool IsBuildMode => _isBuildMode;
+
    private Dictionary<Vector3Int, TunnelNode> _tunnelRegistry = new Dictionary<Vector3Int, TunnelNode>();
    private HashSet<Vector3Int> _occupiedNodes = new HashSet<Vector3Int>();

@@ -139,10 +143,59 @@ public class BuildManager : NetworkBehaviour
        return _tunnelRegistry.GetValueOrDefault(pos);
    }

+    // Helper method to properly check if pointer is over UI with New Input System
+    private bool IsPointerOverUI()
+    {
+        if (EventSystem.current == null) return false;
+
+        // Use the new input system's pointer position
+        Vector2 pointerPosition = Mouse.current.position.ReadValue();
+
+        PointerEventData eventData = new PointerEventData(EventSystem.current)
+        {
+            position = pointerPosition
+        };
+
+        List<RaycastResult> results = new List<RaycastResult>();
+        EventSystem.current.RaycastAll(eventData, results);
+
+        // Filter out non-interactive UI elements (crosshair, HUD, etc.)
+        foreach (var result in results)
+        {
+            GameObject uiObject = result.gameObject;
+
+            // Ignore non-interactive UI elements by name
+            if (uiObject.name == "Crosshair" ||
+                uiObject.name.Contains("HUD") ||
+                uiObject.name.Contains("Display"))
+            {
+                continue;
+            }
+
+            // Check if the UI element is actually interactive (has a Selectable component)
+            UnityEngine.UI.Selectable selectable = uiObject.GetComponent<UnityEngine.UI.Selectable>();
+            if (selectable != null && selectable.interactable)
+            {
+                return true;
+            }
+
+            // Also check parent objects for Selectable components (in case we hit a child element)
+            selectable = uiObject.GetComponentInParent<UnityEngine.UI.Selectable>();
+            if (selectable != null && selectable.interactable)
+            {
+                return true;
+            }
+        }
+
+        // No interactive UI elements found
+        return false;
+    }
+
    // 1. 건설 요청 시 실제 계산된 worldPos를 넘겨줍니다.
    private void OnBuildRequested()
    {
-        if (!_isBuildMode || EventSystem.current.IsPointerOverGameObject()) return;
+        if (!_isBuildMode) return;
+        if (IsPointerOverUI()) return;

        // 고스트가 현재 위치한 '그 좌표'를 그대로 보냅니다.
        RequestBuildRpc(_selectedTurretIndex, _currentGridPos, _ghostInstance.transform.position);
@@ -153,12 +206,30 @@ public class BuildManager : NetworkBehaviour
    [Rpc(SendTo.Server, InvokePermission = RpcInvokePermission.Everyone)]
    private void RequestBuildRpc(int index, Vector3Int gridPos, Vector3 worldPos)
    {
+        if (constructionSitePrefab == null)
+        {
+            Debug.LogError("[BuildManager] Construction site prefab is null!");
+            return;
+        }
+
        // GridToWorld를 다시 계산하지 않고 전달받은 worldPos를 그대로 사용합니다.
        GameObject siteObj = Instantiate(constructionSitePrefab, worldPos, Quaternion.identity);
-        siteObj.GetComponent<NetworkObject>().Spawn();
+
+        NetworkObject netObj = siteObj.GetComponent<NetworkObject>();
+        if (netObj == null)
+        {
+            Debug.LogError("[BuildManager] Construction site has no NetworkObject component!");
+            Destroy(siteObj);
+            return;
+        }
+
+        netObj.Spawn();

        ConstructionSite site = siteObj.GetComponent<ConstructionSite>();
-        if (site != null) site.Initialize(index, gridPos);
+        if (site != null)
+        {
+            site.Initialize(index, gridPos);
+        }
    }

    public void SelectTurret(int index)
--- a/Assets/Scripts/Player/MiningBehavior.cs
+++ b/Assets/Scripts/Player/MiningBehavior.cs
@@ -2,6 +2,7 @@

 /// <summary>
 /// Mining behavior for pickaxes and similar tools.
+/// Supports both legacy MineableBlock and new chunk-based MineableChunk.
 /// </summary>
 [CreateAssetMenu(menuName = "Items/Behaviors/Mining Behavior")]
 public class MiningBehavior : ItemBehavior
@@ -27,7 +28,25 @@ public class MiningBehavior : ItemBehavior
    {
        if (target == null) return;

-        // Use IDamageable interface for all damageable objects
+        // Try chunk-based mining first (new system)
+        if (target.TryGetComponent<MineableChunk>(out var chunk))
+        {
+            // Get the specific block index from PlayerNetworkController
+            var playerController = user.GetComponent<PlayerNetworkController>();
+            if (playerController != null)
+            {
+                var chunkTarget = playerController.GetCurrentChunkTarget();
+                if (chunkTarget.hasHit && chunkTarget.chunk == chunk)
+                {
+                    // Damage the specific block within the chunk
+                    chunk.DamageBlockServerRpc(chunkTarget.blockIndex, (byte)Mathf.Min(255, damage));
+                    return;
+                }
+            }
+            return;
+        }
+
+        // Fallback to legacy IDamageable interface
        if (target.TryGetComponent<IDamageable>(out var damageable))
        {
            damageable.TakeDamage(new DamageInfo(damage, DamageType.Mining, user));
@@ -37,8 +56,15 @@ public class MiningBehavior : ItemBehavior
    public override string GetBlockedReason(GameObject user, GameObject target)
    {
        if (target == null) return "No target";
+
+        // Check for chunk
+        if (target.TryGetComponent<MineableChunk>(out _))
+            return null; // Chunks are always mineable
+
+        // Check for legacy damageable
        if (!target.TryGetComponent<IDamageable>(out _))
            return "Cannot mine this object";
+
        return null;
    }
 }
--- a/Assets/Scripts/Player/PlayerNetworkController.cs
+++ b/Assets/Scripts/Player/PlayerNetworkController.cs
@@ -44,8 +44,13 @@ public class PlayerNetworkController : NetworkBehaviour
    private PlayerActionHandler _actionHandler;

    private RectTransform _crosshairRect;
-    private MineableBlock _currentTargetBlock; // 현재 강조 중인 블록 저장
-    private MineableBlock _lastHighlightedBlock;
+    private MineableBlock _currentTargetBlock; // 현재 강조 중인 블록 저장 (legacy)
+    private MineableBlock _lastHighlightedBlock; // legacy block targeting
+
+    // Chunk-based targeting (new system)
+    private MineableChunk _lastHighlightedChunk;
+    private int _lastHighlightedChunkBlockIndex = -1;
+    private ChunkInteractionHandler.ChunkHitResult _currentChunkTarget;

    private CharacterController _controller;
    private PlayerInputActions _inputActions;
@@ -209,13 +214,17 @@ public class PlayerNetworkController : NetworkBehaviour
    {
        if (!IsOwner || _actionHandler.IsBusy) return;

+        // Don't perform actions when in build mode
+        if (BuildManager.Instance != null && BuildManager.Instance.IsBuildMode) return;
+
        ItemData selectedItem = _inventory.GetSelectedItemData();
        if (selectedItem == null) return;

        // Check if item has behavior (new system)
        if (selectedItem.behavior != null)
        {
-            GameObject target = _lastHighlightedBlock != null ? _lastHighlightedBlock.gameObject : null;
+            // Get target - prioritize chunk system over legacy blocks
+            GameObject target = GetCurrentMiningTarget();

            // Use the new behavior system
            if (selectedItem.CanUse(gameObject, target))
@@ -334,51 +343,87 @@ public class PlayerNetworkController : NetworkBehaviour
    {
        if (!IsOwner || _crosshairRect == null) return;

-        // 1. 카메라 레이로 조준점 계산 (플레이어 몸통 무시)
+        // Use direct raycast from camera through crosshair position
+        // Use longer range (100m) from camera to catch all distances
        Ray aimRay = Camera.main.ScreenPointToRay(_crosshairRect.position);
-        Vector3 worldAimPoint;
-        if (Physics.Raycast(aimRay, out RaycastHit mouseHit, 100f, ~ignoreDuringAim))
-            worldAimPoint = mouseHit.point;
-        else
-            worldAimPoint = aimRay.GetPoint(50f);

-        // 2. 캐릭터 가슴에서 조준점을 향하는 방향 계산
-        Vector3 origin = transform.position + Vector3.up * 1.2f;
-        Vector3 direction = (worldAimPoint - origin).normalized;
-
-        // 자기 자신 충돌 방지용 오프셋
-        Vector3 rayStart = origin + direction * 0.4f;
-
-        // 3. [중요] 실제 공격과 동일한 SphereCast 실행
        RaycastHit blockHit;
-        bool hasTarget = Physics.SphereCast(rayStart, aimRadius, direction, out blockHit, attackRange - 0.4f, mineableLayer);
+        bool hasTarget = Physics.SphereCast(aimRay, aimRadius, out blockHit, 100f, mineableLayer);

-        // 4. 하이라이트 대상 업데이트
-        MineableBlock currentTarget = null;
+        // Filter by actual attack range from player
        if (hasTarget)
        {
-            currentTarget = blockHit.collider.GetComponentInParent<MineableBlock>();
+            Vector3 playerPos = transform.position + Vector3.up * 1.2f;
+            float distanceFromPlayer = Vector3.Distance(playerPos, blockHit.point);
+
+            if (distanceFromPlayer > attackRange)
+            {
+                hasTarget = false; // Too far from player to interact with
+            }
        }

-        // 대상이 바뀌었을 때만 아웃라인 갱신 (최적화)
-        if (_lastHighlightedBlock != currentTarget)
+        // 4. 하이라이트 대상 업데이트 - 청크 시스템과 레거시 블록 모두 지원
+        MineableBlock currentLegacyTarget = null;
+        MineableChunk currentChunk = null;
+        int currentChunkBlockIndex = -1;
+
+        if (hasTarget)
+        {
+            // Try chunk first (new system)
+            var chunkHit = ChunkInteractionHandler.GetChunkHit(blockHit);
+            if (chunkHit.hasHit)
+            {
+                currentChunk = chunkHit.chunk;
+                currentChunkBlockIndex = chunkHit.blockIndex;
+                _currentChunkTarget = chunkHit;
+            }
+            else
+            {
+                // Fallback to legacy MineableBlock
+                currentLegacyTarget = blockHit.collider.GetComponentInParent<MineableBlock>();
+                _currentChunkTarget = ChunkInteractionHandler.ChunkHitResult.None;
+            }
+        }
+        else
+        {
+            _currentChunkTarget = ChunkInteractionHandler.ChunkHitResult.None;
+        }
+
+        // Update chunk highlight
+        bool chunkTargetChanged = (currentChunk != _lastHighlightedChunk) ||
+                                   (currentChunkBlockIndex != _lastHighlightedChunkBlockIndex);
+        if (chunkTargetChanged)
+        {
+            if (_lastHighlightedChunk != null)
+                _lastHighlightedChunk.SetHighlight(false);
+            if (currentChunk != null)
+                currentChunk.SetHighlight(true, currentChunkBlockIndex);
+
+            _lastHighlightedChunk = currentChunk;
+            _lastHighlightedChunkBlockIndex = currentChunkBlockIndex;
+        }
+
+        // Update legacy block highlight
+        if (_lastHighlightedBlock != currentLegacyTarget)
        {
            if (_lastHighlightedBlock != null) _lastHighlightedBlock.SetHighlight(false);
-            if (currentTarget != null) currentTarget.SetHighlight(true);
-            _lastHighlightedBlock = currentTarget;
+            if (currentLegacyTarget != null) currentLegacyTarget.SetHighlight(true);
+            _lastHighlightedBlock = currentLegacyTarget;
        }

        // 기즈모 디버그 데이터 동기화
-        _debugOrigin = rayStart;
-        _debugDir = direction;
-        _debugHit = hasTarget;
-        _debugDist = hasTarget ? blockHit.distance : (attackRange - 0.4f);
+        Ray debugRay = Camera.main.ScreenPointToRay(_crosshairRect.position);
+        _debugOrigin = debugRay.origin;
+        _debugDir = debugRay.direction;
+        _debugHit = hasTarget && (currentChunk != null || currentLegacyTarget != null);
+        _debugDist = hasTarget ? blockHit.distance : attackRange;

        // 크로스헤어 이미지 교체
+        bool hasValidTarget = currentChunk != null || currentLegacyTarget != null;
        if (crosshairUI != null)
        {
-            crosshairUI.sprite = hasTarget ? targetCrosshair : idleCrosshair;
-            crosshairUI.color = hasTarget ? Color.green : Color.white;
+            crosshairUI.sprite = hasValidTarget ? targetCrosshair : idleCrosshair;
+            crosshairUI.color = hasValidTarget ? Color.green : Color.white;
        }
    }

@@ -420,11 +465,33 @@ public class PlayerNetworkController : NetworkBehaviour

    private void RevealSurroundings()
    {
+        // Use FogOfWarManager's revealRadius if available, fallback to visionRadius
+        float currentRevealRadius = visionRadius;
+        if (FogOfWarManager.Instance != null)
+        {
+            currentRevealRadius = FogOfWarManager.Instance.revealRadius;
+        }
+
        // 시야 반경 내의 블록 감지
-        Collider[] hitBlocks = Physics.OverlapSphere(transform.position, visionRadius, mineableLayer);
+        Collider[] hitBlocks = Physics.OverlapSphere(transform.position, currentRevealRadius, mineableLayer);

        foreach (var col in hitBlocks)
        {
+            // Try chunk-based reveal first (new system)
+            if (col.TryGetComponent<MineableChunk>(out var chunk))
+            {
+                // Update local visibility (for fog of war visual states)
+                chunk.UpdateLocalVisibility(transform.position, currentRevealRadius);
+
+                // Request server to mark blocks as discovered (permanent)
+                if (IsOwner)
+                {
+                    RequestChunkRevealServerRpc(chunk.GetComponent<NetworkObject>().NetworkObjectId, transform.position, currentRevealRadius);
+                }
+                continue;
+            }
+
+            // Fallback to legacy MineableBlock
            if (col.TryGetComponent<MineableBlock>(out var block))
            {
                // 1. [로컬] 내 화면에서 이 블록을 보이게 함 (실시간 시야)
@@ -451,6 +518,18 @@ public class PlayerNetworkController : NetworkBehaviour
        }
    }

+    [ServerRpc]
+    private void RequestChunkRevealServerRpc(ulong chunkNetId, Vector3 playerPos, float radius)
+    {
+        if (NetworkManager.Singleton.SpawnManager.SpawnedObjects.TryGetValue(chunkNetId, out var netObj))
+        {
+            if (netObj.TryGetComponent<MineableChunk>(out var chunk))
+            {
+                chunk.RevealBlocksInRadius(playerPos, radius);
+            }
+        }
+    }
+
    private IEnumerator ActionRoutine(float duration, string animTrigger, Action actionLogic)
    {
        // 1. 상태 잠금
@@ -516,6 +595,9 @@ public class PlayerNetworkController : NetworkBehaviour
    {
        if (_actionHandler.IsBusy) return;

+        // Don't perform actions when in build mode
+        if (BuildManager.Instance != null && BuildManager.Instance.IsBuildMode) return;
+
        ItemData selectedItem = _inventory.GetSelectedItemData();
        if (selectedItem == null || selectedItem.behavior == null) return;

@@ -525,7 +607,8 @@ public class PlayerNetworkController : NetworkBehaviour
        // Skip if non-repeatable action already executed once
        if (!actionDesc.CanRepeat && _hasExecutedOnce) return;

-        GameObject target = _lastHighlightedBlock != null ? _lastHighlightedBlock.gameObject : null;
+        // Get target - prioritize chunk system over legacy blocks
+        GameObject target = GetCurrentMiningTarget();

        if (selectedItem.CanUse(gameObject, target))
        {
@@ -537,6 +620,29 @@ public class PlayerNetworkController : NetworkBehaviour
        }
    }

+    /// <summary>
+    /// Get the current mining target (chunk or legacy block)
+    /// </summary>
+    private GameObject GetCurrentMiningTarget()
+    {
+        // Prioritize chunk target
+        if (_currentChunkTarget.hasHit && _currentChunkTarget.chunk != null)
+        {
+            return _currentChunkTarget.chunk.gameObject;
+        }
+
+        // Fallback to legacy block
+        return _lastHighlightedBlock != null ? _lastHighlightedBlock.gameObject : null;
+    }
+
+    /// <summary>
+    /// Get the current chunk target info (for MiningBehavior)
+    /// </summary>
+    public ChunkInteractionHandler.ChunkHitResult GetCurrentChunkTarget()
+    {
+        return _currentChunkTarget;
+    }
+
    private void OnDrawGizmos()
    {
        if (!Application.isPlaying || !IsOwner) return;
--- a/Assets/Scripts/Underground.meta
+++ b/Assets/Scripts/Underground.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: f0bcafb0d0408ab4f893e9c51c9e60e5
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/Assets/Scripts/Underground/BlockData.cs
+++ b/Assets/Scripts/Underground/BlockData.cs
@@ -0,0 +1,193 @@
+using Unity.Netcode;
+
+/// <summary>
+/// Compact block state struct for chunk-based storage.
+/// 3 bytes per block: type (1), health (1), flags (1)
+/// </summary>
+public struct BlockData : INetworkSerializable
+{
+    /// <summary>
+    /// Block type: 0=empty/air, 1=normal stone, 2=resource ore
+    /// </summary>
+    public byte blockType;
+
+    /// <summary>
+    /// Block health: 0-255 (0 = destroyed)
+    /// </summary>
+    public byte health;
+
+    /// <summary>
+    /// Block flags: bit 0 = isDiscovered (fog of war)
+    /// </summary>
+    public byte flags;
+
+    // Block type constants
+    public const byte TYPE_EMPTY = 0;
+    public const byte TYPE_NORMAL = 1;
+    public const byte TYPE_RESOURCE = 2;
+
+    // Flag bit masks
+    public const byte FLAG_DISCOVERED = 1 << 0;  // Has been seen at least once (networked/permanent)
+
+    /// <summary>
+    /// Whether this block is empty (air or destroyed)
+    /// </summary>
+    public bool IsEmpty => blockType == TYPE_EMPTY || health == 0;
+
+    /// <summary>
+    /// Whether this block has been discovered by players
+    /// </summary>
+    public bool IsDiscovered
+    {
+        get => (flags & FLAG_DISCOVERED) != 0;
+        set
+        {
+            if (value)
+                flags |= FLAG_DISCOVERED;
+            else
+                flags &= unchecked((byte)~FLAG_DISCOVERED);
+        }
+    }
+
+    /// <summary>
+    /// Whether this block is a resource block
+    /// </summary>
+    public bool IsResource => blockType == TYPE_RESOURCE;
+
+    /// <summary>
+    /// Create an empty block
+    /// </summary>
+    public static BlockData Empty => new BlockData
+    {
+        blockType = TYPE_EMPTY,
+        health = 0,
+        flags = 0
+    };
+
+    /// <summary>
+    /// Create a normal stone block with full health
+    /// </summary>
+    public static BlockData Normal(byte maxHealth = 100) => new BlockData
+    {
+        blockType = TYPE_NORMAL,
+        health = maxHealth,
+        flags = 0
+    };
+
+    /// <summary>
+    /// Create a resource ore block with full health
+    /// </summary>
+    public static BlockData Resource(byte maxHealth = 150) => new BlockData
+    {
+        blockType = TYPE_RESOURCE,
+        health = maxHealth,
+        flags = 0
+    };
+
+    public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
+    {
+        serializer.SerializeValue(ref blockType);
+        serializer.SerializeValue(ref health);
+        serializer.SerializeValue(ref flags);
+    }
+}
+
+/// <summary>
+/// Network-serializable container for entire chunk state.
+/// Used for initial sync when clients connect.
+/// </summary>
+public struct ChunkState : INetworkSerializable
+{
+    public BlockData[] blocks;
+
+    public const int CHUNK_SIZE = 4;
+    public const int BLOCKS_PER_CHUNK = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE; // 64
+
+    public ChunkState(int size)
+    {
+        blocks = new BlockData[size];
+    }
+
+    /// <summary>
+    /// Ensure blocks array is initialized
+    /// </summary>
+    private void EnsureInitialized()
+    {
+        if (blocks == null)
+        {
+            blocks = new BlockData[BLOCKS_PER_CHUNK];
+        }
+    }
+
+    /// <summary>
+    /// Get block at local coordinates within the chunk
+    /// </summary>
+    public BlockData GetBlock(int x, int y, int z)
+    {
+        if (blocks == null) return BlockData.Empty;
+        int index = x + y * CHUNK_SIZE + z * CHUNK_SIZE * CHUNK_SIZE;
+        if (index < 0 || index >= blocks.Length) return BlockData.Empty;
+        return blocks[index];
+    }
+
+    /// <summary>
+    /// Set block at local coordinates within the chunk
+    /// </summary>
+    public void SetBlock(int x, int y, int z, BlockData block)
+    {
+        EnsureInitialized();
+        int index = x + y * CHUNK_SIZE + z * CHUNK_SIZE * CHUNK_SIZE;
+        if (index >= 0 && index < blocks.Length)
+        {
+            blocks[index] = block;
+        }
+    }
+
+    /// <summary>
+    /// Convert local index to local 3D coordinates
+    /// </summary>
+    public static (int x, int y, int z) IndexToLocal(int index)
+    {
+        int x = index % CHUNK_SIZE;
+        int y = (index / CHUNK_SIZE) % CHUNK_SIZE;
+        int z = index / (CHUNK_SIZE * CHUNK_SIZE);
+        return (x, y, z);
+    }
+
+    /// <summary>
+    /// Convert local 3D coordinates to index
+    /// </summary>
+    public static int LocalToIndex(int x, int y, int z)
+    {
+        return x + y * CHUNK_SIZE + z * CHUNK_SIZE * CHUNK_SIZE;
+    }
+
+    public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
+    {
+        // Serialize array length first
+        int length = BLOCKS_PER_CHUNK;
+        serializer.SerializeValue(ref length);
+
+        if (serializer.IsReader)
+        {
+            blocks = new BlockData[length];
+        }
+        else if (blocks == null)
+        {
+            blocks = new BlockData[length];
+        }
+
+        for (int i = 0; i < length; i++)
+        {
+            blocks[i].NetworkSerialize(serializer);
+        }
+    }
+
+    /// <summary>
+    /// Create a default initialized ChunkState
+    /// </summary>
+    public static ChunkState CreateEmpty()
+    {
+        return new ChunkState(BLOCKS_PER_CHUNK);
+    }
+}
--- a/Assets/Scripts/Underground/BlockData.cs.meta
+++ b/Assets/Scripts/Underground/BlockData.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d2b004a2f2115024ea956fdccbb62cf1
--- a/Assets/Scripts/Underground/ChunkCoord.cs
+++ b/Assets/Scripts/Underground/ChunkCoord.cs
@@ -0,0 +1,215 @@
+using UnityEngine;
+
+/// <summary>
+/// Utility struct for chunk coordinate conversions.
+/// Handles conversions between world, grid, chunk, and local block coordinates.
+/// </summary>
+public struct ChunkCoord
+{
+    public const int CHUNK_SIZE = 4;
+
+    /// <summary>
+    /// Chunk position in chunk coordinates (not world or grid)
+    /// </summary>
+    public Vector3Int chunkPos;
+
+    public ChunkCoord(Vector3Int pos)
+    {
+        chunkPos = pos;
+    }
+
+    public ChunkCoord(int x, int y, int z)
+    {
+        chunkPos = new Vector3Int(x, y, z);
+    }
+
+    /// <summary>
+    /// Get the grid position of the chunk's origin (corner with smallest coordinates)
+    /// </summary>
+    public Vector3Int GridOrigin => new Vector3Int(
+        chunkPos.x * CHUNK_SIZE,
+        chunkPos.y * CHUNK_SIZE,
+        chunkPos.z * CHUNK_SIZE
+    );
+
+    /// <summary>
+    /// Get world position of chunk origin using BuildManager's grid system
+    /// </summary>
+    public Vector3 WorldOrigin
+    {
+        get
+        {
+            if (BuildManager.Instance != null)
+            {
+                return BuildManager.Instance.GridToWorld(GridOrigin);
+            }
+            // Fallback if BuildManager not available
+            return new Vector3(
+                GridOrigin.x + 0.5f,
+                GridOrigin.y + 0.5f,
+                GridOrigin.z + 0.5f
+            );
+        }
+    }
+
+    /// <summary>
+    /// Convert grid coordinates to chunk coordinates
+    /// </summary>
+    public static ChunkCoord FromGridPos(Vector3Int gridPos)
+    {
+        return new ChunkCoord(
+            Mathf.FloorToInt((float)gridPos.x / CHUNK_SIZE),
+            Mathf.FloorToInt((float)gridPos.y / CHUNK_SIZE),
+            Mathf.FloorToInt((float)gridPos.z / CHUNK_SIZE)
+        );
+    }
+
+    /// <summary>
+    /// Convert world position to chunk coordinates
+    /// </summary>
+    public static ChunkCoord FromWorldPos(Vector3 worldPos)
+    {
+        Vector3Int gridPos;
+        if (BuildManager.Instance != null)
+        {
+            gridPos = BuildManager.Instance.WorldToGrid3D(worldPos);
+        }
+        else
+        {
+            // Fallback
+            gridPos = new Vector3Int(
+                Mathf.RoundToInt(worldPos.x - 0.5f),
+                Mathf.RoundToInt(worldPos.y - 0.5f),
+                Mathf.RoundToInt(worldPos.z - 0.5f)
+            );
+        }
+        return FromGridPos(gridPos);
+    }
+
+    /// <summary>
+    /// Get local block coordinates within chunk from grid position
+    /// </summary>
+    public static Vector3Int GridToLocal(Vector3Int gridPos)
+    {
+        // Use modulo to get local position, handling negative coords
+        int x = ((gridPos.x % CHUNK_SIZE) + CHUNK_SIZE) % CHUNK_SIZE;
+        int y = ((gridPos.y % CHUNK_SIZE) + CHUNK_SIZE) % CHUNK_SIZE;
+        int z = ((gridPos.z % CHUNK_SIZE) + CHUNK_SIZE) % CHUNK_SIZE;
+        return new Vector3Int(x, y, z);
+    }
+
+    /// <summary>
+    /// Convert local block coordinates to grid position
+    /// </summary>
+    public Vector3Int LocalToGrid(Vector3Int localPos)
+    {
+        return GridOrigin + localPos;
+    }
+
+    /// <summary>
+    /// Convert local block coordinates to world position
+    /// </summary>
+    public Vector3 LocalToWorld(Vector3Int localPos)
+    {
+        Vector3Int gridPos = LocalToGrid(localPos);
+        if (BuildManager.Instance != null)
+        {
+            return BuildManager.Instance.GridToWorld(gridPos);
+        }
+        return new Vector3(gridPos.x + 0.5f, gridPos.y + 0.5f, gridPos.z + 0.5f);
+    }
+
+    /// <summary>
+    /// Convert local index to local 3D coordinates
+    /// </summary>
+    public static Vector3Int IndexToLocal(int index)
+    {
+        int x = index % CHUNK_SIZE;
+        int y = (index / CHUNK_SIZE) % CHUNK_SIZE;
+        int z = index / (CHUNK_SIZE * CHUNK_SIZE);
+        return new Vector3Int(x, y, z);
+    }
+
+    /// <summary>
+    /// Convert local 3D coordinates to index
+    /// </summary>
+    public static int LocalToIndex(Vector3Int localPos)
+    {
+        return localPos.x + localPos.y * CHUNK_SIZE + localPos.z * CHUNK_SIZE * CHUNK_SIZE;
+    }
+
+    /// <summary>
+    /// Convert local coordinates (int) to index
+    /// </summary>
+    public static int LocalToIndex(int x, int y, int z)
+    {
+        return x + y * CHUNK_SIZE + z * CHUNK_SIZE * CHUNK_SIZE;
+    }
+
+    /// <summary>
+    /// Check if local coordinates are within valid range
+    /// </summary>
+    public static bool IsValidLocal(int x, int y, int z)
+    {
+        return x >= 0 && x < CHUNK_SIZE &&
+               y >= 0 && y < CHUNK_SIZE &&
+               z >= 0 && z < CHUNK_SIZE;
+    }
+
+    /// <summary>
+    /// Check if local position is within valid range
+    /// </summary>
+    public static bool IsValidLocal(Vector3Int local)
+    {
+        return IsValidLocal(local.x, local.y, local.z);
+    }
+
+    /// <summary>
+    /// Convert world hit point to local block index within chunk
+    /// </summary>
+    public int WorldPointToLocalIndex(Vector3 worldPoint)
+    {
+        // Get chunk origin in world space
+        Vector3 chunkWorldOrigin = WorldOrigin;
+
+        // Calculate offset from chunk origin (in grid units, assuming 1 unit per block)
+        float cellSize = BuildManager.Instance != null ? BuildManager.Instance.cellSize : 1f;
+        Vector3 offset = (worldPoint - chunkWorldOrigin) / cellSize;
+
+        // Convert to local coordinates (add small epsilon to handle edge cases)
+        int lx = Mathf.Clamp(Mathf.FloorToInt(offset.x + 0.5f), 0, CHUNK_SIZE - 1);
+        int ly = Mathf.Clamp(Mathf.FloorToInt(offset.y + 0.5f), 0, CHUNK_SIZE - 1);
+        int lz = Mathf.Clamp(Mathf.FloorToInt(offset.z + 0.5f), 0, CHUNK_SIZE - 1);
+
+        return LocalToIndex(lx, ly, lz);
+    }
+
+    public override bool Equals(object obj)
+    {
+        if (obj is ChunkCoord other)
+        {
+            return chunkPos == other.chunkPos;
+        }
+        return false;
+    }
+
+    public override int GetHashCode()
+    {
+        return chunkPos.GetHashCode();
+    }
+
+    public static bool operator ==(ChunkCoord a, ChunkCoord b)
+    {
+        return a.chunkPos == b.chunkPos;
+    }
+
+    public static bool operator !=(ChunkCoord a, ChunkCoord b)
+    {
+        return a.chunkPos != b.chunkPos;
+    }
+
+    public override string ToString()
+    {
+        return $"ChunkCoord({chunkPos.x}, {chunkPos.y}, {chunkPos.z})";
+    }
+}
--- a/Assets/Scripts/Underground/ChunkCoord.cs.meta
+++ b/Assets/Scripts/Underground/ChunkCoord.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 08589d2f166b446418cc8b61105e6d01
--- a/Assets/Scripts/Underground/ChunkInteractionHandler.cs
+++ b/Assets/Scripts/Underground/ChunkInteractionHandler.cs
@@ -0,0 +1,126 @@
+using UnityEngine;
+
+/// <summary>
+/// Handles interaction between players and chunk-based blocks.
+/// Converts raycast hits to block indices and manages damage/reveal requests.
+/// </summary>
+public static class ChunkInteractionHandler
+{
+    /// <summary>
+    /// Result of a chunk interaction query
+    /// </summary>
+    public struct ChunkHitResult
+    {
+        public bool hasHit;
+        public MineableChunk chunk;
+        public int blockIndex;
+        public Vector3 hitPoint;
+        public Vector3 blockWorldPosition;
+        public BlockData blockData;
+
+        public static ChunkHitResult None => new ChunkHitResult { hasHit = false };
+    }
+
+    /// <summary>
+    /// Try to get chunk and block info from a raycast hit
+    /// </summary>
+    public static ChunkHitResult GetChunkHit(RaycastHit hit)
+    {
+        // Try to get MineableChunk from hit collider
+        MineableChunk chunk = hit.collider.GetComponentInParent<MineableChunk>();
+        if (chunk == null)
+        {
+            return ChunkHitResult.None;
+        }
+
+        // Convert hit point to block index
+        // Push slightly into the surface using the normal to get the correct block
+        Vector3 insidePoint = hit.point - hit.normal * 0.01f;
+        int blockIndex = chunk.WorldPointToBlockIndex(insidePoint);
+        BlockData blockData = chunk.GetBlock(blockIndex);
+
+        // Skip if block is empty
+        if (blockData.IsEmpty)
+        {
+            return ChunkHitResult.None;
+        }
+
+        return new ChunkHitResult
+        {
+            hasHit = true,
+            chunk = chunk,
+            blockIndex = blockIndex,
+            hitPoint = hit.point,
+            blockWorldPosition = chunk.GetBlockWorldPosition(blockIndex),
+            blockData = blockData
+        };
+    }
+
+    /// <summary>
+    /// Try to damage a block at a raycast hit point
+    /// </summary>
+    public static bool TryDamageAtPoint(RaycastHit hit, float damage)
+    {
+        ChunkHitResult result = GetChunkHit(hit);
+        if (!result.hasHit) return false;
+
+        // Request damage on server
+        result.chunk.DamageBlockServerRpc(result.blockIndex, (byte)Mathf.Min(255, damage));
+        return true;
+    }
+
+    /// <summary>
+    /// Try to damage a block directly on a known chunk
+    /// </summary>
+    public static bool TryDamageBlock(MineableChunk chunk, int blockIndex, float damage)
+    {
+        if (chunk == null) return false;
+
+        BlockData block = chunk.GetBlock(blockIndex);
+        if (block.IsEmpty) return false;
+
+        chunk.DamageBlockServerRpc(blockIndex, (byte)Mathf.Min(255, damage));
+        return true;
+    }
+
+    /// <summary>
+    /// Try to reveal a block at a raycast hit point
+    /// </summary>
+    public static bool TryRevealAtPoint(RaycastHit hit)
+    {
+        MineableChunk chunk = hit.collider.GetComponentInParent<MineableChunk>();
+        if (chunk == null) return false;
+
+        int blockIndex = chunk.WorldPointToBlockIndex(hit.point - hit.normal * 0.1f);
+        BlockData blockData = chunk.GetBlock(blockIndex);
+
+        if (blockData.IsEmpty || blockData.IsDiscovered) return false;
+
+        chunk.RevealBlockServerRpc(blockIndex);
+        return true;
+    }
+
+    /// <summary>
+    /// Perform a sphere cast to find a targetable block in a chunk
+    /// </summary>
+    public static ChunkHitResult SphereCastForBlock(Vector3 origin, Vector3 direction, float radius, float maxDistance, LayerMask chunkLayer)
+    {
+        if (Physics.SphereCast(origin, radius, direction, out RaycastHit hit, maxDistance, chunkLayer))
+        {
+            return GetChunkHit(hit);
+        }
+        return ChunkHitResult.None;
+    }
+
+    /// <summary>
+    /// Perform a raycast to find a targetable block in a chunk
+    /// </summary>
+    public static ChunkHitResult RaycastForBlock(Vector3 origin, Vector3 direction, float maxDistance, LayerMask chunkLayer)
+    {
+        if (Physics.Raycast(origin, direction, out RaycastHit hit, maxDistance, chunkLayer))
+        {
+            return GetChunkHit(hit);
+        }
+        return ChunkHitResult.None;
+    }
+}
--- a/Assets/Scripts/Underground/ChunkInteractionHandler.cs.meta
+++ b/Assets/Scripts/Underground/ChunkInteractionHandler.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 3fc7fb23f18204f4eafbf4395b12aba5
--- a/Assets/Scripts/Underground/ChunkMeshBuilder.cs
+++ b/Assets/Scripts/Underground/ChunkMeshBuilder.cs
@@ -0,0 +1,330 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+/// <summary>
+/// Builds optimized meshes for chunks with face culling.
+/// Only renders faces that are exposed (adjacent to empty blocks or chunk boundaries).
+/// Uses submeshes for different block types (normal/resource).
+/// </summary>
+public static class ChunkMeshBuilder
+{
+    private const int CHUNK_SIZE = ChunkCoord.CHUNK_SIZE;
+
+    // Face directions
+    private static readonly Vector3Int[] FaceDirections = new Vector3Int[]
+    {
+        Vector3Int.right,   // +X
+        Vector3Int.left,    // -X
+        Vector3Int.up,      // +Y
+        Vector3Int.down,    // -Y
+        new Vector3Int(0, 0, 1),  // +Z
+        new Vector3Int(0, 0, -1)  // -Z
+    };
+
+    // Face normals matching directions
+    private static readonly Vector3[] FaceNormals = new Vector3[]
+    {
+        Vector3.right,
+        Vector3.left,
+        Vector3.up,
+        Vector3.down,
+        Vector3.forward,
+        Vector3.back
+    };
+
+    // Vertices for each face (relative to block center)
+    private static readonly Vector3[][] FaceVertices = new Vector3[][]
+    {
+        // +X face
+        new Vector3[] {
+            new Vector3(0.5f, -0.5f, -0.5f),
+            new Vector3(0.5f,  0.5f, -0.5f),
+            new Vector3(0.5f,  0.5f,  0.5f),
+            new Vector3(0.5f, -0.5f,  0.5f)
+        },
+        // -X face
+        new Vector3[] {
+            new Vector3(-0.5f, -0.5f,  0.5f),
+            new Vector3(-0.5f,  0.5f,  0.5f),
+            new Vector3(-0.5f,  0.5f, -0.5f),
+            new Vector3(-0.5f, -0.5f, -0.5f)
+        },
+        // +Y face
+        new Vector3[] {
+            new Vector3(-0.5f, 0.5f, -0.5f),
+            new Vector3(-0.5f, 0.5f,  0.5f),
+            new Vector3( 0.5f, 0.5f,  0.5f),
+            new Vector3( 0.5f, 0.5f, -0.5f)
+        },
+        // -Y face
+        new Vector3[] {
+            new Vector3(-0.5f, -0.5f,  0.5f),
+            new Vector3(-0.5f, -0.5f, -0.5f),
+            new Vector3( 0.5f, -0.5f, -0.5f),
+            new Vector3( 0.5f, -0.5f,  0.5f)
+        },
+        // +Z face
+        new Vector3[] {
+            new Vector3(-0.5f, -0.5f, 0.5f),
+            new Vector3( 0.5f, -0.5f, 0.5f),
+            new Vector3( 0.5f,  0.5f, 0.5f),
+            new Vector3(-0.5f,  0.5f, 0.5f)
+        },
+        // -Z face
+        new Vector3[] {
+            new Vector3( 0.5f, -0.5f, -0.5f),
+            new Vector3(-0.5f, -0.5f, -0.5f),
+            new Vector3(-0.5f,  0.5f, -0.5f),
+            new Vector3( 0.5f,  0.5f, -0.5f)
+        }
+    };
+
+    // UV coordinates for each face
+    private static readonly Vector2[] FaceUVs = new Vector2[]
+    {
+        new Vector2(0, 0),
+        new Vector2(1, 0),
+        new Vector2(1, 1),
+        new Vector2(0, 1)
+    };
+
+    /// <summary>
+    /// Interface for querying neighboring chunks for cross-chunk face culling
+    /// </summary>
+    public interface INeighborProvider
+    {
+        /// <summary>
+        /// Check if block at world grid position is solid (for face culling)
+        /// </summary>
+        bool IsBlockSolid(Vector3Int gridPos);
+    }
+
+    /// <summary>
+    /// Visibility check delegate for fog of war
+    /// </summary>
+    public delegate bool VisibilityChecker(int blockIndex);
+
+    /// <summary>
+    /// Build mesh for a chunk with face culling.
+    /// Returns a mesh with two submeshes: 0=normal blocks, 1=resource blocks
+    /// </summary>
+    public static Mesh BuildMesh(ChunkState state, ChunkCoord coord, INeighborProvider neighborProvider = null, bool onlyDiscovered = true)
+    {
+        return BuildMeshWithVisibility(state, coord, neighborProvider, onlyDiscovered, null);
+    }
+
+    /// <summary>
+    /// Build mesh for a chunk with face culling and fog of war support.
+    /// Returns a mesh with 4 submeshes: 0=normal-visible, 1=resource-visible, 2=normal-dark, 3=resource-dark
+    /// </summary>
+    public static Mesh BuildMeshWithVisibility(ChunkState state, ChunkCoord coord, INeighborProvider neighborProvider, bool onlyDiscovered, VisibilityChecker isVisible)
+    {
+        // Lists for 4 submeshes: normal-visible, resource-visible, normal-dark, resource-dark
+        var meshData = new MeshData[4];
+        for (int i = 0; i < 4; i++)
+        {
+            meshData[i] = new MeshData();
+        }
+
+        // Handle null blocks array
+        if (state.blocks == null)
+        {
+            return CreateEmptyMesh(coord, 4);
+        }
+
+        // Process each block
+        for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+        {
+            BlockData block = state.blocks[i];
+
+            // Skip empty blocks
+            if (block.IsEmpty) continue;
+
+            // Skip undiscovered blocks if onlyDiscovered is true
+            if (onlyDiscovered && !block.IsDiscovered) continue;
+
+            Vector3Int localPos = ChunkCoord.IndexToLocal(i);
+            Vector3 blockOffset = new Vector3(localPos.x, localPos.y, localPos.z);
+
+            // Determine which submesh to use based on block type and visibility
+            bool currentlyVisible = isVisible != null ? isVisible(i) : true;
+            int submeshIndex;
+            if (block.IsResource)
+            {
+                submeshIndex = currentlyVisible ? 1 : 3; // resource-visible or resource-dark
+            }
+            else
+            {
+                submeshIndex = currentlyVisible ? 0 : 2; // normal-visible or normal-dark
+            }
+
+            var data = meshData[submeshIndex];
+
+            // Check each face
+            for (int f = 0; f < 6; f++)
+            {
+                Vector3Int neighborLocal = localPos + FaceDirections[f];
+
+                bool shouldRenderFace = false;
+
+                if (ChunkCoord.IsValidLocal(neighborLocal))
+                {
+                    int neighborIndex = ChunkCoord.LocalToIndex(neighborLocal);
+                    BlockData neighborBlock = state.blocks[neighborIndex];
+                    shouldRenderFace = neighborBlock.IsEmpty || (onlyDiscovered && !neighborBlock.IsDiscovered);
+                }
+                else
+                {
+                    if (neighborProvider != null)
+                    {
+                        Vector3Int neighborGridPos = coord.LocalToGrid(neighborLocal);
+                        shouldRenderFace = !neighborProvider.IsBlockSolid(neighborGridPos);
+                    }
+                    else
+                    {
+                        shouldRenderFace = true;
+                    }
+                }
+
+                if (shouldRenderFace)
+                {
+                    AddFace(data.vertices, data.normals, data.uvs, data.triangles, blockOffset, f);
+                }
+            }
+        }
+
+        // Create the mesh
+        Mesh mesh = new Mesh();
+        mesh.name = $"Chunk_{coord.chunkPos.x}_{coord.chunkPos.y}_{coord.chunkPos.z}";
+
+        // Combine all vertices from all submeshes
+        int totalVerts = 0;
+        int[] vertOffsets = new int[4];
+        for (int i = 0; i < 4; i++)
+        {
+            vertOffsets[i] = totalVerts;
+            totalVerts += meshData[i].vertices.Count;
+        }
+
+        var allVertices = new Vector3[totalVerts];
+        var allNormals = new Vector3[totalVerts];
+        var allUVs = new Vector2[totalVerts];
+
+        for (int i = 0; i < 4; i++)
+        {
+            meshData[i].vertices.CopyTo(allVertices, vertOffsets[i]);
+            meshData[i].normals.CopyTo(allNormals, vertOffsets[i]);
+            meshData[i].uvs.CopyTo(allUVs, vertOffsets[i]);
+        }
+
+        mesh.vertices = allVertices;
+        mesh.normals = allNormals;
+        mesh.uv = allUVs;
+
+        // Set submeshes with adjusted triangle indices
+        mesh.subMeshCount = 4;
+        for (int i = 0; i < 4; i++)
+        {
+            var triangles = meshData[i].triangles;
+            for (int t = 0; t < triangles.Count; t++)
+            {
+                triangles[t] += vertOffsets[i];
+            }
+            mesh.SetTriangles(triangles, i);
+        }
+
+        mesh.RecalculateBounds();
+        return mesh;
+    }
+
+    /// <summary>
+    /// Helper class to hold mesh data for each submesh
+    /// </summary>
+    private class MeshData
+    {
+        public List<Vector3> vertices = new List<Vector3>();
+        public List<Vector3> normals = new List<Vector3>();
+        public List<Vector2> uvs = new List<Vector2>();
+        public List<int> triangles = new List<int>();
+    }
+
+    /// <summary>
+    /// Create an empty mesh with proper submesh configuration
+    /// </summary>
+    private static Mesh CreateEmptyMesh(ChunkCoord coord, int submeshCount = 4)
+    {
+        Mesh mesh = new Mesh();
+        mesh.name = $"Chunk_{coord.chunkPos.x}_{coord.chunkPos.y}_{coord.chunkPos.z}_Empty";
+        mesh.subMeshCount = submeshCount;
+        for (int i = 0; i < submeshCount; i++)
+        {
+            mesh.SetTriangles(new int[0], i);
+        }
+        return mesh;
+    }
+
+    /// <summary>
+    /// Add a face to the mesh data
+    /// </summary>
+    private static void AddFace(List<Vector3> vertices, List<Vector3> normals, List<Vector2> uvs, List<int> triangles, Vector3 blockOffset, int faceIndex)
+    {
+        int startVertex = vertices.Count;
+
+        // Add vertices
+        for (int i = 0; i < 4; i++)
+        {
+            vertices.Add(FaceVertices[faceIndex][i] + blockOffset);
+            normals.Add(FaceNormals[faceIndex]);
+            uvs.Add(FaceUVs[i]);
+        }
+
+        // Add triangles (two triangles per face)
+        triangles.Add(startVertex);
+        triangles.Add(startVertex + 1);
+        triangles.Add(startVertex + 2);
+
+        triangles.Add(startVertex);
+        triangles.Add(startVertex + 2);
+        triangles.Add(startVertex + 3);
+    }
+
+    /// <summary>
+    /// Count visible faces in a chunk (for debugging/stats)
+    /// </summary>
+    public static int CountVisibleFaces(ChunkState state, bool onlyDiscovered = true)
+    {
+        if (state.blocks == null) return 0;
+
+        int faceCount = 0;
+
+        for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+        {
+            BlockData block = state.blocks[i];
+            if (block.IsEmpty) continue;
+            if (onlyDiscovered && !block.IsDiscovered) continue;
+
+            Vector3Int localPos = ChunkCoord.IndexToLocal(i);
+
+            for (int f = 0; f < 6; f++)
+            {
+                Vector3Int neighborLocal = localPos + FaceDirections[f];
+
+                if (ChunkCoord.IsValidLocal(neighborLocal))
+                {
+                    int neighborIndex = ChunkCoord.LocalToIndex(neighborLocal);
+                    BlockData neighborBlock = state.blocks[neighborIndex];
+                    if (neighborBlock.IsEmpty || (onlyDiscovered && !neighborBlock.IsDiscovered))
+                    {
+                        faceCount++;
+                    }
+                }
+                else
+                {
+                    faceCount++;
+                }
+            }
+        }
+
+        return faceCount;
+    }
+}
--- a/Assets/Scripts/Underground/ChunkMeshBuilder.cs.meta
+++ b/Assets/Scripts/Underground/ChunkMeshBuilder.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 02008c1a2b561f049ae0f8b78dd9d22c
--- a/Assets/Scripts/Underground/ChunkedUndergroundGenerator.cs
+++ b/Assets/Scripts/Underground/ChunkedUndergroundGenerator.cs
@@ -0,0 +1,389 @@
+using System.Collections.Generic;
+using Unity.Netcode;
+using UnityEngine;
+
+/// <summary>
+/// Generates underground terrain using chunk-based system.
+/// Replaces individual MineableBlock NetworkObjects with MineableChunk NetworkObjects.
+/// </summary>
+public class ChunkedUndergroundGenerator : NetworkBehaviour
+{
+    public static ChunkedUndergroundGenerator Instance { get; private set; }
+
+    [Header("Generation Range (in blocks)")]
+    [SerializeField] private Vector3Int generationRange = new Vector3Int(20, 30, 10);
+    [SerializeField] private float noiseScale = 0.12f;
+
+    [Header("Thresholds (0 to 1)")]
+    [SerializeField, Range(0, 1)] private float hollowThreshold = 0.35f;
+    [SerializeField, Range(0, 1)] private float baseResourceThreshold = 0.85f;
+
+    [Header("Resource Distribution")]
+    [SerializeField] private float resourceNoiseScale = 0.25f; // Larger = more spread out
+    [SerializeField, Range(0, 1)] private float resourceSpawnChance = 0.3f; // Additional random chance
+
+    [Header("Depth Settings")]
+    [SerializeField] private bool increaseResourceWithDepth = true;
+    [SerializeField] private float depthFactor = 0.003f;
+
+    [Header("Block Health")]
+    [SerializeField] private byte normalBlockHealth = 100;
+    [SerializeField] private byte resourceBlockHealth = 150;
+
+    [Header("Chunk Prefab")]
+    [SerializeField] private GameObject chunkPrefab;
+
+    [Header("Organization")]
+    [SerializeField] private string containerName = "UndergroundChunks";
+    private Transform _chunkContainer;
+
+    // Chunk registry for neighbor queries
+    private Dictionary<Vector3Int, MineableChunk> _chunkRegistry = new Dictionary<Vector3Int, MineableChunk>();
+
+    // Noise seeds
+    private float _seedX, _seedY, _seedZ;
+    private float _resourceSeedX, _resourceSeedY, _resourceSeedZ;
+
+    private void Awake()
+    {
+        if (Instance == null)
+        {
+            Instance = this;
+        }
+        else
+        {
+            Destroy(gameObject);
+            return;
+        }
+
+        _seedX = Random.Range(0f, 99999f);
+        _seedY = Random.Range(0f, 99999f);
+        _seedZ = Random.Range(0f, 99999f);
+
+        // Separate seeds for resource distribution
+        _resourceSeedX = Random.Range(0f, 99999f);
+        _resourceSeedY = Random.Range(0f, 99999f);
+        _resourceSeedZ = Random.Range(0f, 99999f);
+
+        // Create container for hierarchy organization
+        _chunkContainer = new GameObject(containerName).transform;
+    }
+
+    public override void OnNetworkSpawn()
+    {
+        // Register with MineableChunk for neighbor queries
+        MineableChunk.SetChunkManager(this);
+
+        if (IsServer)
+        {
+            GenerateChunks();
+        }
+    }
+
+    /// <summary>
+    /// Generate all chunks for the underground area
+    /// </summary>
+    private void GenerateChunks()
+    {
+        Vector3Int originGrid = BuildManager.Instance.WorldToGrid3D(transform.position);
+
+        // Calculate chunk range
+        int chunkSizeX = Mathf.CeilToInt((float)generationRange.x / ChunkCoord.CHUNK_SIZE);
+        int chunkSizeY = Mathf.CeilToInt((float)generationRange.y / ChunkCoord.CHUNK_SIZE);
+        int chunkSizeZ = Mathf.CeilToInt((float)generationRange.z / ChunkCoord.CHUNK_SIZE);
+
+        Debug.Log($"[ChunkedGenerator] Generating {chunkSizeX}x{chunkSizeY}x{chunkSizeZ} chunks = {chunkSizeX * chunkSizeY * chunkSizeZ} total");
+
+        int chunksGenerated = 0;
+        int chunksSkipped = 0;
+
+        // Generate chunks
+        for (int cx = 0; cx < chunkSizeX; cx++)
+        {
+            for (int cy = 0; cy < chunkSizeY; cy++)
+            {
+                for (int cz = 0; cz < chunkSizeZ; cz++)
+                {
+                    // Calculate chunk grid origin (going downward for Y)
+                    Vector3Int chunkGridOrigin = originGrid + new Vector3Int(
+                        cx * ChunkCoord.CHUNK_SIZE,
+                        -cy * ChunkCoord.CHUNK_SIZE, // Negative Y (underground)
+                        cz * ChunkCoord.CHUNK_SIZE
+                    );
+
+                    // Generate block data for this chunk
+                    ChunkState state = GenerateChunkState(chunkGridOrigin);
+
+                    // Check if chunk has any blocks
+                    bool hasBlocks = false;
+                    for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+                    {
+                        if (!state.blocks[i].IsEmpty)
+                        {
+                            hasBlocks = true;
+                            break;
+                        }
+                    }
+
+                    if (!hasBlocks)
+                    {
+                        chunksSkipped++;
+                        continue;
+                    }
+
+                    // Spawn chunk
+                    SpawnChunk(chunkGridOrigin, state);
+                    chunksGenerated++;
+                }
+            }
+        }
+
+        Debug.Log($"[ChunkedGenerator] Generated {chunksGenerated} chunks, skipped {chunksSkipped} empty chunks");
+    }
+
+    /// <summary>
+    /// Generate block state for a chunk
+    /// </summary>
+    private ChunkState GenerateChunkState(Vector3Int chunkGridOrigin)
+    {
+        ChunkState state = ChunkState.CreateEmpty();
+
+        for (int lx = 0; lx < ChunkCoord.CHUNK_SIZE; lx++)
+        {
+            for (int ly = 0; ly < ChunkCoord.CHUNK_SIZE; ly++)
+            {
+                for (int lz = 0; lz < ChunkCoord.CHUNK_SIZE; lz++)
+                {
+                    Vector3Int gridPos = chunkGridOrigin + new Vector3Int(lx, ly, lz);
+                    int index = ChunkCoord.LocalToIndex(lx, ly, lz);
+
+                    // Check if within generation range
+                    Vector3Int originGrid = BuildManager.Instance.WorldToGrid3D(transform.position);
+                    Vector3Int offset = gridPos - originGrid;
+
+                    if (offset.x < 0 || offset.x >= generationRange.x ||
+                        offset.y > 0 || offset.y <= -generationRange.y ||
+                        offset.z < 0 || offset.z >= generationRange.z)
+                    {
+                        state.blocks[index] = BlockData.Empty;
+                        continue;
+                    }
+
+                    // Sample noise
+                    float noise = Get3DNoise(gridPos.x, gridPos.y, gridPos.z);
+
+                    // Check hollow threshold
+                    if (noise < hollowThreshold)
+                    {
+                        state.blocks[index] = BlockData.Empty;
+                        continue;
+                    }
+
+                    // Determine block type using separate resource noise for better distribution
+                    float resourceNoise = GetResourceNoise(gridPos.x, gridPos.y, gridPos.z);
+
+                    float currentThreshold = baseResourceThreshold;
+                    if (increaseResourceWithDepth)
+                    {
+                        currentThreshold += gridPos.y * depthFactor; // Lower threshold = more resources at depth
+                    }
+
+                    // Resource spawns only if: resource noise > threshold AND random chance passes
+                    bool isResource = resourceNoise > currentThreshold &&
+                                      Random.value < resourceSpawnChance;
+
+                    if (isResource)
+                    {
+                        state.blocks[index] = BlockData.Resource(resourceBlockHealth);
+                    }
+                    else
+                    {
+                        state.blocks[index] = BlockData.Normal(normalBlockHealth);
+                    }
+                }
+            }
+        }
+
+        return state;
+    }
+
+    /// <summary>
+    /// Spawn a chunk NetworkObject
+    /// </summary>
+    private void SpawnChunk(Vector3Int chunkGridOrigin, ChunkState state)
+    {
+        if (chunkPrefab == null)
+        {
+            Debug.LogError("[ChunkedGenerator] Chunk prefab not assigned!");
+            return;
+        }
+
+        // Calculate world position for chunk
+        Vector3 worldPos = BuildManager.Instance.GridToWorld(chunkGridOrigin);
+
+        // Instantiate chunk
+        GameObject chunkObj = Instantiate(chunkPrefab, worldPos, Quaternion.identity, _chunkContainer);
+
+        // Spawn on network
+        NetworkObject netObj = chunkObj.GetComponent<NetworkObject>();
+        netObj.Spawn();
+
+        // Initialize chunk with block data
+        MineableChunk chunk = chunkObj.GetComponent<MineableChunk>();
+        if (chunk != null)
+        {
+            chunk.InitializeBlocks(state);
+
+            // Register in dictionary
+            ChunkCoord coord = ChunkCoord.FromGridPos(chunkGridOrigin);
+            _chunkRegistry[coord.chunkPos] = chunk;
+        }
+    }
+
+    /// <summary>
+    /// 3D Perlin noise sampling for terrain shape
+    /// </summary>
+    private float Get3DNoise(int x, int y, int z)
+    {
+        float xCoord = (x + _seedX + 10000f) * noiseScale;
+        float yCoord = (y + _seedY + 10000f) * noiseScale;
+        float zCoord = (z + _seedZ + 10000f) * noiseScale;
+
+        float ab = Mathf.PerlinNoise(xCoord, yCoord);
+        float bc = Mathf.PerlinNoise(yCoord, zCoord);
+        float ac = Mathf.PerlinNoise(xCoord, zCoord);
+
+        return (ab + bc + ac) / 3f;
+    }
+
+    /// <summary>
+    /// Separate 3D noise for resource distribution (more spread out)
+    /// </summary>
+    private float GetResourceNoise(int x, int y, int z)
+    {
+        float xCoord = (x + _resourceSeedX + 10000f) * resourceNoiseScale;
+        float yCoord = (y + _resourceSeedY + 10000f) * resourceNoiseScale;
+        float zCoord = (z + _resourceSeedZ + 10000f) * resourceNoiseScale;
+
+        float ab = Mathf.PerlinNoise(xCoord, yCoord);
+        float bc = Mathf.PerlinNoise(yCoord, zCoord);
+        float ac = Mathf.PerlinNoise(xCoord, zCoord);
+
+        return (ab + bc + ac) / 3f;
+    }
+
+    #region Public Query Methods
+
+    /// <summary>
+    /// Get chunk at grid position
+    /// </summary>
+    public MineableChunk GetChunkAtGrid(Vector3Int gridPos)
+    {
+        ChunkCoord coord = ChunkCoord.FromGridPos(gridPos);
+        _chunkRegistry.TryGetValue(coord.chunkPos, out MineableChunk chunk);
+        return chunk;
+    }
+
+    /// <summary>
+    /// Get chunk at world position
+    /// </summary>
+    public MineableChunk GetChunkAtWorld(Vector3 worldPos)
+    {
+        ChunkCoord coord = ChunkCoord.FromWorldPos(worldPos);
+        _chunkRegistry.TryGetValue(coord.chunkPos, out MineableChunk chunk);
+        return chunk;
+    }
+
+    /// <summary>
+    /// Check if block at grid position is solid (for cross-chunk face culling)
+    /// </summary>
+    public bool IsBlockSolid(Vector3Int gridPos)
+    {
+        MineableChunk chunk = GetChunkAtGrid(gridPos);
+        if (chunk == null) return false;
+
+        Vector3Int localPos = ChunkCoord.GridToLocal(gridPos);
+        int index = ChunkCoord.LocalToIndex(localPos);
+        BlockData block = chunk.GetBlock(index);
+
+        return !block.IsEmpty && block.IsDiscovered;
+    }
+
+    /// <summary>
+    /// Reveal blocks in radius around a world position (for fog of war)
+    /// </summary>
+    public void RevealBlocksInRadius(Vector3 worldPos, float radius)
+    {
+        if (!IsServer) return;
+
+        // Find all chunks that could be affected
+        foreach (var chunk in _chunkRegistry.Values)
+        {
+            if (chunk == null) continue;
+
+            // Quick bounds check - chunk center distance
+            float chunkDist = Vector3.Distance(worldPos, chunk.transform.position);
+            float maxChunkRadius = ChunkCoord.CHUNK_SIZE * 0.866f; // diagonal
+
+            if (chunkDist <= radius + maxChunkRadius)
+            {
+                chunk.RevealBlocksInRadius(worldPos, radius);
+            }
+        }
+    }
+
+    /// <summary>
+    /// Get all active chunks
+    /// </summary>
+    public IEnumerable<MineableChunk> GetAllChunks()
+    {
+        return _chunkRegistry.Values;
+    }
+
+    #endregion
+
+    #region Gizmos
+
+    private void OnDrawGizmosSelected()
+    {
+        BuildManager bm = BuildManager.Instance;
+        if (bm == null) bm = FindFirstObjectByType<BuildManager>();
+        if (bm == null) return;
+
+        Vector3Int originGrid = bm.WorldToGrid3D(transform.position);
+
+        // Draw chunk boundaries
+        int chunkSizeX = Mathf.CeilToInt((float)generationRange.x / ChunkCoord.CHUNK_SIZE);
+        int chunkSizeY = Mathf.CeilToInt((float)generationRange.y / ChunkCoord.CHUNK_SIZE);
+        int chunkSizeZ = Mathf.CeilToInt((float)generationRange.z / ChunkCoord.CHUNK_SIZE);
+
+        Gizmos.color = new Color(0, 1, 0, 0.3f);
+
+        for (int cx = 0; cx < chunkSizeX; cx++)
+        {
+            for (int cy = 0; cy < chunkSizeY; cy++)
+            {
+                for (int cz = 0; cz < chunkSizeZ; cz++)
+                {
+                    Vector3Int chunkGridOrigin = originGrid + new Vector3Int(
+                        cx * ChunkCoord.CHUNK_SIZE,
+                        -cy * ChunkCoord.CHUNK_SIZE,
+                        cz * ChunkCoord.CHUNK_SIZE
+                    );
+
+                    Vector3 worldPos = bm.GridToWorld(chunkGridOrigin);
+                    // Offset to center of chunk
+                    worldPos += new Vector3(
+                        (ChunkCoord.CHUNK_SIZE - 1) * 0.5f,
+                        (ChunkCoord.CHUNK_SIZE - 1) * 0.5f,
+                        (ChunkCoord.CHUNK_SIZE - 1) * 0.5f
+                    );
+
+                    Gizmos.DrawWireCube(worldPos, Vector3.one * ChunkCoord.CHUNK_SIZE);
+                }
+            }
+        }
+    }
+
+    #endregion
+}
--- a/Assets/Scripts/Underground/ChunkedUndergroundGenerator.cs.meta
+++ b/Assets/Scripts/Underground/ChunkedUndergroundGenerator.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 3d90f6724f14d49489261782c9672f11
--- a/Assets/Scripts/Underground/MineableChunk.cs
+++ b/Assets/Scripts/Underground/MineableChunk.cs
@@ -0,0 +1,680 @@
+using System.Collections;
+using Unity.Netcode;
+using UnityEngine;
+
+/// <summary>
+/// NetworkBehaviour for a mineable chunk containing 4x4x4 blocks.
+/// Manages block state, mesh generation, damage, and item drops.
+/// </summary>
+[RequireComponent(typeof(MeshFilter))]
+[RequireComponent(typeof(MeshRenderer))]
+[RequireComponent(typeof(MeshCollider))]
+public class MineableChunk : NetworkBehaviour, ChunkMeshBuilder.INeighborProvider
+{
+    [Header("Block Settings")]
+    [SerializeField] private byte normalBlockHealth = 100;
+    [SerializeField] private byte resourceBlockHealth = 150;
+
+    [Header("Drop Settings")]
+    [SerializeField] private ItemData normalDropItem;
+    [SerializeField] private ItemData resourceDropItem;
+    [SerializeField] private GameObject genericDropPrefab;
+
+    [Header("Materials")]
+    [SerializeField] private Material normalBlockMaterial;
+    [SerializeField] private Material resourceBlockMaterial;
+
+    [Header("Visual Settings")]
+    [SerializeField] private float meshRebuildDelay = 0.1f;
+
+    [Header("Highlight Settings")]
+    [SerializeField] private Material highlightMaterial;
+    private GameObject _highlightCube;
+    private MeshRenderer _highlightRenderer;
+
+    [Header("Fog of War")]
+    [SerializeField] private float visibilityTimeout = 0.5f; // Time before block goes from "visible" to "discovered"
+    [SerializeField] private Color discoveredTint = new Color(0.3f, 0.3f, 0.3f, 1f); // Darkened color for discovered-but-not-visible
+    private float[] _blockVisibilityTime; // Last time each block was visible (local only)
+    private MaterialPropertyBlock _propBlock;
+
+    // Chunk state synced to all clients
+    private NetworkVariable<ChunkState> _networkState = new NetworkVariable<ChunkState>(
+        default,
+        NetworkVariableReadPermission.Everyone,
+        NetworkVariableWritePermission.Server
+    );
+
+    // Local cache for quick access
+    private ChunkState _localState;
+    private ChunkCoord _chunkCoord;
+    private bool _isInitialized = false;
+
+    // Components
+    private MeshFilter _meshFilter;
+    private MeshRenderer _meshRenderer;
+    private MeshCollider _meshCollider;
+    private Outline _outline;
+
+    // Mesh rebuild state
+    private bool _meshDirty = false;
+    private Coroutine _rebuildCoroutine;
+
+    // Highlight state
+    private int _highlightedBlockIndex = -1;
+
+    // Reference to chunk manager for neighbor queries
+    private static ChunkedUndergroundGenerator _chunkManager;
+
+    public ChunkCoord Coord => _chunkCoord;
+    public ChunkState State => _localState;
+
+    // Visibility check interval
+    private float _lastVisibilityCheck;
+    private const float VISIBILITY_CHECK_INTERVAL = 0.3f;
+    private bool _hasVisibleBlocks = false;
+
+    private void Awake()
+    {
+        _meshFilter = GetComponent<MeshFilter>();
+        _meshRenderer = GetComponent<MeshRenderer>();
+        _meshCollider = GetComponent<MeshCollider>();
+        _outline = GetComponent<Outline>();
+
+        // Initialize local state
+        _localState = ChunkState.CreateEmpty();
+
+        // Initialize visibility tracking (local only, not networked)
+        _blockVisibilityTime = new float[ChunkState.BLOCKS_PER_CHUNK];
+        _propBlock = new MaterialPropertyBlock();
+
+        // Set materials: 0=normal-visible, 1=resource-visible, 2=normal-dark, 3=resource-dark
+        SetupMaterials();
+
+        // Create highlight cube for per-block highlighting
+        CreateHighlightCube();
+    }
+
+    private void SetupMaterials()
+    {
+        if (normalBlockMaterial != null && resourceBlockMaterial != null)
+        {
+            // Create darkened versions of materials for discovered-but-not-visible state
+            Material normalDark = new Material(normalBlockMaterial);
+            ApplyDarkTint(normalDark, normalBlockMaterial);
+
+            Material resourceDark = new Material(resourceBlockMaterial);
+            ApplyDarkTint(resourceDark, resourceBlockMaterial);
+
+            _meshRenderer.materials = new Material[]
+            {
+                normalBlockMaterial,   // Submesh 0: Normal blocks (visible)
+                resourceBlockMaterial, // Submesh 1: Resource blocks (visible)
+                normalDark,            // Submesh 2: Normal blocks (discovered/dark)
+                resourceDark           // Submesh 3: Resource blocks (discovered/dark)
+            };
+        }
+    }
+
+    private void ApplyDarkTint(Material darkMat, Material sourceMat)
+    {
+        // Try URP _BaseColor first, then fallback to _Color
+        if (sourceMat.HasProperty("_BaseColor"))
+        {
+            Color baseColor = sourceMat.GetColor("_BaseColor");
+            darkMat.SetColor("_BaseColor", baseColor * discoveredTint);
+        }
+        else if (sourceMat.HasProperty("_Color"))
+        {
+            Color baseColor = sourceMat.GetColor("_Color");
+            darkMat.SetColor("_Color", baseColor * discoveredTint);
+        }
+    }
+
+    private void CreateHighlightCube()
+    {
+        _highlightCube = GameObject.CreatePrimitive(PrimitiveType.Cube);
+        _highlightCube.name = "BlockHighlight";
+        _highlightCube.transform.SetParent(transform);
+        _highlightCube.transform.localScale = Vector3.one * 1.02f; // Slightly larger than block
+
+        // Remove collider - this is visual only
+        var collider = _highlightCube.GetComponent<Collider>();
+        if (collider != null) Destroy(collider);
+
+        // Setup renderer
+        _highlightRenderer = _highlightCube.GetComponent<MeshRenderer>();
+        if (highlightMaterial != null)
+        {
+            _highlightRenderer.material = highlightMaterial;
+        }
+        else
+        {
+            // Create default highlight material if none assigned
+            var mat = new Material(Shader.Find("Standard"));
+            mat.color = new Color(1f, 1f, 0f, 0.3f); // Yellow transparent
+            mat.SetFloat("_Mode", 3); // Transparent mode
+            mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
+            mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
+            mat.SetInt("_ZWrite", 0);
+            mat.DisableKeyword("_ALPHATEST_ON");
+            mat.EnableKeyword("_ALPHABLEND_ON");
+            mat.DisableKeyword("_ALPHAPREMULTIPLY_ON");
+            mat.renderQueue = 3000;
+            _highlightRenderer.material = mat;
+        }
+
+        _highlightCube.SetActive(false);
+    }
+
+    public override void OnNetworkSpawn()
+    {
+        // Calculate chunk coordinates from world position
+        _chunkCoord = ChunkCoord.FromWorldPos(transform.position);
+
+        // Subscribe to state changes
+        _networkState.OnValueChanged += OnChunkStateChanged;
+
+        // Initial sync
+        SyncLocalState();
+        RebuildMeshImmediate();
+
+        // Find chunk manager if not set
+        if (_chunkManager == null)
+        {
+            _chunkManager = FindFirstObjectByType<ChunkedUndergroundGenerator>();
+        }
+    }
+
+    private void Update()
+    {
+        // Only check visibility timeout periodically and if we had visible blocks
+        if (!_hasVisibleBlocks) return;
+        if (Time.time - _lastVisibilityCheck < VISIBILITY_CHECK_INTERVAL) return;
+
+        _lastVisibilityCheck = Time.time;
+        CheckVisibilityTimeout();
+    }
+
+    private void CheckVisibilityTimeout()
+    {
+        bool anyStillVisible = false;
+        bool needsRebuild = false;
+
+        for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+        {
+            if (_blockVisibilityTime[i] <= 0) continue;
+
+            bool wasVisible = (Time.time - _blockVisibilityTime[i]) < visibilityTimeout;
+
+            if (wasVisible)
+            {
+                anyStillVisible = true;
+            }
+            else if (_blockVisibilityTime[i] > 0)
+            {
+                // Block just transitioned from visible to discovered
+                // Check if it was visible last frame (within timeout + check interval)
+                float timeSinceVisible = Time.time - _blockVisibilityTime[i];
+                if (timeSinceVisible < visibilityTimeout + VISIBILITY_CHECK_INTERVAL * 2)
+                {
+                    needsRebuild = true;
+                }
+            }
+        }
+
+        _hasVisibleBlocks = anyStillVisible;
+
+        if (needsRebuild)
+        {
+            ScheduleMeshRebuild();
+        }
+    }
+
+    public override void OnNetworkDespawn()
+    {
+        _networkState.OnValueChanged -= OnChunkStateChanged;
+    }
+
+    /// <summary>
+    /// Initialize chunk with generated block data (called by generator on server)
+    /// </summary>
+    public void InitializeBlocks(ChunkState initialState)
+    {
+        if (!IsServer) return;
+
+        _networkState.Value = initialState;
+        SyncLocalState();
+        RebuildMeshImmediate();
+    }
+
+    /// <summary>
+    /// Get block data at local coordinates
+    /// </summary>
+    public BlockData GetBlock(int x, int y, int z)
+    {
+        if (!ChunkCoord.IsValidLocal(x, y, z)) return BlockData.Empty;
+        if (_localState.blocks == null) return BlockData.Empty;
+        int index = ChunkCoord.LocalToIndex(x, y, z);
+        return _localState.blocks[index];
+    }
+
+    /// <summary>
+    /// Get block data at local index
+    /// </summary>
+    public BlockData GetBlock(int index)
+    {
+        if (index < 0 || index >= ChunkState.BLOCKS_PER_CHUNK) return BlockData.Empty;
+        if (_localState.blocks == null) return BlockData.Empty;
+        return _localState.blocks[index];
+    }
+
+    #region Damage System
+
+    /// <summary>
+    /// Request damage to a specific block (called by clients)
+    /// </summary>
+    [Rpc(SendTo.Server)]
+    public void DamageBlockServerRpc(int localIndex, byte damage)
+    {
+        if (localIndex < 0 || localIndex >= ChunkState.BLOCKS_PER_CHUNK) return;
+
+        var state = _networkState.Value;
+        BlockData block = state.blocks[localIndex];
+
+        if (block.IsEmpty) return;
+
+        // Apply damage
+        int newHealth = Mathf.Max(0, block.health - damage);
+        block.health = (byte)newHealth;
+
+        // Update state
+        state.blocks[localIndex] = block;
+        _networkState.Value = state;
+
+        // Sync to clients
+        UpdateBlockClientRpc(localIndex, block);
+
+        // Play hit effect
+        PlayHitEffectClientRpc(localIndex);
+
+        // Check for destruction
+        if (newHealth <= 0)
+        {
+            DestroyBlock(localIndex, state.blocks[localIndex].blockType);
+        }
+    }
+
+    /// <summary>
+    /// Server-side damage application (for direct server calls)
+    /// </summary>
+    public void DamageBlock(int localIndex, float damageAmount)
+    {
+        if (!IsServer) return;
+        DamageBlockServerRpc(localIndex, (byte)Mathf.Min(255, damageAmount));
+    }
+
+    /// <summary>
+    /// Update a single block on all clients
+    /// </summary>
+    [ClientRpc]
+    private void UpdateBlockClientRpc(int localIndex, BlockData block)
+    {
+        if (localIndex < 0 || localIndex >= ChunkState.BLOCKS_PER_CHUNK) return;
+
+        _localState.blocks[localIndex] = block;
+
+        // Schedule mesh rebuild
+        ScheduleMeshRebuild();
+    }
+
+    /// <summary>
+    /// Play hit visual effect
+    /// </summary>
+    [ClientRpc]
+    private void PlayHitEffectClientRpc(int localIndex)
+    {
+        // Get block world position for effect
+        Vector3Int localPos = ChunkCoord.IndexToLocal(localIndex);
+        Vector3 worldPos = _chunkCoord.LocalToWorld(localPos);
+
+        // TODO: Spawn particle effect at worldPos
+        // For now, just a debug visualization
+    }
+
+    /// <summary>
+    /// Handle block destruction (server-side)
+    /// </summary>
+    private void DestroyBlock(int localIndex, byte blockType)
+    {
+        if (!IsServer) return;
+
+        // Spawn dropped item
+        Vector3Int localPos = ChunkCoord.IndexToLocal(localIndex);
+        Vector3 worldPos = _chunkCoord.LocalToWorld(localPos);
+        SpawnDrop(worldPos, blockType);
+
+        // Clear block
+        var state = _networkState.Value;
+        state.blocks[localIndex] = BlockData.Empty;
+        _networkState.Value = state;
+
+        // Full sync and rebuild
+        SyncStateClientRpc(state);
+    }
+
+    /// <summary>
+    /// Spawn item drop at position
+    /// </summary>
+    private void SpawnDrop(Vector3 position, byte blockType)
+    {
+        if (genericDropPrefab == null) return;
+
+        ItemData dropItem = blockType == BlockData.TYPE_RESOURCE ? resourceDropItem : normalDropItem;
+        if (dropItem == null) return;
+
+        GameObject dropObj = Instantiate(genericDropPrefab, position + Vector3.up * 0.5f, Quaternion.identity);
+        NetworkObject netObj = dropObj.GetComponent<NetworkObject>();
+        netObj.Spawn();
+
+        if (dropObj.TryGetComponent<DroppedItem>(out var droppedItem))
+        {
+            droppedItem.Initialize(dropItem.itemID);
+        }
+    }
+
+    #endregion
+
+    #region Fog of War
+
+    /// <summary>
+    /// Check if block is currently visible (in player's sight right now)
+    /// </summary>
+    public bool IsBlockCurrentlyVisible(int localIndex)
+    {
+        if (_blockVisibilityTime == null || localIndex < 0 || localIndex >= _blockVisibilityTime.Length)
+            return false;
+        return (Time.time - _blockVisibilityTime[localIndex]) < visibilityTimeout;
+    }
+
+    /// <summary>
+    /// Update local visibility for blocks in range (called by local player)
+    /// </summary>
+    public void UpdateLocalVisibility(Vector3 playerPos, float radius)
+    {
+        bool needsRebuild = false;
+        bool anyVisible = false;
+
+        for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+        {
+            BlockData block = _localState.blocks[i];
+            if (block.IsEmpty || !block.IsDiscovered) continue;
+
+            Vector3 blockWorldPos = GetBlockWorldPosition(i);
+            bool wasVisible = IsBlockCurrentlyVisible(i);
+
+            if (Vector3.Distance(playerPos, blockWorldPos) <= radius)
+            {
+                _blockVisibilityTime[i] = Time.time;
+                anyVisible = true;
+
+                // If block just became visible, need to rebuild mesh
+                if (!wasVisible)
+                {
+                    needsRebuild = true;
+                }
+            }
+        }
+
+        // Track if we have any visible blocks (for timeout checking in Update)
+        _hasVisibleBlocks = anyVisible || _hasVisibleBlocks;
+
+        if (needsRebuild)
+        {
+            ScheduleMeshRebuild();
+        }
+    }
+
+    /// <summary>
+    /// Request reveal of a specific block (called by clients)
+    /// </summary>
+    [Rpc(SendTo.Server)]
+    public void RevealBlockServerRpc(int localIndex)
+    {
+        if (localIndex < 0 || localIndex >= ChunkState.BLOCKS_PER_CHUNK) return;
+
+        var state = _networkState.Value;
+        BlockData block = state.blocks[localIndex];
+
+        if (block.IsEmpty || block.IsDiscovered) return;
+
+        // Mark as discovered
+        block.IsDiscovered = true;
+        state.blocks[localIndex] = block;
+        _networkState.Value = state;
+
+        // Sync to clients
+        UpdateBlockClientRpc(localIndex, block);
+    }
+
+    /// <summary>
+    /// Reveal all blocks within radius of a world position
+    /// </summary>
+    public void RevealBlocksInRadius(Vector3 worldPos, float radius)
+    {
+        if (!IsServer) return;
+
+        bool anyRevealed = false;
+        var state = _networkState.Value;
+
+        for (int i = 0; i < ChunkState.BLOCKS_PER_CHUNK; i++)
+        {
+            BlockData block = state.blocks[i];
+            if (block.IsEmpty || block.IsDiscovered) continue;
+
+            Vector3Int localPos = ChunkCoord.IndexToLocal(i);
+            Vector3 blockWorldPos = _chunkCoord.LocalToWorld(localPos);
+
+            if (Vector3.Distance(worldPos, blockWorldPos) <= radius)
+            {
+                block.IsDiscovered = true;
+                state.blocks[i] = block;
+                anyRevealed = true;
+            }
+        }
+
+        if (anyRevealed)
+        {
+            _networkState.Value = state;
+            SyncStateClientRpc(state);
+        }
+    }
+
+    /// <summary>
+    /// Check if block at local index is discovered
+    /// </summary>
+    public bool IsBlockDiscovered(int localIndex)
+    {
+        if (localIndex < 0 || localIndex >= ChunkState.BLOCKS_PER_CHUNK) return false;
+        return _localState.blocks[localIndex].IsDiscovered;
+    }
+
+    #endregion
+
+    #region Mesh Building
+
+    /// <summary>
+    /// Full state sync from server
+    /// </summary>
+    [ClientRpc]
+    private void SyncStateClientRpc(ChunkState state)
+    {
+        _localState = state;
+        RebuildMeshImmediate();
+    }
+
+    private void OnChunkStateChanged(ChunkState oldState, ChunkState newState)
+    {
+        SyncLocalState();
+        ScheduleMeshRebuild();
+    }
+
+    private void SyncLocalState()
+    {
+        _localState = _networkState.Value;
+        // Ensure blocks array is initialized
+        if (_localState.blocks == null)
+        {
+            _localState = ChunkState.CreateEmpty();
+        }
+    }
+
+    private void ScheduleMeshRebuild()
+    {
+        if (_meshDirty) return;
+        _meshDirty = true;
+
+        if (_rebuildCoroutine != null)
+        {
+            StopCoroutine(_rebuildCoroutine);
+        }
+        _rebuildCoroutine = StartCoroutine(DelayedMeshRebuild());
+    }
+
+    private IEnumerator DelayedMeshRebuild()
+    {
+        yield return new WaitForSeconds(meshRebuildDelay);
+        RebuildMeshImmediate();
+        _meshDirty = false;
+        _rebuildCoroutine = null;
+    }
+
+    private void RebuildMeshImmediate()
+    {
+        if (_meshFilter == null) return;
+
+        // Build visual mesh with fog of war (4 submeshes: normal-visible, resource-visible, normal-dark, resource-dark)
+        Mesh visualMesh = ChunkMeshBuilder.BuildMeshWithVisibility(
+            _localState,
+            _chunkCoord,
+            this,
+            true, // only discovered
+            IsBlockCurrentlyVisible // visibility checker
+        );
+        _meshFilter.mesh = visualMesh;
+
+        // Build collision mesh (all blocks, including undiscovered, no visibility distinction)
+        if (_meshCollider != null)
+        {
+            Mesh collisionMesh = ChunkMeshBuilder.BuildMesh(_localState, _chunkCoord, this, false);
+            _meshCollider.sharedMesh = null; // Force refresh
+            _meshCollider.sharedMesh = collisionMesh;
+        }
+    }
+
+    #endregion
+
+    #region INeighborProvider Implementation
+
+    /// <summary>
+    /// Check if block at world grid position is solid (for cross-chunk face culling)
+    /// </summary>
+    public bool IsBlockSolid(Vector3Int gridPos)
+    {
+        // Check if position is in this chunk
+        ChunkCoord coord = ChunkCoord.FromGridPos(gridPos);
+        if (coord == _chunkCoord)
+        {
+            Vector3Int local = ChunkCoord.GridToLocal(gridPos);
+            int index = ChunkCoord.LocalToIndex(local);
+            var block = _localState.blocks[index];
+            return !block.IsEmpty && block.IsDiscovered;
+        }
+
+        // Query chunk manager for other chunks
+        if (_chunkManager != null)
+        {
+            return _chunkManager.IsBlockSolid(gridPos);
+        }
+
+        // Default: assume not solid at chunk boundaries
+        return false;
+    }
+
+    #endregion
+
+    #region Interaction Support
+
+    /// <summary>
+    /// Convert world hit point to local block index
+    /// </summary>
+    public int WorldPointToBlockIndex(Vector3 worldPoint)
+    {
+        // Convert world point to local space relative to chunk transform
+        Vector3 localPoint = transform.InverseTransformPoint(worldPoint);
+
+        // Each block is 1 unit, centered at integer coordinates
+        // So block at (0,0,0) spans from -0.5 to 0.5
+        int lx = Mathf.Clamp(Mathf.RoundToInt(localPoint.x), 0, ChunkCoord.CHUNK_SIZE - 1);
+        int ly = Mathf.Clamp(Mathf.RoundToInt(localPoint.y), 0, ChunkCoord.CHUNK_SIZE - 1);
+        int lz = Mathf.Clamp(Mathf.RoundToInt(localPoint.z), 0, ChunkCoord.CHUNK_SIZE - 1);
+
+        return ChunkCoord.LocalToIndex(lx, ly, lz);
+    }
+
+    /// <summary>
+    /// Get world position of block at local index
+    /// </summary>
+    public Vector3 GetBlockWorldPosition(int localIndex)
+    {
+        Vector3Int localPos = ChunkCoord.IndexToLocal(localIndex);
+        // Convert local position to world using chunk transform
+        return transform.TransformPoint(new Vector3(localPos.x, localPos.y, localPos.z));
+    }
+
+    /// <summary>
+    /// Set highlight state for visual feedback
+    /// </summary>
+    public void SetHighlight(bool isOn, int blockIndex = -1)
+    {
+        _highlightedBlockIndex = isOn ? blockIndex : -1;
+
+        // Use per-block highlight cube instead of outline
+        if (_highlightCube != null)
+        {
+            if (isOn && blockIndex >= 0)
+            {
+                // Position highlight at specific block
+                Vector3Int localPos = ChunkCoord.IndexToLocal(blockIndex);
+                _highlightCube.transform.localPosition = new Vector3(localPos.x, localPos.y, localPos.z);
+                _highlightCube.SetActive(true);
+            }
+            else
+            {
+                _highlightCube.SetActive(false);
+            }
+        }
+
+        // Disable outline component if present (we use highlight cube instead)
+        if (_outline != null)
+        {
+            _outline.enabled = false;
+        }
+    }
+
+    /// <summary>
+    /// Get the currently highlighted block index
+    /// </summary>
+    public int HighlightedBlockIndex => _highlightedBlockIndex;
+
+    #endregion
+
+    #region Static Registration
+
+    public static void SetChunkManager(ChunkedUndergroundGenerator manager)
+    {
+        _chunkManager = manager;
+    }
+
+    #endregion
+}
--- a/Assets/Scripts/Underground/MineableChunk.cs.meta
+++ b/Assets/Scripts/Underground/MineableChunk.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 53bb340e9008b024ba035f6ee8fa21a4