(Feat) Add Remove Building

Assets/GAME/Script/Building/BuildManager.cs

@@ -62,6 +62,13 @@ namespace Ashwild.Building
         [Tooltip("Layers that block a build (structures, props, players). Must NOT include the ground.")]
         [SerializeField] private LayerMask obstructionMask;
 
+        [Header("Demolition")]
+        [Tooltip("Layers the demolition aim can hit to target a committed structure. Narrow this to the structures' layer so walls, roofs, etc. are the only demolishable hits.")]
+        [SerializeField] private LayerMask buildMask = ~0;
+
+        [Tooltip("Overlay material added on top of the aimed build while it is the demolition target (e.g. a translucent red 'about to break' pass). Should be a transparent/additive material since it draws over the model.")]
+        [SerializeField] private Material demolitionMaterial;
+
         #endregion
 
         #region State
@@ -95,10 +102,16 @@ namespace Ashwild.Building
         private float yaw;
 
         /// <summary>
-        /// The local player's aim transform (camera), resolved when the ghost is attached.
+        /// The local player's aim transform (camera), resolved lazily and shared by placement and
+        /// demolition.
         /// </summary>
         private Transform aim;
 
+        /// <summary>
+        /// The committed build currently under the demolition aim, or null when none is targeted.
+        /// </summary>
+        private BuiltStructure demoTarget;
+
         /// <summary>
         /// Frame the ghost was attached, so a click landing that frame never confirms instantly.
         /// </summary>
@@ -141,6 +154,8 @@ namespace Ashwild.Building
             PlayerEvents.AttackPressed += HandleConfirm;
             PlayerEvents.SecondaryUsePressed += HandleCancel;
             PlayerEvents.HotbarScroll += HandleRotate;
+            PlayerEvents.BuildRotatePressed += HandleRotateKey;
+            PlayerEvents.DemolishModeChanged += HandleDemolishModeChanged;
         }
 
         /// <summary>
@@ -152,16 +167,27 @@ namespace Ashwild.Building
             PlayerEvents.AttackPressed -= HandleConfirm;
             PlayerEvents.SecondaryUsePressed -= HandleCancel;
             PlayerEvents.HotbarScroll -= HandleRotate;
+            PlayerEvents.BuildRotatePressed -= HandleRotateKey;
+            PlayerEvents.DemolishModeChanged -= HandleDemolishModeChanged;
 
             EndPlacement();
+            ClearDemoTarget();
         }
 
         /// <summary>
-        /// Drives the owned ghost along the aim each frame; frozen while input is locked (e.g. the
-        /// menu was reopened over an active placement).
+        /// Each frame, in exactly one mode: in demolition mode it tracks which build the player aims
+        /// at; otherwise it drives the owned ghost along the aim. Both are frozen while input is locked
+        /// (e.g. the menu reopened over a placement), and leaving demolition mode clears the target.
         /// </summary>
         private void Update()
         {
+            if (PlayerEvents.IsDemolishing && !PlayerEvents.InputLocked)
+            {
+                UpdateDemolitionTarget();
+                return;
+            }
+            ClearDemoTarget();
+
             if (ghost == null) return;
             if (PlayerEvents.InputLocked) return;
 
@@ -268,9 +294,7 @@ namespace Ashwild.Building
             ghost = go;
             ghostValidity = go.GetComponentInChildren<BuildGhost>(true);
             ghostSnaps = go.GetComponentsInChildren<BuildSnapPoint>(true);
-            aim = aimCamera != null ? aimCamera.transform : (Camera.main != null ? Camera.main.transform : null);
-            if (aim == null)
-                Debug.LogError("[BuildManager] Pas de caméra d'aim (Camera.main introuvable — la caméra du joueur est-elle taguée MainCamera ?).", this);
+            ResolveAim();
 
             placementBeganFrame = Time.frameCount;
             UpdateGhostPose();
@@ -278,11 +302,18 @@ namespace Ashwild.Building
         }
 
         /// <summary>
-        /// Left-click: commits the ghost's pose to the registry (spawned for everyone) and ends the
-        /// placement. Blocked on an invalid spot and on the very frame the ghost was attached.
+        /// Left-click: demolishes the aimed build while in demolition mode, otherwise commits the
+        /// ghost's pose to the registry (spawned for everyone) and ends the placement. Placement is
+        /// blocked on an invalid spot and on the very frame the ghost was attached.
         /// </summary>
         private void HandleConfirm()
         {
+            if (PlayerEvents.IsDemolishing)
+            {
+                TryDemolish();
+                return;
+            }
+
             if (ghost == null) return;
             if (PlayerEvents.InputLocked) return;
             if (Time.frameCount == placementBeganFrame) return;
@@ -316,6 +347,18 @@ namespace Ashwild.Building
             else if (scroll < 0f) yaw -= rotationStep;
         }
 
+        /// <summary>
+        /// R key: yaws the ghost by one rotation step in the same direction as a scroll-up, so the
+        /// build can be turned without the mouse wheel. Ignored when no ghost is being placed.
+        /// </summary>
+        private void HandleRotateKey()
+        {
+            if (ghost == null) return;
+            if (PlayerEvents.InputLocked) return;
+
+            yaw += rotationStep;
+        }
+
         /// <summary>
         /// Poses the ghost each frame: quantise the aim hit to the grid with the current yaw, then
         /// let a nearby matching socket pull it into an exact connection (sockets win over the grid).
@@ -410,6 +453,76 @@ namespace Ashwild.Building
             }
         }
 
+        /// <summary>
+        /// Resolves and caches the local player's aim transform — the assigned camera, else the
+        /// runtime Camera.main (the FPS camera). Logs once when neither is found.
+        /// </summary>
+        private Transform ResolveAim()
+        {
+            if (aim != null) return aim;
+
+            aim = aimCamera != null ? aimCamera.transform : (Camera.main != null ? Camera.main.transform : null);
+            if (aim == null)
+                Debug.LogError("[BuildManager] Pas de caméra d'aim (Camera.main introuvable — la caméra du joueur est-elle taguée MainCamera ?).", this);
+            return aim;
+        }
+
+        #endregion
+
+        #region Demolition
+
+        /// <summary>
+        /// Leaving demolition mode drops any current target so the crosshair returns to normal; entering
+        /// it needs nothing here — Update starts tracking on the next frame.
+        /// </summary>
+        private void HandleDemolishModeChanged(bool on)
+        {
+            if (!on) ClearDemoTarget();
+        }
+
+        /// <summary>
+        /// Casts the aim ray for a committed build and moves the demolition highlight when the target
+        /// changes: the previous build removes its overlay and the new one gets the demolition material
+        /// added on top, so exactly the aimed build reads as "about to break".
+        /// </summary>
+        private void UpdateDemolitionTarget()
+        {
+            Transform a = ResolveAim();
+            if (a == null) { ClearDemoTarget(); return; }
+
+            BuiltStructure hit = null;
+            if (Physics.Raycast(a.position, a.forward, out RaycastHit info, placeRange, buildMask, QueryTriggerInteraction.Ignore))
+                hit = info.collider.GetComponentInParent<BuiltStructure>();
+
+            if (hit == demoTarget) return;
+
+            if (demoTarget != null) demoTarget.ClearHighlight();
+            demoTarget = hit;
+            if (demoTarget != null) demoTarget.Highlight(demolitionMaterial);
+        }
+
+        /// <summary>
+        /// Left-click while demolishing: asks the registry to remove the aimed build for everyone. The
+        /// target stays until the next frame re-evaluates, so a miss simply retargets.
+        /// </summary>
+        private void TryDemolish()
+        {
+            if (demoTarget == null) return;
+            if (BuildRegistry.Instance != null)
+                BuildRegistry.Instance.RequestDemolish(demoTarget.gameObject);
+        }
+
+        /// <summary>
+        /// Drops the current demolition target, restoring its authored materials. Safe to call when
+        /// nothing is targeted.
+        /// </summary>
+        private void ClearDemoTarget()
+        {
+            if (demoTarget == null) return;
+            demoTarget.ClearHighlight();
+            demoTarget = null;
+        }
+
         #endregion
     }
 }

Assets/GAME/Script/Building/BuildRegistry.cs

@@ -99,6 +99,43 @@ namespace Ashwild.Building
 
         #endregion
 
+        #region Demolish Build
+
+        /// <summary>
+        /// Called by BuildManager when the local player demolishes a build they aimed at: resolves the
+        /// hit instance to its index in the replicated list and asks the server to remove it. The index
+        /// is a valid shared key because <see cref="spawned"/> stays aligned with <see cref="builds"/>
+        /// on every machine. No-op when the object is not one of our committed builds.
+        /// </summary>
+        public void RequestDemolish(GameObject builtInstance)
+        {
+            if (builtInstance == null) return;
+
+            int index = spawned.IndexOf(builtInstance);
+            if (index < 0)
+            {
+                Debug.LogWarning($"[BuildRegistry] '{builtInstance.name}' is not a committed build — nothing to demolish.", this);
+                return;
+            }
+            RequestDemolishServerRpc(index);
+        }
+
+        /// <summary>
+        /// Server-side: removes the record at this index, which replicates the removal (and the local
+        /// teardown + occupancy refresh) to every client. Range-guarded against a stale index from a
+        /// build that another player demolished during the round-trip.
+        /// </summary>
+        [ServerRpc(RequireOwnership = false)]
+        private void RequestDemolishServerRpc(int index, NetworkConnection conn = null)
+        {
+            if (index < 0 || index >= builds.Count) return;
+
+            // TODO: refund the builder's resources (conn → PlayerInventory) once build cost lands.
+            builds.RemoveAt(index);
+        }
+
+        #endregion
+
         #region Networked Ghost Preview
 
         /// <summary>
@@ -187,6 +224,7 @@ namespace Ashwild.Building
                 case SyncListOperation.RemoveAt:
                     DestroyAt(index);
                     spawned.RemoveAt(index);
+                    RecomputeOccupancy();
                     break;
 
                 case SyncListOperation.Clear:
@@ -210,7 +248,10 @@ namespace Ashwild.Building
                 Debug.LogWarning($"[BuildRegistry] Buildable id {record.buildableId} introuvable ou sans BuiltPrefab — rien de spawné.", this);
                 return null;
             }
-            return Instantiate(data.BuiltPrefab, record.position, record.rotation);
+
+            GameObject go = Instantiate(data.BuiltPrefab, record.position, record.rotation);
+            if (go.GetComponent<BuiltStructure>() == null) go.AddComponent<BuiltStructure>();
+            return go;
         }
 
         /// <summary>
@@ -246,6 +287,24 @@ namespace Ashwild.Building
                 MarkOccupancy(go);
         }
 
+        /// <summary>
+        /// Recomputes occupancy from scratch after a removal: clears every socket, then re-marks the
+        /// connected pairs across what remains. Without this a demolished piece would leave its former
+        /// neighbours' sockets stuck "occupied", so nothing could ever be snapped back into the gap.
+        /// </summary>
+        private void RecomputeOccupancy()
+        {
+            foreach (GameObject go in spawned)
+            {
+                if (go == null) continue;
+                foreach (BuildSnapPoint sp in go.GetComponentsInChildren<BuildSnapPoint>(true))
+                    sp.SetOccupied(false);
+            }
+
+            foreach (GameObject go in spawned)
+                MarkOccupancy(go);
+        }
+
         /// <summary>
         /// Marks the sockets a piece shares a position with — and the matching sockets on the pieces
         /// it touches — as occupied, so placement snapping skips them. Occupancy is derived purely

Assets/GAME/Script/Building/BuiltStructure.cs

@@ -0,0 +1,91 @@
+using UnityEngine;
+
+namespace Ashwild.Building
+{
+    /// <summary>
+    /// Runtime marker added to every committed structure instance the BuildRegistry spawns, so the
+    /// demolition aim can recognise a build from a raycast hit (GetComponentInParent) and hand its
+    /// root back to the registry to remove. It also owns the demolition highlight: while it is the
+    /// hammer's target the demolition material is added on top of every renderer (an extra overlay
+    /// pass, like the ghost), and removed again when the aim leaves — so the player sees exactly which
+    /// build will break. Pure local visual + a pure tag: nothing about it ever crosses the wire.
+    /// </summary>
+    [DisallowMultipleComponent]
+    public class BuiltStructure : MonoBehaviour
+    {
+        #region State
+
+        /// <summary>
+        /// Every child renderer, cached so the highlight can swap and restore their materials.
+        /// </summary>
+        private Renderer[] renderers;
+
+        /// <summary>
+        /// Each renderer's original materials, kept so the swap is fully reversible.
+        /// </summary>
+        private Material[][] baseMaterials;
+
+        /// <summary>
+        /// Whether the demolition material is currently applied, so swaps stay idempotent.
+        /// </summary>
+        private bool highlighted;
+
+        #endregion
+
+        #region Unity Lifecycle
+
+        /// <summary>
+        /// Caches every child renderer and its authored materials up front so highlighting is a cheap
+        /// array assignment with no per-frame allocation of the base look.
+        /// </summary>
+        private void Awake()
+        {
+            renderers = GetComponentsInChildren<Renderer>(true);
+            baseMaterials = new Material[renderers.Length][];
+            for (int i = 0; i < renderers.Length; i++)
+                baseMaterials[i] = renderers[i] != null ? renderers[i].sharedMaterials : new Material[0];
+        }
+
+        #endregion
+
+        #region Public API
+
+        /// <summary>
+        /// Adds the demolition material on top of each renderer's authored materials (an extra draw
+        /// pass), marking this build as the hammer's current target without hiding the model. Mirrors
+        /// the ghost overlay. No-op when already highlighted or no material was provided.
+        /// </summary>
+        public void Highlight(Material demolitionMaterial)
+        {
+            if (highlighted || demolitionMaterial == null) return;
+            highlighted = true;
+
+            for (int i = 0; i < renderers.Length; i++)
+            {
+                Renderer r = renderers[i];
+                if (r == null) continue;
+
+                Material[] baseMats = baseMaterials[i];
+                Material[] combined = new Material[baseMats.Length + 1];
+                for (int j = 0; j < baseMats.Length; j++) combined[j] = baseMats[j];
+                combined[baseMats.Length] = demolitionMaterial;
+
+                r.materials = combined;
+            }
+        }
+
+        /// <summary>
+        /// Restores each renderer's authored materials. No-op when not highlighted.
+        /// </summary>
+        public void ClearHighlight()
+        {
+            if (!highlighted) return;
+            highlighted = false;
+
+            for (int i = 0; i < renderers.Length; i++)
+                if (renderers[i] != null) renderers[i].materials = baseMaterials[i];
+        }
+
+        #endregion
+    }
+}

Assets/GAME/Script/Building/BuiltStructure.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: fe38331f524a7db4cb3d53381b9ea244