Feature: per-tower construction-phase build bisuals

Adding the correct pipeline for creating the different building phases for towers. Adding a default set with primitive cubes.

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Assets/_Project/Prefabs/Towers/Tower Construction Sets/BuildSiteVisual.prefab

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   pausedMaterial: {fileID: 0}
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   stageCount: 4
   queuedYScale: 0.15
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Assets/_Project/Scripts/Gameplay/BuildSiteVisual.cs

@@ -1,5 +1,4 @@
 // Assets/_Project/Scripts/Gameplay/BuildSiteVisual.cs
-using Unity.Collections;
 using Unity.Netcode;
 using UnityEngine;
 using TD.Core;
@@ -63,27 +62,25 @@ namespace TD.Gameplay
                  "Suggested: muted/grey-tinted variant of the constructing material.")]
         [SerializeField] private Material pausedMaterial;
 
-        [Header("Construction stages")]
+        [Header("Construction phases")]
-        [Tooltip("Number of discrete growth stages while constructing. 4 matches the " +
+        [Tooltip("Project-default construction-stage visuals used when the tower being built " +
-                 "design doc (1/4 → 2/4 → 3/4 → 4/4 height).")]
+                 "doesn't define its own ConstructionPhases. When this (or the tower's set) " +
+                 "has phases, the build site swaps between those phase prefabs as it builds. " +
+                 "Leave empty to fall back to the legacy cube Y-scale growth below.")]
+        [SerializeField] private ConstructionPhaseSet defaultPhaseSet;
+
+        [Header("Construction stages (cube fallback)")]
+        [Tooltip("FALLBACK ONLY (no phase set assigned): number of discrete growth stages " +
+                 "while constructing. 4 = 1/4 → 2/4 → 3/4 → 4/4 height.")]
         [SerializeField] private int stageCount = 4;
 
-        [Tooltip("Y-scale applied to scaleTarget when Stage == Queued. Visually " +
+        [Tooltip("FALLBACK ONLY: Y-scale applied to scaleTarget when Stage == Queued. " +
-                 "distinct from any constructing height so the queued ghost reads as " +
+                 "Visually distinct from any constructing height so the queued ghost reads " +
-                 "'intent, not progress'.")]
+                 "as 'intent, not progress'.")]
         [SerializeField] private float queuedYScale = 0.15f;
 
         // ----- Networked state --------------------------------------------
 
-        // Replicated definition name so clients can resolve the source TowerDefinition
-        // (matches TowerInstance's pattern). Used for footprint size only — the visual
-        // prefab is the same regardless of tower type for now.
-        private readonly NetworkVariable<FixedString64Bytes> definitionName =
-            new NetworkVariable<FixedString64Bytes>(
-                default,
-                readPerm: NetworkVariableReadPermission.Everyone,
-                writePerm: NetworkVariableWritePermission.Server);
-
         // Replicated owner slot for color tinting. Mirrors TowerInstance.
         private readonly NetworkVariable<PlayerSlot> ownerSlot =
             new NetworkVariable<PlayerSlot>(
@@ -232,7 +229,6 @@ namespace TD.Gameplay
 
         // ----- Pre-spawn init data (server) -------------------------------
 
-        private string pendingDefName;
         private PlayerSlot pendingOwner = PlayerSlot.None;
         private float pendingBuildTime;
         private Vector2Int pendingAnchor;
@@ -240,6 +236,17 @@ namespace TD.Gameplay
         private int pendingGoldSpent;
         private bool hasPendingInit;
 
+        // ----- Construction-phase runtime (local, all peers) --------------
+
+        // Resolved on spawn from the tower's ConstructionPhases or the defaultPhaseSet.
+        // When non-null with PhaseCount > 0, the build site swaps between these
+        // instantiated phase prefabs instead of Y-scaling the fallback cube.
+        private ConstructionPhaseSet effectivePhaseSet;
+        private GameObject[] phaseInstances;      // one instantiated child per phase
+        private MeshRenderer[][] phaseRenderers;  // cached renderers per phase, for tinting
+        private int activePhaseIndex = -1;
+        private bool usePhases;
+
         // ----- Lifecycle --------------------------------------------------
 
         /// <summary>
@@ -261,7 +268,6 @@ namespace TD.Gameplay
                 return;
             }
 
-            pendingDefName = def != null ? def.name : string.Empty;
             pendingOwner = owner;
             pendingBuildTime = def != null ? def.BuildTime : 0f;
             pendingAnchor = anchorTile;
@@ -281,7 +287,6 @@ namespace TD.Gameplay
             // message so clients see correct values on their first OnNetworkSpawn.
             if (IsServer && hasPendingInit)
             {
-                definitionName.Value = new FixedString64Bytes(pendingDefName ?? string.Empty);
                 ownerSlot.Value = pendingOwner;
                 buildTime.Value = pendingBuildTime;
                 anchor.Value = pendingAnchor;
@@ -290,6 +295,10 @@ namespace TD.Gameplay
                 hasPendingInit = false;
             }
 
+            // Resolve and instantiate the construction-phase visuals (or fall back to the
+            // cube). Depends on towerTypeId, which is replicated by now on every peer.
+            ResolvePhaseSet();
+
             // Subscribe to value changes so visual updates are reactive.
             currentStage.OnValueChanged += HandleStageChanged;
 
@@ -344,14 +353,25 @@ namespace TD.Gameplay
 
         private void Update()
         {
-            // While constructing, smoothly interpolate Y-scale through the stages
+            // While constructing, advance the visual based on server time. Runs on every
-            // based on server time. This runs on every peer (server + clients) so
+            // peer so visuals stay synchronized. Paused does NOT update — the visual is
-            // visuals stay synchronized regardless of who's looking.
+            // frozen at the pause point.
-            // Paused stage does NOT update — Y-scale is frozen at the pause point.
             if (currentStage.Value != BuildStage.Constructing) return;
 
-            float yScale = ComputeConstructingYScale();
+            if (usePhases)
-            ApplyYScale(yScale);
+            {
+                int index = PhaseIndexFromProgress();
+                if (index != activePhaseIndex)
+                {
+                    ShowPhase(index);
+                    // Renderers changed with the swap — re-apply material + owner tint.
+                    ApplyStageMaterialAndTint(BuildStage.Constructing);
+                }
+                return;
+            }
+
+            // Fallback: smoothly grow the cube's Y-scale through the stages.
+            ApplyYScale(ComputeConstructingYScale());
         }
 
         // ----- Server API -------------------------------------------------
@@ -498,33 +518,117 @@ namespace TD.Gameplay
         }
 
         private void ApplyStageVisual(BuildStage stage)
+        {
+            if (usePhases)
+            {
+                // Queued shows the first phase; constructing/paused show the phase
+                // matching current progress. ShowPhase repoints tintedRenderers at the
+                // active phase instance, so material + tint are applied AFTER it.
+                int index = stage == BuildStage.Queued ? 0 : PhaseIndexFromProgress();
+                ShowPhase(index);
+                ApplyStageMaterialAndTint(stage);
+                return;
+            }
+
+            // Fallback: legacy cube Y-scale growth (no phase set wired).
+            ApplyStageMaterialAndTint(stage);
+            switch (stage)
+            {
+                case BuildStage.Queued:       ApplyYScale(queuedYScale); break;
+                case BuildStage.Constructing: ApplyYScale(ComputeConstructingYScale()); break;
+                // ComputePausedYScale uses accumulatedConstructionTime alone when
+                // constructionStartServerTime is -1 (the pause sentinel).
+                case BuildStage.Paused:       ApplyYScale(ComputePausedYScale()); break;
+            }
+        }
+
+        // Applies the stage's material + owner tint to whatever renderers are currently
+        // active — the cube fallback, or the active phase instance's renderers. Paused
+        // falls back to the constructing material if no paused material is assigned.
+        private void ApplyStageMaterialAndTint(BuildStage stage)
         {
             switch (stage)
             {
                 case BuildStage.Queued:
-                    SwapMaterial(queuedMaterial);
+                    SwapMaterial(queuedMaterial);   // green ghost — no owner tint
-                    ApplyYScale(queuedYScale);
                     break;
-
                 case BuildStage.Constructing:
                     SwapMaterial(constructingMaterial);
                     ApplyOwnerTint();
-                    ApplyYScale(ComputeConstructingYScale());
                     break;
-
                 case BuildStage.Paused:
-                    // Use paused material if assigned; fall back to constructing
-                    // material if not (still readable, just less distinct).
                     SwapMaterial(pausedMaterial != null ? pausedMaterial : constructingMaterial);
                     ApplyOwnerTint();
-                    // Freeze Y-scale at whatever the accumulated progress represents.
-                    // ComputeConstructingYScale uses accumulatedConstructionTime alone
-                    // when constructionStartServerTime is -1 (the pause sentinel).
-                    ApplyYScale(ComputePausedYScale());
                     break;
             }
         }
 
+        // ----- Construction phases ----------------------------------------
+
+        // Resolves the effective phase set (tower's own, else the project default) and
+        // instantiates one inactive child per phase. Sets usePhases=false (cube fallback)
+        // if neither set has any phases. Runs on every peer in OnNetworkSpawn.
+        private void ResolvePhaseSet()
+        {
+            var def = TowerPlacementManager.GetDefinition(towerTypeId.Value);
+            effectivePhaseSet =
+                (def != null && def.ConstructionPhases != null && def.ConstructionPhases.PhaseCount > 0)
+                    ? def.ConstructionPhases
+                    : defaultPhaseSet;
+
+            int n = effectivePhaseSet != null ? effectivePhaseSet.PhaseCount : 0;
+            if (n <= 0)
+            {
+                usePhases = false;
+                return;
+            }
+
+            usePhases     = true;
+            phaseInstances = new GameObject[n];
+            phaseRenderers = new MeshRenderer[n][];
+
+            // Hide the legacy fallback cube — the instantiated phase prefabs replace it.
+            if (scaleTarget != null) scaleTarget.gameObject.SetActive(false);
+
+            for (int i = 0; i < n; i++)
+            {
+                var prefab = effectivePhaseSet.GetPhase(i);
+                if (prefab == null) continue;
+
+                var go = Instantiate(prefab, transform);
+                go.transform.localPosition = Vector3.zero;
+                go.transform.localRotation = Quaternion.identity;
+                go.SetActive(false);
+
+                phaseInstances[i] = go;
+                phaseRenderers[i] = go.GetComponentsInChildren<MeshRenderer>(true);
+            }
+        }
+
+        // Activates only phase <paramref name="index"/> and points tintedRenderers at its
+        // renderers so the existing material/tint helpers drive the active phase.
+        private void ShowPhase(int index)
+        {
+            if (phaseInstances == null) return;
+            index = Mathf.Clamp(index, 0, phaseInstances.Length - 1);
+
+            for (int i = 0; i < phaseInstances.Length; i++)
+                if (phaseInstances[i] != null)
+                    phaseInstances[i].SetActive(i == index);
+
+            activePhaseIndex = index;
+            tintedRenderers = phaseRenderers[index];
+        }
+
+        // Maps current normalized progress to a phase index (0..PhaseCount-1).
+        private int PhaseIndexFromProgress()
+        {
+            int n = effectivePhaseSet != null ? effectivePhaseSet.PhaseCount : 1;
+            if (n <= 1) return 0;
+            float p = ComputeProgressNormalized();
+            return Mathf.Clamp(Mathf.FloorToInt(p * n), 0, n - 1);
+        }
+
         // Stage index 0..stageCount-1 based on elapsed server time PLUS any accumulated
         // time from previous Constructing runs (resume support).
         // Returned Y-scale is (stageIndex + 1) / stageCount, so stage 0 = 1/4,

Assets/_Project/Scripts/Gameplay/RaceDefinition.cs

@@ -68,8 +68,8 @@ namespace TD.Gameplay
                  "the prefab based on the player's RaceSelection.")]
         public GameObject BuilderPrefab;
 
-        [Tooltip("STUB (Phase 1.8): tower roster available to this race. TowerRegistry will " +
+        [Tooltip("STUB: tower roster available to this race/builder. The draft pool or " +
-                 "filter to this list when the active player belongs to this race.")]
+                 "starting deck will eventually filter to this list for this race.")]
         public TowerDefinition[] Towers;
     }
 }

Assets/_Project/Scripts/Gameplay/TowerInstance.cs

@@ -1,5 +1,4 @@
 // Assets/_Project/Scripts/Gameplay/TowerInstance.cs
-using Unity.Collections;
 using Unity.Netcode;
 using UnityEngine;
 using TD.Core;
@@ -32,11 +31,11 @@ namespace TD.Gameplay
     /// <see cref="SetOccupied"/> are idempotent writes, so double-stamping is safe.</para>
     ///
     /// <para><b>Definition reference replication.</b> TowerDefinition assets live in the
-    /// project on all clients. We replicate the asset by name via a
+    /// project on all clients. We replicate the tower's <c>TowerTypeId</c> (its index in
-    /// <see cref="NetworkVariable{T}"/> holding a <c>FixedString64Bytes</c>, then look
+    /// <see cref="TowerPlacementManager"/>'s catalog) via a <see cref="NetworkVariable{T}"/>,
-    /// up the asset locally. This avoids serializing the full ScriptableObject over the
+    /// then resolve the full asset locally with <see cref="TowerPlacementManager.GetDefinition"/>.
-    /// network. The lookup uses a <see cref="TowerRegistry"/> singleton that must be
+    /// This avoids serializing the ScriptableObject over the network and reuses the same
-    /// present in the scene. (Temporary: will be driven by RaceDefinition in Path E.)</para>
+    /// identifier placement and the deck already use — a single source of truth.</para>
     ///
     /// <para><b>Combat.</b> No combat logic here yet. Combat fields live stubbed on
     /// <see cref="TowerDefinition"/>; they will be consumed by a future
@@ -58,12 +57,13 @@ namespace TD.Gameplay
 
         // ----- Networked state ------------------------------------------------
 
-        // The name of the TowerDefinition asset for this tower. Replicated so all
+        // The TowerTypeId (index into TowerPlacementManager's catalog) for this tower.
-        // clients can look up the full definition locally without sending the whole
+        // Replicated so every client resolves the full definition locally via the catalog —
-        // ScriptableObject over the wire.
+        // the same identifier placement and the deck already use. 0 = unset/invalid (the
-        private readonly NetworkVariable<FixedString64Bytes> definitionName =
+        // reserved catalog index). Replaces the old replicate-by-name + TowerRegistry path.
-            new NetworkVariable<FixedString64Bytes>(
+        private readonly NetworkVariable<int> definitionTypeId =
-                default,
+            new NetworkVariable<int>(
+                0,
                 readPerm: NetworkVariableReadPermission.Everyone,
                 writePerm: NetworkVariableWritePermission.Server);
 
@@ -95,8 +95,8 @@ namespace TD.Gameplay
 
         // ----- Local resolved state -------------------------------------------
 
-        // Resolved on every client in OnNetworkSpawn from definitionName.
+        // Resolved on every client in OnNetworkSpawn from definitionTypeId via the catalog.
-        // Null if the lookup fails (missing TowerRegistry or unknown name).
+        // Null if the lookup fails (TypeId not in the catalog on this peer).
         private TowerDefinition resolvedDefinition;
 
         // ----- Pre-spawn initialization data ----------------------------------
@@ -192,7 +192,7 @@ namespace TD.Gameplay
             hasPendingInit = true;
 
             // Cache the resolved definition on the server immediately — clients
-            // will resolve via the registry lookup once definitionName arrives.
+            // resolve from the replicated TowerTypeId via the catalog once it arrives.
             resolvedDefinition = def;
         }
 
@@ -206,7 +206,17 @@ namespace TD.Gameplay
             // every client sees correct values on its very first OnNetworkSpawn.
             if (IsServer && hasPendingInit)
             {
-                definitionName.Value = new FixedString64Bytes(pendingDefinition.name);
+                // Resolve the catalog index for this definition and replicate that.
+                int typeId = 0;
+                var pm = TowerPlacementManager.Instance;
+                if (pm == null || !pm.TryGetTypeId(pendingDefinition, out typeId))
+                {
+                    Debug.LogError($"[TowerInstance] Could not resolve a TowerTypeId for " +
+                                   $"'{pendingDefinition?.name}'. Ensure it is in the " +
+                                   $"TowerPlacementManager catalog (towerDefinitions).");
+                }
+
+                definitionTypeId.Value = typeId;
                 anchorTile.Value = pendingAnchor;
                 ownerSlot.Value = pendingOwner;
 
@@ -331,27 +341,13 @@ namespace TD.Gameplay
             // Already resolved (server path via InitializeServer).
             if (resolvedDefinition != null) return;
 
-            string defName = definitionName.Value.ToString();
+            int typeId = definitionTypeId.Value;
-            if (string.IsNullOrEmpty(defName))
+            resolvedDefinition = TowerPlacementManager.GetDefinition(typeId);
-            {
-                Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
-                               $"definitionName is empty. Cannot resolve TowerDefinition.");
-                return;
-            }
-
-            var registry = TowerRegistry.Instance;
-            if (registry == null)
-            {
-                Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
-                               $"No TowerRegistry found in scene. Cannot resolve '{defName}'.");
-                return;
-            }
-
-            resolvedDefinition = registry.Get(defName);
             if (resolvedDefinition == null)
             {
                 Debug.LogError($"[TowerInstance] NetworkObject {NetworkObjectId}: " +
-                               $"TowerRegistry does not contain a definition named '{defName}'.");
+                               $"no TowerDefinition for TypeId {typeId}. Is the " +
+                               $"TowerPlacementManager catalog populated on this peer?");
             }
         }
 

Assets/_Project/Scripts/Gameplay/TowerRegistry.cs

@@ -1,120 +0,0 @@
-// Assets/_Project/Scripts/Gameplay/TowerRegistry.cs
-using System.Collections.Generic;
-using UnityEngine;
-using TD.Towers;
-
-namespace TD.Gameplay
-{
-    /// <summary>
-    /// Scene singleton that holds every <see cref="TowerDefinition"/> available in the
-    /// current match and lets any code look one up by asset name.
-    /// </summary>
-    /// <remarks>
-    /// <para><b>Why this exists.</b> <see cref="TowerInstance"/> replicates a tower's
-    /// definition by name (a <c>FixedString64Bytes</c> over the network), then resolves
-    /// the full ScriptableObject locally on every client. TowerRegistry is the lookup
-    /// table that makes that resolution possible without hard-coding asset paths.</para>
-    ///
-    /// <para><b>Registration.</b> Drag every <see cref="TowerDefinition"/> asset into the
-    /// <c>Definitions</c> list on this component in the inspector. Assets can live anywhere
-    /// in the project — no special folder required.</para>
-    ///
-    /// <para><b>Path E upgrade path.</b> In Path E the registry will filter to only the
-    /// definitions belonging to the active match's <c>RaceDefinition</c> rosters. For now
-    /// all assigned assets are registered.</para>
-    ///
-    /// <para><b>Plain MonoBehaviour.</b> Not a NetworkBehaviour — the registry is
-    /// identical on every peer (same assets, same names), so there is nothing to sync.</para>
-    /// </remarks>
-    public class TowerRegistry : MonoBehaviour
-    {
-        // ----- Singleton --------------------------------------------------
-
-        /// <summary>
-        /// The active TowerRegistry. Null before Awake or after the scene unloads.
-        /// Always null-check before use.
-        /// </summary>
-        public static TowerRegistry Instance { get; private set; }
-
-        // ----- Inspector --------------------------------------------------
-
-        [Tooltip("All TowerDefinition assets available in this match. " +
-                 "Drag assets here from Assets/_Project/Data/TowerDefinitions/ " +
-                 "(or wherever they live). Asset name is used as the registry key.")]
-        [SerializeField] private TowerDefinition[] definitions;
-
-        // ----- Internal lookup table --------------------------------------
-
-        // Keyed by TowerDefinition.name (the asset name, not DisplayName).
-        private readonly Dictionary<string, TowerDefinition> byName
-            = new Dictionary<string, TowerDefinition>();
-
-        // ----- Lifecycle --------------------------------------------------
-
-        private void Awake()
-        {
-            if (Instance != null && Instance != this)
-            {
-                Debug.LogError("[TowerRegistry] Multiple instances detected. " +
-                               "Only one TowerRegistry should exist per scene.");
-                return;
-            }
-            Instance = this;
-
-            BuildLookupTable();
-        }
-
-        private void OnDestroy()
-        {
-            if (Instance == this) Instance = null;
-        }
-
-        // ----- Public API -------------------------------------------------
-
-        /// <summary>
-        /// Returns the <see cref="TowerDefinition"/> whose asset name equals
-        /// <paramref name="assetName"/>, or null if no match is found.
-        /// </summary>
-        public TowerDefinition Get(string assetName)
-        {
-            byName.TryGetValue(assetName, out var def);
-            return def;
-        }
-
-        /// <summary>
-        /// Returns all registered tower definitions. Enumerates the internal
-        /// dictionary values — do not modify the returned collection.
-        /// </summary>
-        public IEnumerable<TowerDefinition> All => byName.Values;
-
-        // ----- Private ----------------------------------------------------
-
-        private void BuildLookupTable()
-        {
-            byName.Clear();
-
-            if (definitions == null || definitions.Length == 0)
-            {
-                Debug.LogWarning("[TowerRegistry] No TowerDefinition assets assigned. " +
-                                 "Drag assets into the Definitions list on the TowerRegistry component.");
-                return;
-            }
-
-            foreach (var def in definitions)
-            {
-                if (def == null) continue;
-
-                if (byName.ContainsKey(def.name))
-                {
-                    Debug.LogWarning($"[TowerRegistry] Duplicate asset name '{def.name}'. " +
-                                     $"Only the first entry will be used. Rename one of the assets.");
-                    continue;
-                }
-
-                byName[def.name] = def;
-            }
-
-            Debug.Log($"[TowerRegistry] Registered {byName.Count} tower definition(s).");
-        }
-    }
-}

Assets/_Project/Scripts/Gameplay/TowerRegistry.cs.meta

@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: a9dc0fbbe4422bc479ab8db7658c082b

Assets/_Project/Scripts/Towers/ConstructionPhaseSet.cs

@@ -0,0 +1,32 @@
+// Assets/_Project/Scripts/Towers/ConstructionPhaseSet.cs
+using UnityEngine;
+
+namespace TD.Towers
+{
+    /// <summary>
+    /// An ordered set of construction-stage visuals a build site transitions between as a
+    /// tower is built — typically 3 assets (early → mid → late). A tower references its own
+    /// set via <see cref="TowerDefinition.ConstructionPhases"/>; build sites fall back to a
+    /// project-default set when a tower doesn't define one.
+    /// </summary>
+    /// <remarks>
+    /// The entries are <b>shape</b> prefabs only. <c>BuildSiteVisual</c> applies the
+    /// queued (green) / constructing / paused materials and the owner tint on top, so the
+    /// phase assets don't need their own build-state materials. Keep them simple
+    /// (single material) — the build site swaps the active phase's renderer material.
+    /// </remarks>
+    [CreateAssetMenu(fileName = "ConstructionPhaseSet", menuName = "TD/Construction Phase Set")]
+    public class ConstructionPhaseSet : ScriptableObject
+    {
+        [Tooltip("Ordered construction-stage prefabs. Shown in sequence as the build " +
+                 "progresses — e.g. 3 entries = early / mid / late thirds of the build.")]
+        [SerializeField] private GameObject[] phases;
+
+        /// <summary>Number of construction phases in this set.</summary>
+        public int PhaseCount => phases != null ? phases.Length : 0;
+
+        /// <summary>The phase prefab at <paramref name="index"/>, or null if out of range.</summary>
+        public GameObject GetPhase(int index)
+            => (phases != null && index >= 0 && index < phases.Length) ? phases[index] : null;
+    }
+}

Assets/_Project/Scripts/Towers/ConstructionPhaseSet.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c8f2a4e1b9d6437052a1e8c4f7b3d069
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData:
+  assetBundleName:
+  assetBundleVariant:

Assets/_Project/Scripts/Towers/TowerDefinition.cs

@@ -68,6 +68,11 @@ namespace TD.Towers
                  "replace with a real mesh when art is available.")]
         public GameObject TowerPrefab;
 
+        [Tooltip("Optional per-tower construction-stage visuals shown while this tower is " +
+                 "being built. Leave empty to use the project-default set assigned on the " +
+                 "BuildSiteVisual prefab.")]
+        public ConstructionPhaseSet ConstructionPhases;
+
         [Tooltip("Icon shown on this tower's tile in the HUD build menu. Auto-generated from " +
                  "the TowerPrefab by the 'TD/Generate Tower Icons' menu item, or assign a " +
                  "Sprite manually. Null falls back to the grey placeholder icon.")]

Project_Context.md

@@ -90,7 +90,7 @@ Unity **6.4 (6000.4.4f1)**, URP, IL2CPP, .NET Standard 2.1, Linear color space,
 - **Visuals are placeholder** throughout (primitive/cone towers, sourced enemy models). See roadmap art TODOs.
 - **Enemies lack idle animation support** — needs adding across all enemy prefabs.
 - **Tower footprint visuals don't fill their 2×2 space** — the cone/mesh sits centered and reads smaller than the tile area it occupies; should visually reflect the full footprint.
-- **Two redundant tower lists:** `TowerPlacementManager.towerDefinitions[]` (by-index catalog) and `TowerRegistry.definitions[]` (by-name, for instance resolution). Candidate for consolidation.
+- **Tower catalog is now a single source of truth:** `TowerPlacementManager.towerDefinitions[]` (by-index, = `TowerTypeId`). `TowerInstance` replicates that index and resolves via `TowerPlacementManager.GetDefinition`. *(The old by-name `TowerRegistry` was removed 2026-06-24 — add new towers only to `towerDefinitions` + `DraftPool`.)*
 - **Catalog index 0 is a reserved sentinel** (valid `TowerTypeId`s start at 1) — easy to forget when wiring the catalog in the inspector.
 - **Catalog-index identifiers aren't session-stable** — blocks cross-match persistence until a stable ID is added.
 - **Paint system frozen**; **Race vs Builder** naming unresolved; the gold **"Buy Roll available any time"** rule is provisional and may change.