Create script tool to help find edges of walkable area in the map for spawning enemies

Assets/Scripts/Editor/MapTools.meta

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+guid: 8bfa7c8a0203bf1478337d1187818f25
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
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Assets/Scripts/Editor/MapTools/EdgeDetectorTool.cs

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+using UnityEngine;
+using UnityEditor;
+using UnityEngine.AI;
+
+public class SpawnEdgeMarkerTool2D : EditorWindow {
+  public Transform IslandCenter;
+  public GameObject MarkerPrefab;
+
+  public float SearchRadius = 10f;
+  public int RayCount = 16;
+  public float StepSize = 0.25f;
+  public float RayDepth = 2f;
+  public bool ShowSceneGizmos = true;
+
+  [MenuItem("Tools/2D Spawn Edge Marker Tool")]
+  public static void ShowWindow() => GetWindow<SpawnEdgeMarkerTool2D>("2D Spawn Edge Tool");
+  private void OnEnable() => SceneView.duringSceneGui += OnSceneGUI;
+  private void OnDisable() => SceneView.duringSceneGui -= OnSceneGUI;
+
+  private void OnGUI() {
+    IslandCenter = (Transform)EditorGUILayout.ObjectField("Island Center", IslandCenter, typeof(Transform), true);
+    MarkerPrefab = (GameObject)EditorGUILayout.ObjectField("Spawn Marker Prefab", MarkerPrefab, typeof(GameObject), false);
+
+    EditorGUILayout.Space();
+
+    SearchRadius = EditorGUILayout.FloatField("Start Radius", SearchRadius);
+    RayCount = EditorGUILayout.IntField("Ray Count", RayCount);
+    StepSize = EditorGUILayout.FloatField("Step Size", StepSize);
+    RayDepth = EditorGUILayout.FloatField("NavMesh Sample Depth", RayDepth);
+
+    ShowSceneGizmos = EditorGUILayout.Toggle("Visualize in Scene", ShowSceneGizmos);
+
+    EditorGUILayout.Space();
+
+    if (GUILayout.Button("Place Spawn Markers")) {
+      if (IslandCenter == null) {
+        Debug.LogError("Island Center must be assigned!");
+        return;
+      }
+
+      PlaceSpawnMarkers2D();
+    }
+  }
+
+  private void OnSceneGUI(SceneView sceneView) {
+    if (!ShowSceneGizmos || IslandCenter == null) return;
+
+    Vector3 center = IslandCenter.position;
+    Handles.color = Color.cyan;
+
+    for (int i = 0; i < RayCount; i++) {
+      float angle = (360f / RayCount) * i;
+
+      Vector3 direction = new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad), 0f);
+      Vector3 start = center + direction * SearchRadius;
+
+      Handles.SphereHandleCap(0, start, Quaternion.identity, 0.2f, EventType.Repaint);
+      Handles.DrawLine(start, start - direction * 1.5f, 2);
+    }
+
+    SceneView.RepaintAll();
+  }
+
+  private void PlaceSpawnMarkers2D() {
+    Vector3 center = IslandCenter.position;
+    GameObject parent = new GameObject("EdgeSpawnMarkers2D");
+    Undo.RegisterCreatedObjectUndo(parent, "Create Spawn Markers");
+
+    for (int i = 0; i < RayCount; i++) {
+      float angle = (360f / RayCount) * i;
+      Vector3 direction = new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad), 0f);
+      Vector3 start = center + direction * SearchRadius;
+
+      for (float d = 0; d < SearchRadius; d += StepSize) {
+        Vector3 probe = start - direction * d;
+
+        // You can change this check based on your environment:
+        if (NavMesh.SamplePosition(probe, out NavMeshHit hit, RayDepth, NavMesh.AllAreas)) {
+          GameObject spawnPoint = MarkerPrefab != null
+              ? (GameObject)PrefabUtility.InstantiatePrefab(MarkerPrefab)
+              : new GameObject($"SpawnPoint_{i}");
+
+          spawnPoint.transform.position = hit.position;
+          spawnPoint.transform.SetParent(parent.transform);
+          Undo.RegisterCreatedObjectUndo(spawnPoint, "Place SpawnPoint");
+          break;
+        }
+
+        // Optional: For purely 2D check using layer
+        // if (Physics2D.OverlapPoint(probe)) { ... }
+      }
+    }
+
+    Debug.Log($"? Placed {RayCount} 2D spawn markers.");
+  }
+}

Assets/Scripts/Editor/MapTools/EdgeDetectorTool.cs.meta

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