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Assets/Editor/MultiSplineFollowerEditor.cs

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+using UnityEngine;
+using UnityEditor;
+using UnityEngine.Splines;
+using System.Linq;
+
+[CustomEditor(typeof(MultiSplineFollower))]
+public class MultiSplineFollowerEditor : Editor
+{
+    public override void OnInspectorGUI()
+    {
+        // Vẽ inspector mặc định (hiện các trường routes, routes1, routes2, speed, rotationSpeed, ...)
+        base.OnInspectorGUI();
+
+        MultiSplineFollower follower = (MultiSplineFollower)target;
+
+        // Hiển thị từng nhóm route
+        DrawRouteGroup(follower.routes, "Routes (Nhóm 0)");
+        DrawRouteGroup(follower.routes1, "Routes1 (Nhóm 1)");
+        DrawRouteGroup(follower.routes2, "Routes2 (Nhóm 2)");
+
+        if (GUI.changed)
+        {
+            EditorUtility.SetDirty(follower);
+        }
+    }
+
+    private void DrawRouteGroup(SplineRoute[] routeArray, string groupLabel)
+    {
+        if (routeArray == null) return;
+
+        EditorGUILayout.Space();
+        EditorGUILayout.LabelField(groupLabel, EditorStyles.boldLabel);
+
+        for (int r = 0; r < routeArray.Length; r++)
+        {
+            var route = routeArray[r];
+            if (route == null) continue;
+
+            EditorGUILayout.BeginVertical("box");
+            EditorGUILayout.LabelField($"Route {r + 1}", EditorStyles.miniBoldLabel);
+
+            // START
+            if (route.splineStart != null)
+            {
+                int knotCount = route.splineStart.Spline?.Knots.Count() ?? 0;
+                if (knotCount > 0)
+                {
+                    string[] options = Enumerable.Range(0, knotCount).Select(i => $"Knot {i}").ToArray();
+                    route.startKnotIndex = EditorGUILayout.Popup("Start Knot", route.startKnotIndex, options);
+                }
+                else
+                {
+                    EditorGUILayout.HelpBox("SplineStart không có knot nào.", MessageType.Warning);
+                }
+            }
+            else
+            {
+                EditorGUILayout.HelpBox("Chưa gán splineStart", MessageType.Info);
+            }
+
+            // END
+            if (route.splineEnd != null)
+            {
+                int knotCount = route.splineEnd.Spline?.Knots.Count() ?? 0;
+                if (knotCount > 0)
+                {
+                    string[] options = Enumerable.Range(0, knotCount).Select(i => $"Knot {i}").ToArray();
+                    route.endKnotIndex = EditorGUILayout.Popup("End Knot", route.endKnotIndex, options);
+                }
+                else
+                {
+                    EditorGUILayout.HelpBox("SplineEnd không có knot nào.", MessageType.Warning);
+                }
+            }
+            else
+            {
+                EditorGUILayout.HelpBox("Chưa gán splineEnd", MessageType.Info);
+            }
+
+            EditorGUILayout.EndVertical();
+        }
+    }
+}

Assets/Editor/MultiSplineFollowerEditor.cs.meta

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+fileFormatVersion: 2
+guid: 1ffddca8b3c7373478b7fe510bc6dbf6