升级XR插件版本

Packages/MCPForUnity/Editor/Tools/Vfx/TrailControl.cs

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+using Newtonsoft.Json.Linq;
+using UnityEditor;
+using UnityEngine;
+using MCPForUnity.Editor.Helpers;
+
+namespace MCPForUnity.Editor.Tools.Vfx
+{
+    internal static class TrailControl
+    {
+        public static object Clear(JObject @params)
+        {
+            TrailRenderer tr = TrailRead.FindTrailRenderer(@params);
+            if (tr == null) return new { success = false, message = "TrailRenderer not found" };
+
+            Undo.RecordObject(tr, "Clear Trail");
+            tr.Clear();
+            return new { success = true, message = "Trail cleared" };
+        }
+
+        public static object Emit(JObject @params)
+        {
+            TrailRenderer tr = TrailRead.FindTrailRenderer(@params);
+            if (tr == null) return new { success = false, message = "TrailRenderer not found" };
+
+            RendererHelpers.EnsureMaterial(tr);
+
+#if UNITY_2021_1_OR_NEWER
+            Vector3 pos = ManageVfxCommon.ParseVector3(@params["position"]);
+            tr.AddPosition(pos);
+            return new { success = true, message = $"Emitted at ({pos.x}, {pos.y}, {pos.z})" };
+#else
+            return new { success = false, message = "AddPosition requires Unity 2021.1+" };
+#endif
+        }
+    }
+}