diff --git a/.gitignore b/.gitignore
index 2bd91eb..6ac5d77 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,4 @@ src/Unity/obj/
 src/Unity/Logs/
 src/Unity/UserSettings/
 unity_plugins/
+nul
diff --git a/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs b/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
index 6a2adbe..3f204cc 100644
--- a/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
+++ b/src/Unity/Assets/Scripts/Managers/SimulationRunner.cs
@@ -92,7 +92,10 @@ namespace CounterDrone.Unity
                 if (snap.EntityType == EntityType.Cloud)
                 {
                     float r = ParseCloudRadius(snap.StateData);
+                    float opacity = ParseCloudOpacity(snap.StateData);
                     go.transform.localScale = UVector3.one * r;
+                    var mat = go.GetComponent<Renderer>().material;
+                    mat.color = new Color(1, 0, 0, opacity);
                 }
             }
 
@@ -104,8 +107,8 @@ namespace CounterDrone.Unity
                     var prefab = _cloudPrefab != null ? _cloudPrefab : GameObject.CreatePrimitive(PrimitiveType.Sphere);
                     var go = Instantiate(prefab, pos, Quaternion.identity);
                     go.name = cloud.Id;
-                    go.transform.localScale = UVector3.one * 30f;
-                    // 半透明红色
+                    float r = cloud.Dispersion.Radius;
+                    go.transform.localScale = UVector3.one * r;
                     var mat = go.GetComponent<Renderer>().material;
                     mat.color = new Color(1, 0, 0, 0.3f);
                     _clouds[cloud.Id] = go;
@@ -155,7 +158,17 @@ namespace CounterDrone.Unity
             _entityVisuals[drone.Id] = go;
         }
 
-        private float ParseCloudRadius(string stateData)
+        private float ParseCloudOpacity(string stateData)
+        {
+            try
+            {
+                using var doc = JsonDocument.Parse(stateData);
+                if (doc.RootElement.TryGetProperty("opacity", out var o))
+                    return o.GetSingle();
+            }
+            catch { }
+            return 0.5f;
+        }
         {
             try
             {