原来是全局碰撞惹的祸

assets/resources/game/monster/monster.prefab

@@ -811,7 +811,7 @@
     "tag": 0,
     "_group": 2,
     "_density": 1,
-    "_sensor": true,
+    "_sensor": false,
     "_friction": 0.2,
     "_restitution": 0,
     "_offset": {
@@ -846,9 +846,9 @@
     "bullet": true,
     "awakeOnLoad": true,
     "_group": 2,
-    "_type": 1,
+    "_type": 2,
     "_allowSleep": false,
-    "_gravityScale": 0,
+    "_gravityScale": 1,
     "_linearDamping": 0,
     "_angularDamping": 0,
     "_linearVelocity": {

assets/resources/game/monster/niu.prefab

@@ -117,8 +117,8 @@
     },
     "_lscale": {
       "__type__": "cc.Vec3",
-      "x": -1,
-      "y": 1,
+      "x": -1.5,
+      "y": 1.5,
       "z": 1
     },
     "_mobility": 0,
@@ -651,6 +651,7 @@
     "__prefab": {
       "__id__": 31
     },
+    "_ospeed": 100,
     "_id": ""
   },
   {
@@ -669,10 +670,10 @@
     "__prefab": {
       "__id__": 33
     },
-    "tag": 0,
+    "tag": 90,
     "_group": 2,
     "_density": 1,
-    "_sensor": true,
+    "_sensor": false,
     "_friction": 0.2,
     "_restitution": 0,
     "_offset": {
@@ -707,9 +708,9 @@
     "bullet": true,
     "awakeOnLoad": true,
     "_group": 2,
-    "_type": 1,
+    "_type": 2,
     "_allowSleep": false,
-    "_gravityScale": 0,
+    "_gravityScale": 1,
     "_linearDamping": 0,
     "_angularDamping": 0,
     "_linearVelocity": {