diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index f8aed6f..86e5f87 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -4291,12 +4291,74 @@ void Human::CheckSpecObject()
     std::set<ColliderComponent*> colliders;
     room->map_service->GetSpecColliders(spec_flags, room, GetPos().x, GetPos().y, colliders);
 
+    bool in_grass = false;
+    bool in_water = false;
+    bool in_ice = false;
     for (const ColliderComponent* collider : colliders) {
         switch (collider->owner->GetEntityType()) {
-        case ET_Loot:
+        case ET_Obstacle:
+        case ET_Building:
             break;
         default:
             break;
         }
     }
+
+    if (in_grass) {
+        if (!HasBuffEffect(kBET_InGrass)) {
+            OnEnterGrass();
+        }
+    } else {
+        if (HasBuffEffect(kBET_InGrass)) {
+            OnLeaveGrass();
+        }
+    }
+    if (in_water) {
+        if (!HasBuffEffect(kBET_InWater)) {
+            OnEnterWater();
+        }
+    } else {
+        if (HasBuffEffect(kBET_InWater)) {
+            OnLeaveWater();
+        }
+    }
+    if (in_ice) {
+        if (!HasBuffEffect(kBET_InIce)) {
+            OnEnterIce();
+        }
+    } else {
+        if (HasBuffEffect(kBET_InIce)) {
+            OnLeaveIce();
+        }
+    }
+}
+
+void Human::OnEnterGrass()
+{
+
+}
+
+void Human::OnLeaveGrass()
+{
+
+}
+
+void Human::OnEnterWater()
+{
+
+}
+
+void Human::OnLeaveWater()
+{
+
+}
+
+void Human::OnEnterIce()
+{
+
+}
+
+void Human::OnLeaveIce()
+{
+
 }
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index a693c86..e6452b3 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -356,6 +356,12 @@ private:
     void DoGetOnWithLoot(Loot* loot_entity);
     void DoGetOnWithCar(Car* car);
     void CheckSpecObject();
+    void OnEnterGrass();
+    void OnLeaveGrass();
+    void OnEnterWater();
+    void OnLeaveWater();
+    void OnEnterIce();
+    void OnLeaveIce();
 
 protected:
     int level_ = 0;