diff --git a/server/gameserver/mapinstance.cc b/server/gameserver/mapinstance.cc
index d22ac756..b26264c1 100644
--- a/server/gameserver/mapinstance.cc
+++ b/server/gameserver/mapinstance.cc
@@ -882,9 +882,13 @@ bool MapInstance::SceneRaycast(const glm::vec3& orig,
                                float max_distance,
                                glm::vec3& hit_pos)
 {
+    if (max_distance <= 0.001f) {
+        return false;
+    }
     float nearest_distance = 0.0f;
     glm::vec3 nearest_pt(0.0f, 0.0f, 0.0f);
     int raycast_index = MapMgr::Instance()->IncCurrRaycastIndex();
+    float len = 0.0f;
     while (true) {
 
     }
diff --git a/server/gameserver/mapservice.cc b/server/gameserver/mapservice.cc
index dd37bdf8..6de7a860 100644
--- a/server/gameserver/mapservice.cc
+++ b/server/gameserver/mapservice.cc
@@ -145,3 +145,17 @@ int MapService::GetGridId(float world_x, float world_y)
     int grid_id = (int)(world_x/cell_width_) + (int)(world_y/cell_width_) * map_width_;
     return grid_id;
 }
+
+void MapService::GetGridList(int grid_id, list_head* grid_list[9], int& grid_count)
+{
+    grid_count = 0;
+    if (grid_id <= 0 || grid_id >= max_grid_id_) {
+        return;
+    }
+    for (int i = 0; i < 9; ++i) {
+        int idx = grid_id + grid_offset_arr_[i];
+        if (idx >= 0 && idx < max_grid_id_) {
+            grid_list[grid_count++] = &map_cells_[idx];
+        }
+    }
+}
diff --git a/server/gameserver/mapservice.h b/server/gameserver/mapservice.h
index c4585f9b..efbcd953 100644
--- a/server/gameserver/mapservice.h
+++ b/server/gameserver/mapservice.h
@@ -25,9 +25,8 @@ class MapService
 
     bool CanAdd(const glm::vec3& pos, int rad);
     void AddTriangle(mc::Triangle* tri);
-
- private:
     int GetGridId(float world_x, float world_y);
+    void GetGridList(int grid_id, list_head* grid_list[9], int& grid_count);
 
  private:
     list_head* map_cells_ = nullptr;