A few animation primitives

luprex/core/cpp/world.hpp

@@ -43,6 +43,7 @@ public:
     std::unique_ptr<IdPlayerPool> id_player_pool_;
 
     void be_a_player();
+    void update_plane_item();
 };
 
 class World {
@@ -110,6 +111,13 @@ public:
     // Get a pointer to the specified tangible.
     //
     Tangible *tangible_get(int64_t id);
+
+    // Get a pointer to the specified tangible.
+    //
+    // The value on the lua stack should be a valid lua tangible.  If not,
+    // a lua error is generated.
+    //
+    Tangible *tangible_get(lua_State *L, int idx);
     
     // Delete a tangible with the specified ID.
     //