void scriptapi_environment_step(lua_State *L, float dtime);
/* luaentity */
-void scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
+// Returns true if succesfully added into Lua; false otherwise.
+bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
const char *init_state);
void scriptapi_luaentity_rm(lua_State *L, u16 id);
std::string scriptapi_luaentity_get_state(lua_State *L, u16 id);