diff --git a/bbp_ng/UTIL_naming_convension.py b/bbp_ng/UTIL_naming_convension.py
index 49a924d..ccd3ffc 100644
--- a/bbp_ng/UTIL_naming_convension.py
+++ b/bbp_ng/UTIL_naming_convension.py
@@ -360,6 +360,8 @@ def set_to_object(obj: bpy.types.Object, info: BallanceObjectInfo, reporter: Ren
                     gp.add_group('Phys_Floors')
                     gp.add_group('Sound_HitID_01')
                     gp.add_group('Sound_RollID_01')
+                    # floor type also need group into shadow group.
+                    gp.add_group('Shadow')
                 case BallanceObjectType.RAIL:
                     gp.add_group('Phys_FloorRails')
                     gp.add_group('Sound_HitID_02')