diff --git a/manimlib/scene/scene.py b/manimlib/scene/scene.py
index ed4bd5fc..79745ca6 100644
--- a/manimlib/scene/scene.py
+++ b/manimlib/scene/scene.py
@@ -1021,9 +1021,10 @@ class EndScene(Exception):
 class ThreeDScene(Scene):
     samples = 4
     default_frame_orientation = (-30, 70)
+    always_depth_test = True
 
     def add(self, *mobjects, set_depth_test: bool = True):
         for mob in mobjects:
-            if set_depth_test and not mob.is_fixed_in_frame():
+            if set_depth_test and not mob.is_fixed_in_frame() and self.always_depth_test:
                 mob.apply_depth_test()
         super().add(*mobjects)