# Changes in camera.py to fix fixed frame option in 3D

Author: kolibril13

manim/camera/camera.py

@@ -414,9 +414,8 @@ def extract_mobject_family_members(self, mobjects, only_those_with_points=False)
         else:
             method = Mobject.get_family
         if self.use_z_index:
-            mobjects.sort(key=lambda m: m.z_index)
+            mobjects = sorted(mobjects,key=lambda m: m.z_index)
         return remove_list_redundancies(list(it.chain(*[method(m) for m in mobjects])))
-
     def get_mobjects_to_display(
         self, mobjects, include_submobjects=True, excluded_mobjects=None
     ):