From 982d437267253fd8ba40e407bb7f3ba1f5f8e998 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Thu, 4 Apr 2019 14:29:52 -0700
Subject: [PATCH] Use get_family_updaters to test if a mobject should be drawn
 during every frame of an animation

---
 manimlib/mobject/mobject.py | 6 ++++++
 manimlib/scene/scene.py     | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 6eeeec74..ca87344c 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -173,6 +173,12 @@ class Mobject(Container):
     def get_updaters(self):
         return self.updaters
 
+    def get_family_updaters(self):
+        return list(it.chain(*[
+            sm.get_updaters()
+            for sm in self.get_family()
+        ]))
+
     def add_updater(self, update_function, index=None, call_updater=True):
         if index is None:
             self.updaters.append(update_function)
diff --git a/manimlib/scene/scene.py b/manimlib/scene/scene.py
index 2a0ca6b4..7a8b69f6 100644
--- a/manimlib/scene/scene.py
+++ b/manimlib/scene/scene.py
@@ -288,7 +288,7 @@ class Scene(Container):
         for i, mob in enumerate(mobjects):
             update_possibilities = [
                 mob in animation_mobjects,
-                len(mob.get_updaters()) > 0,
+                len(mob.get_family_updaters()) > 0,
                 mob in self.foreground_mobjects
             ]
             if any(update_possibilities):