From 31d94c343ff4f773e8a883188f2440a6594b92f6 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 10 Aug 2025 23:20:57 +0300
Subject: [PATCH 1/7] Add support for negative z-index in AnimationGroup

---
 manim/scene/scene.py                          |  27 +++++++++++++++++-
 .../negative_z_index_AnimationGroup.npz       | Bin 0 -> 4070 bytes
 .../geometry/negative_z_index_LaggedStart.npz | Bin 0 -> 13083 bytes
 tests/test_graphical_units/test_geometry.py   |  14 +++++++++
 4 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz
 create mode 100644 tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index 9ea3e31749..f173e1f042 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -885,6 +885,31 @@ def clear(self) -> Self:
         self.foreground_mobjects = []
         return self
 
+    def recursively_unpack_animation_groups(self, *animations: Animation) -> list[Mobject]:
+        """
+        Unpacks animations
+        Parameters
+        ----------
+        *animations
+            The animations to unpack
+        Returns
+        ------
+        list
+            The list of mobjects in animations
+        """
+        # Imported inside the method to avoid cyclic import
+        from ..animation.composition import AnimationGroup
+
+        mobjects = []
+        for anim in animations:
+            if isinstance(anim, AnimationGroup):
+                for sub in anim.animations:
+                    unpacked = self.recursively_unpack_animation_groups(sub)
+                    mobjects.extend(unpacked)
+            else:
+                mobjects.append(anim.mobject)
+        return mobjects
+
     def get_moving_mobjects(self, *animations: Animation) -> list[Mobject]:
         """
         Gets all moving mobjects in the passed animation(s).
@@ -904,7 +929,7 @@ def get_moving_mobjects(self, *animations: Animation) -> list[Mobject]:
         # as soon as there's one that needs updating of
         # some kind per frame, return the list from that
         # point forward.
-        animation_mobjects = [anim.mobject for anim in animations]
+        animation_mobjects = self.recursively_unpack_animation_groups(*animations)
         mobjects = self.get_mobject_family_members()
         for i, mob in enumerate(mobjects):
             update_possibilities = [
diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz
new file mode 100644
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diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz
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HcmV?d00001

diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index fef2ca0951..4fac170e02 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -173,6 +173,20 @@ def test_ZIndex(scene):
     scene.play(ApplyMethod(circle.shift, UP))
     scene.play(ApplyMethod(triangle.shift, 2 * UP))
 
+@frames_comparison(last_frame=False)
+def test_negative_z_index_AnimationGroup(scene):
+    # https://github.com/ManimCommunity/manim/issues/3334
+    s = Square().set_z_index(-1)
+    scene.play(AnimationGroup(GrowFromCenter(s)))
+
+
+@frames_comparison(last_frame=False)
+def test_negative_z_index_LaggedStart(scene):
+    # https://github.com/ManimCommunity/manim/issues/3914
+    text = Text("Some text", font_size=30)
+    line = Line(2 * LEFT, 2 * RIGHT, color=RED_D, z_index=-1)
+    scene.play(LaggedStart(FadeIn(text), FadeIn(line), lag_ratio=0.5))
+
 
 @frames_comparison
 def test_Angle(scene):

From 78b2ec5abb30c6d421895ef8f2527fac367094ff Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sun, 10 Aug 2025 20:22:24 +0000
Subject: [PATCH 2/7] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 manim/scene/scene.py                        | 4 +++-
 tests/test_graphical_units/test_geometry.py | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index f173e1f042..d3ddf9586e 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -885,7 +885,9 @@ def clear(self) -> Self:
         self.foreground_mobjects = []
         return self
 
-    def recursively_unpack_animation_groups(self, *animations: Animation) -> list[Mobject]:
+    def recursively_unpack_animation_groups(
+        self, *animations: Animation
+    ) -> list[Mobject]:
         """
         Unpacks animations
         Parameters
diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index 4fac170e02..c74cbc457f 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -173,6 +173,7 @@ def test_ZIndex(scene):
     scene.play(ApplyMethod(circle.shift, UP))
     scene.play(ApplyMethod(triangle.shift, 2 * UP))
 
+
 @frames_comparison(last_frame=False)
 def test_negative_z_index_AnimationGroup(scene):
     # https://github.com/ManimCommunity/manim/issues/3334

From c66bf557da050b71db8db6135fdee97e486cb87e Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 10 Aug 2025 23:26:25 +0300
Subject: [PATCH 3/7] Refactor animation unpacking logic for clarity

---
 manim/scene/scene.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index d3ddf9586e..e5ea4234ab 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -902,15 +902,15 @@ def recursively_unpack_animation_groups(
         # Imported inside the method to avoid cyclic import
         from ..animation.composition import AnimationGroup
 
-        mobjects = []
+        unpacked_mobjects = []
         for anim in animations:
             if isinstance(anim, AnimationGroup):
                 for sub in anim.animations:
                     unpacked = self.recursively_unpack_animation_groups(sub)
-                    mobjects.extend(unpacked)
+                    unpacked_mobjects.extend(unpacked)
             else:
-                mobjects.append(anim.mobject)
-        return mobjects
+                unpacked_mobjects.append(anim.mobject)
+        return unpacked_mobjects
 
     def get_moving_mobjects(self, *animations: Animation) -> list[Mobject]:
         """

From c07c89ba154bb13855f1a9b1b6a46093e5cd0413 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 10 Aug 2025 23:28:11 +0300
Subject: [PATCH 4/7] Fix unpacking logic to handle Mobject instances correctly

---
 manim/scene/scene.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index e5ea4234ab..598e33c658 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -908,7 +908,7 @@ def recursively_unpack_animation_groups(
                 for sub in anim.animations:
                     unpacked = self.recursively_unpack_animation_groups(sub)
                     unpacked_mobjects.extend(unpacked)
-            else:
+            elif isinstance(anim, Mobject):
                 unpacked_mobjects.append(anim.mobject)
         return unpacked_mobjects
 

From 709f51cd029a89a235668148e6ac8c4f7af2bf21 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 10 Aug 2025 23:48:24 +0300
Subject: [PATCH 5/7] Fix mypy check

---
 manim/scene/scene.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index 598e33c658..7a2910c856 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -887,7 +887,7 @@ def clear(self) -> Self:
 
     def recursively_unpack_animation_groups(
         self, *animations: Animation
-    ) -> list[Mobject]:
+    ) -> list[Mobject | OpenGLMobject]:
         """
         Unpacks animations
         Parameters
@@ -908,7 +908,7 @@ def recursively_unpack_animation_groups(
                 for sub in anim.animations:
                     unpacked = self.recursively_unpack_animation_groups(sub)
                     unpacked_mobjects.extend(unpacked)
-            elif isinstance(anim, Mobject):
+            else:
                 unpacked_mobjects.append(anim.mobject)
         return unpacked_mobjects
 

From f97131f16bbce80b4269adec756ed9c6baf03e91 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Mon, 11 Aug 2025 00:03:15 +0300
Subject: [PATCH 6/7] Fix tests

---
 .../geometry/negative_z_index_LaggedStart.npz | Bin 13083 -> 4490 bytes
 ...animation_groups_with_negative_z_index.npz | Bin 0 -> 3153 bytes
 tests/test_graphical_units/test_geometry.py   |  10 +++++++---
 3 files changed, 7 insertions(+), 3 deletions(-)
 create mode 100644 tests/test_graphical_units/control_data/geometry/nested_animation_groups_with_negative_z_index.npz

diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz
index 7158d6fc84add4c9857532add46775efe4ec9572..dd5e8344d97466a8070f184a7d7057fb2e709367 100644
GIT binary patch
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diff --git a/tests/test_graphical_units/control_data/geometry/nested_animation_groups_with_negative_z_index.npz b/tests/test_graphical_units/control_data/geometry/nested_animation_groups_with_negative_z_index.npz
new file mode 100644
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z|5xAio+k4D=I5N5BJZ0wTgdeFJt{EK$y<Eb;t!YhygC6EONcv0$<Yv?RtQ|^@!LMT
z{94u9z$dx8iWydI45gOIqvlW?0#~lye)0Tu^zF5Q&qgDM;?ShB0av!}+&-UQO?)(R
zs2s4=Fz(7$W1I7je{M28wa2%d&%tyX7d1>BHG>)<(6Ec`ac145+U;&Lx4%5cxZ+qC
zBQ=a2HG>)<5ODq76C?ZBzgvb^<Q(|_g+0KVkx7>UwF3ZZ+Jl<;d`Mx}08Wmm-GKma
RRyL3lMj*5S(*MC-0su?lp?UxS

literal 0
HcmV?d00001

diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index c74cbc457f..1bc66ba897 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -184,10 +184,14 @@ def test_negative_z_index_AnimationGroup(scene):
 @frames_comparison(last_frame=False)
 def test_negative_z_index_LaggedStart(scene):
     # https://github.com/ManimCommunity/manim/issues/3914
-    text = Text("Some text", font_size=30)
-    line = Line(2 * LEFT, 2 * RIGHT, color=RED_D, z_index=-1)
-    scene.play(LaggedStart(FadeIn(text), FadeIn(line), lag_ratio=0.5))
+    line_1 = Line(LEFT, RIGHT, color=BLUE)
+    line_2 = Line(UP + LEFT, UP + RIGHT, color=RED).set_z_index(-1)
+    scene.play(LaggedStart(FadeIn(line_1), FadeIn(line_2), lag_ratio=0.5))
 
+@frames_comparison(last_frame=False)
+def test_nested_animation_groups_with_negative_z_index(scene):
+    line = Line(LEFT, RIGHT, color=BLUE).set_z_index(-1)
+    scene.play(AnimationGroup(AnimationGroup(AnimationGroup(FadeIn(line)))))
 
 @frames_comparison
 def test_Angle(scene):

From fa52f04cf890433dcd54a2993f39a685ccbecb06 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Sun, 10 Aug 2025 21:03:59 +0000
Subject: [PATCH 7/7] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 tests/test_graphical_units/test_geometry.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index 1bc66ba897..9f9b6eda59 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -188,11 +188,13 @@ def test_negative_z_index_LaggedStart(scene):
     line_2 = Line(UP + LEFT, UP + RIGHT, color=RED).set_z_index(-1)
     scene.play(LaggedStart(FadeIn(line_1), FadeIn(line_2), lag_ratio=0.5))
 
+
 @frames_comparison(last_frame=False)
 def test_nested_animation_groups_with_negative_z_index(scene):
     line = Line(LEFT, RIGHT, color=BLUE).set_z_index(-1)
     scene.play(AnimationGroup(AnimationGroup(AnimationGroup(FadeIn(line)))))
 
+
 @frames_comparison
 def test_Angle(scene):
     l1 = Line(ORIGIN, RIGHT)