Hallucinated or dropped edges in Transform of Graph

[niplav]

Description of bug / unexpected behavior

When Transforming a Graph into another graph with a different number of edges, the resulting animated graph has the same number of edges as the original graph.

For example, when transforming the graph Graph(["A", "B", "C"], [("A", "B"), ("A", "C")]) to Graph(["A", "B", "C"], [("A", "B"), ("A", "C"), ("B", "C")]), the resulting graph should be a triangle, but one edge is dropped.

Expected behavior

The graph that is the result of a transformation has the number of edges that is specified in the code, not the number of edges the predecessor had.

How to reproduce the issue

Code for reproducing the problem

from manim import *

class BugDemo(Scene):
    def construct(self):
        # Create a graph with two edges
        graph1 = Graph(["A", "B", "C"], [("A", "B"), ("A", "C")])

        # Create another graph with three edges
        graph2 = Graph(["A", "B", "C"], [("A", "B"), ("A", "C"), ("B", "C")])

        # Display the first graph
        self.play(Create(graph1))
        self.wait(1)

        # Attempt to transform graph1 into graph2
        self.play(Transform(graph1, graph2))
        self.wait(1)

Additional media files

Images/GIFs

BugDemo.mp4

Logs

Terminal output

Manim Community v0.18.1

[10/05/24 20:26:24] DEBUG    Hashing ...                                                                                        hashing.py:352
                    DEBUG    Hashing done in 0.006551 s.                                                                        hashing.py:364
                    DEBUG    Hash generated :  1185818338_2661024192_223132457                                                  hashing.py:367
                    DEBUG    List of the first few animation hashes of the scene: ['1185818338_2661024192_223132457']     cairo_renderer.py:97
                    INFO     Animation 0 : Partial movie file written in                                              scene_file_writer.py:527
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /1185818338_2661024192_223132457.mp4'                                                                            
                    DEBUG    Animation with empty mobject                                                                     animation.py:175
                    DEBUG    Hashing ...                                                                                        hashing.py:352
                    DEBUG    Hashing done in 0.005637 s.                                                                        hashing.py:364
                    DEBUG    Hash generated :  624642324_3890345977_2618601865                                                  hashing.py:367
                    DEBUG    List of the first few animation hashes of the scene: ['1185818338_2661024192_223132457',     cairo_renderer.py:97
                             '624642324_3890345977_2618601865']                                                                               
[10/05/24 20:26:25] INFO     Animation 1 : Partial movie file written in                                              scene_file_writer.py:527
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_3890345977_2618601865.mp4'                                                                            
                    DEBUG    Hashing ...                                                                                        hashing.py:352
                    DEBUG    Hashing done in 0.011324 s.                                                                        hashing.py:364
                    DEBUG    Hash generated :  624642324_2810248401_2118276392                                                  hashing.py:367
                    DEBUG    List of the first few animation hashes of the scene: ['1185818338_2661024192_223132457',     cairo_renderer.py:97
                             '624642324_3890345977_2618601865', '624642324_2810248401_2118276392']                                            
                    INFO     Animation 2 : Partial movie file written in                                              scene_file_writer.py:527
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_2810248401_2118276392.mp4'                                                                            
                    DEBUG    Animation with empty mobject                                                                     animation.py:175
                    DEBUG    Hashing ...                                                                                        hashing.py:352
                    DEBUG    Hashing done in 0.006592 s.                                                                        hashing.py:364
                    DEBUG    Hash generated :  624642324_3890345977_3537993160                                                  hashing.py:367
                    DEBUG    List of the first few animation hashes of the scene: ['1185818338_2661024192_223132457',     cairo_renderer.py:97
                             '624642324_3890345977_2618601865', '624642324_2810248401_2118276392',                                            
                             '624642324_3890345977_3537993160']                                                                               
                    INFO     Animation 3 : Partial movie file written in                                              scene_file_writer.py:527
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_3890345977_3537993160.mp4'                                                                            
                    INFO     Combining to Movie file.                                                                 scene_file_writer.py:617
                    DEBUG    Partial movie files to combine (4 files):                                                scene_file_writer.py:561
                             ['/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDem                         
                             o/1185818338_2661024192_223132457.mp4',                                                                          
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_3890345977_2618601865.mp4',                                                                           
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_2810248401_2118276392.mp4',                                                                           
                             '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/partial_movie_files/BugDemo                         
                             /624642324_3890345977_3537993160.mp4']                                                                           
                    INFO                                                                                              scene_file_writer.py:737
                             File ready at '/home/niplav/proj/site/anim/turning/media/videos/bug/480p15/BugDemo.mp4'                          
                                                                                                                                              
                    INFO     Rendered BugDemo                                                                                     scene.py:247
                             Played 4 animations                                                                                              

System specifications

System Details

• OS Void Linux:

› uname -a                                                                                                                                                                                                   (manim)
Linux REDACTED 6.6.52_1 #1 SMP PREEMPT_DYNAMIC Sat Sep 21 15:47:36 UTC 2024 x86_64 GNU/Linux
› cat /etc/os-release                                                                                                                                                                                        (manim)
NAME="Void"
ID="void"
PRETTY_NAME="Void Linux"
HOME_URL="https://voidlinux.org/"
DOCUMENTATION_URL="https://docs.voidlinux.org/"
LOGO="void-logo"
ANSI_COLOR="0;38;2;71;128;97"

DISTRIB_ID="void"

• RAM: 16GB
• Python version (python/py/python3 --version):

python3 --version                                                                                                                                                                                          (manim)
Python 3.12.5

• Installed modules (provide output from pip list):

Package              Version
-------------------- -----------
Brotli               1.1.0
build                1.2.1
CacheControl         0.14.0
certifi              2024.7.4
cffi                 1.17.0
charset-normalizer   3.3.2
cleo                 2.1.0
click                8.1.7
click-default-group  1.2.4
cloup                3.0.5
colorama             0.4.6
crashtest            0.4.1
cryptography         43.0.0
decorator            5.1.1
distlib              0.3.8
dulwich              0.21.7
fastjsonschema       2.20.0
filelock             3.15.4
future               1.0.0
glcontext            2.5.0
h2                   4.1.0
hpack                4.0.0
hyperframe           6.0.1
idna                 3.7
importlib_metadata   8.2.0
installer            0.7.0
isosurfaces          0.1.2
jaraco.classes       3.4.0
jeepney              0.8.0
keyring              24.3.1
manim                0.18.1
ManimPango           0.5.0
mapbox_earcut        1.0.1
markdown-it-py       3.0.0
mdurl                0.1.2
moderngl             5.10.0
moderngl-window      2.4.1
more-itertools       10.4.0
msgpack              1.0.8
multipledispatch     0.6.0
networkx             3.3
numpy                1.26.4
packaging            24.1
pexpect              4.9.0
pillow               10.4.0
pip                  24.2
pkginfo              1.11.1
platformdirs         4.2.2
poetry               1.8.3
poetry-core          1.9.0
poetry-plugin-export 1.8.0
ptyprocess           0.7.0
pycairo              1.26.1
pycparser            2.22
pydub                0.25.1
pyglet               1.5.27
Pygments             2.18.0
pyproject_hooks      1.1.0
pyrr                 0.10.3
PySocks              1.7.1
PyYAML               6.0.2
rapidfuzz            3.9.6
requests             2.32.3
requests-toolbelt    1.0.0
rich                 13.7.1
scipy                1.14.0
screeninfo           0.8.1
SecretStorage        3.3.3
setuptools           72.1.0
shellingham          1.5.4
six                  1.16.0
skia-pathops         0.8.0.post1
srt                  3.5.3
svgelements          1.9.6
tomli                2.0.1
tomlkit              0.13.0
tqdm                 4.66.5
trove-classifiers    2024.7.2
typing_extensions    4.12.2
urllib3              2.2.2
virtualenv           20.26.3
watchdog             4.0.1
wheel                0.44.0
zipp                 3.19.2
zstandard            0.23.0

Additional comments

[0x13b]

After self.play(Transform(graph1, graph2)) you see graph1 left on the screen with 4 dots dots and 2 lines as submobjects. It's rather strange to see. Just print graph1.submobjects out.

Using ReplacementTransform results in graph2 left on the screen with all vertices and edges as expected.