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Hallucinated or dropped edges in Transform of Graph
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
https://github.com/user-attachments/assets/f54ab219-5e51-4817-beb3-ec9b262329c0
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
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.
* graph1 before:
* Family:[Undirected graph on 3 vertices and 2 edges, Dot, Dot, Dot, Line, Line]
* sub: [Dot, Dot, Dot, Line, Line]
* graph2
* Family: [Undirected graph on 3 vertices and 4 edges, Dot, Dot, Dot, Line, Line, Line, Line]
* sub: [Dot, Dot, Dot, Line, Line]
* graph1 after Transform.
* Family: [Undirected graph on 3 vertices and 2 edges, Dot, Dot, Dot, Dot, Dot, Line, Line]
* sub: [Dot, Dot, Dot, Dot, Dot, Line, Line]
Observations:
- There is some problems with submobject and cloning those in Transform
- Self-closing graphs seems to produce two lines in in some point and that most likely is the culprit
- I quess Transform automatic submobject fitting does not like that and fail (end product has two Point models with line- points)
from manim import *
config.disable_caching = True
class BugDemo(Scene):
def construct(self):
def break_model(models:Mobject, where, color):
for i, model in enumerate(models):
self.play(model.animate.move_to(model.get_center()+where * (i+1)).set_color(color))
# 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"), ("C", "A")]).move_to(DL*2 +LEFT)
# Display the first graph
self.add(graph2)
self.play(Create(graph1))
# Attempt to transform graph1 into graph2
print("graph1 before:", graph1.get_family(),"sub:", graph1.submobjects)
t_family = graph2.get_family()
print("target",t_family ,"sub:", graph1.submobjects)
self.play(Transform(graph1, graph2))
g1_after = graph1.get_family()
print("after", g1_after,"sub:", graph1.submobjects)
graph2.clear_updaters()
graph1.clear_updaters()
self.play(graph1.animate.move_to(UL*2 +LEFT))
break_model(t_family[1:], RIGHT, YELLOW)
break_model(g1_after[1:], RIGHT, RED)
self.wait(1)
https://github.com/user-attachments/assets/d74c1327-0c0b-4aa7-b7e6-8ebe00667044
