ManimCommunity / ManimCommunity/manim
PointCloudDot doesn't animate color or alpha
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issue:bug
- Dominant language
- Python
- Stars
- 40.9k
- Forks
- 3.1k
- Avg merge
- 3d 12h
- Merged PRs (30d)
- 25
Description
Description of bug / unexpected behavior
The PointCloudDot object doesn't animate the color or alpha of its points. Whether using fade_to, animate.fade_to or FadeIn/FadeOut, the points will just animate some weird double-blinking.
Expected behavior
As all other MObjects, the PointCloudDot should properly animate fade, i.e. alpha, at least for all child points at the same time.
How to reproduce the issue
pf = PointCloudDot(
color=RED, stroke_width=7, density=20)
self.add(pf)
self.play(pf.animate.fade_to(color=RED, alpha=0))
Code for reproducing the problem
class MWE(Scene):
def construct(self):
pf = self.make_pressure_field().shift(UP*.5)
self.add(pf)
# I'd like to replace this line with a set_color_and_alpha or something, as it shouldn't be animated.
self.play(pf.animate.fade_to(color=BLUE, alpha=0))
self.play(pf.animate.fade_to(color=BLUE, alpha=1))
self.wait()
def make_pressure_field(self):
cloud = PointCloudDot(
color=BLUE, stroke_width=7, density=20)
cloud.apply_complex_function(
lambda z: complex(random(-6, 6), random(-3, 3)))
return cloud
Additional media files
Images/GIFs
Logs
Terminal output
[11/30/21 18:49:03] DEBUG Hashing ... hashing.py:344
DEBUG Hashing done in 0.009390 s. hashing.py:356
DEBUG Hash generated : 450974505_3712993816_2214048929 hashing.py:359
DEBUG List of the first few animation hashes of the scene: ['450974505_3712993816_2214048929'] cairo_renderer.py:83
[11/30/21 18:49:05] INFO Animation 0 : Partial movie file written in 'FOLDER scene_file_writer.py:510
\media\videos\main\1080p60\partial_movie_files\MWE\450974505_3712993816_2214048929.mp4'
DEBUG Hashing ... hashing.py:344
DEBUG Hashing done in 0.004477 s. hashing.py:356
DEBUG Hash generated : 34786186_3712993816_2214048929 hashing.py:359
DEBUG List of the first few animation hashes of the scene: ['450974505_3712993816_2214048929', cairo_renderer.py:83
'34786186_3712993816_2214048929']
[11/30/21 18:49:07] INFO Animation 1 : Partial movie file written in 'FOLDER scene_file_writer.py:510
\media\videos\main\1080p60\partial_movie_files\MWE\34786186_3712993816_2214048929.mp4'
DEBUG Animation with empty mobject animation.py:165
DEBUG Hashing ... hashing.py:344
DEBUG Hashing done in 0.003417 s. hashing.py:356
DEBUG Hash generated : 34786186_3493041802_2135821444 hashing.py:359
DEBUG List of the first few animation hashes of the scene: ['450974505_3712993816_2214048929', cairo_renderer.py:83
'34786186_3712993816_2214048929', '34786186_3493041802_2135821444']
INFO Animation 2 : Partial movie file written in 'FOLDER scene_file_writer.py:510
\media\videos\main\1080p60\partial_movie_files\MWE\34786186_3493041802_2135821444.mp4'
INFO Combining to Movie file. scene_file_writer.py:604
DEBUG Partial movie files to combine (3 files): ['FOLDER scene_file_writer.py:547
\\media\\videos\\digital-audio\\1080p60\\partial_movie_files\\MWE\\450974505_3712993816_2214048929.mp4',
'FOLDER\\media\\videos\\main\\1080p60\\partial_movie_files\\MWE\\34786186_3712993816_2214048929.mp4',
'FOLDER\\media\\videos\\main\\1080p60\\partial_movie_files\\MWE\\34786186_3493041802_2135821444.mp4']
INFO scene_file_writer.py:718
File ready at 'FOLDER\media\videos\main\1080p60\MWE.mp4'
INFO Rendered MWE scene.py:234
Played 3 animations
[11/30/21 18:49:08] INFO Previewed File at: 'FOLDER\media\videos\main\1080p60\MWE.mp4' file_ops.py:202
System specifications
System Details
- OS: Windows 10 21H1
- RAM: 32GB
- Python version (
python/py/python3 --version): 3.8.3 - Installed modules (provide output from
pip list):
Package Version
--------------------------------- ---------
2to3 1.0
absl-py 0.11.0
alabaster 0.7.12
argon2-cffi 20.1.0
astor 0.8.1
astunparse 1.6.3
async-generator 1.10
attrs 20.3.0
autopep8 1.5.3
Babel 2.8.0
backcall 0.2.0
backports.entry-points-selectable 1.1.0
beautifulsoup4 4.9.1
bleach 3.3.0
bs4 0.0.1
cachetools 4.2.0
certifi 2020.6.20
cffi 1.14.5
cfgv 3.3.1
chardet 3.0.4
click 8.0.1
click-default-group 1.2.2
cloudpickle 2.0.0
cloup 0.7.1
colorama 0.4.3
colour 0.1.5
commonmark 0.9.1
css-parser 1.0.4
cycler 0.10.0
decorator 5.0.7
defusedxml 0.7.1
deprecation 2.1.0
distlib 0.3.3
docutils 0.16
doit 0.33.1
entrypoints 0.3
eyeD3 0.9.5
filelock 3.3.2
filetype 1.0.7
flatbuffers 1.12
gast 0.3.3
glcontext 2.3.4
google-api-core 1.31.0
google-api-python-client 2.12.0
google-auth 1.32.1
google-auth-httplib2 0.1.0
google-auth-oauthlib 0.4.4
google-pasta 0.2.0
googleapis-common-protos 1.53.0
grpcio 1.32.0
h5py 2.10.0
httplib2 0.19.1
identify 2.3.3
idna 2.10
imagesize 1.2.0
ipykernel 5.5.3
ipython 7.22.0
ipython-genutils 0.2.0
ipywidgets 7.6.3
isosurfaces 0.1.0
jedi 0.18.0
Jinja2 2.11.2
jsonschema 3.2.0
jupyter 1.0.0
jupyter-client 6.1.12
jupyter-console 6.4.0
jupyter-core 4.7.1
jupyterlab-pygments 0.1.2
jupyterlab-widgets 1.0.0
Keras-Applications 1.0.8
Keras-Preprocessing 1.1.2
kiwisolver 1.3.1
lxml 4.5.2
manim 0.12.0
ManimPango 0.3.0
mapbox-earcut 0.12.10
Markdown 3.3.3
MarkupSafe 1.1.1
matplotlib 3.4.2
mistune 0.8.4
moderngl 5.6.4
moderngl-window 2.4.0
multipledispatch 0.6.0
nbclient 0.5.3
nbconvert 6.0.7
nbformat 5.1.3
nest-asyncio 1.5.1
networkx 2.6.2
nhentai.py 1.0.5
nodeenv 1.6.0
notebook 6.3.0
numpy 1.20.1
oauthlib 3.1.0
opbasm 1.3
opencv-python 4.5.1.48
opt-einsum 3.3.0
packaging 20.4
pandocfilters 1.4.3
parso 0.8.2
pickleshare 0.7.5
Pillow 8.1.0
pip 21.3.1
platformdirs 2.4.0
pre-commit 2.15.0
prometheus-client 0.10.1
prompt-toolkit 3.0.18
protobuf 3.14.0
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycairo 1.20.1
pycodestyle 2.6.0
pycparser 2.20
pydub 0.25.1
pyee 8.1.0
pyglet 1.5.18
Pygments 2.7.1
pyparsing 2.4.7
pyrr 0.10.3
pyrsistent 0.17.3
PySide2 5.15.2
python-dateutil 2.8.1
python-ffmpeg 1.0.11
pytz 2020.1
pywin32 300
pywinpty 0.5.7
PyYAML 6.0
pyzmq 22.0.3
qtconsole 5.0.3
QtPy 1.9.0
requests 2.24.0
requests-oauthlib 1.3.0
rich 10.6.0
rsa 4.6
rstcheck 3.3.1
scipy 1.7.1
screeninfo 0.6.7
Send2Trash 1.5.0
setuptools 41.2.0
shiboken2 5.15.2
six 1.15.0
skia-pathops 0.7.1
snowballstemmer 2.0.0
soupsieve 2.0.1
Sphinx 3.2.1
sphinx-rtd-theme 0.5.0
sphinxcontrib-applehelp 1.0.2
sphinxcontrib-devhelp 1.0.2
sphinxcontrib-htmlhelp 1.0.3
sphinxcontrib-jsmath 1.0.1
sphinxcontrib-qthelp 1.0.3
sphinxcontrib-serializinghtml 1.1.4
stackprinter 0.2.4
tensorboard 2.4.0
tensorboard-plugin-wit 1.7.0
tensorflow-estimator 2.4.0
tensorflow-gpu 2.4.0
termcolor 1.1.0
terminado 0.9.4
testpath 0.4.4
toml 0.10.1
tornado 6.1
tqdm 4.61.2
traitlets 5.0.5
typing-extensions 3.7.4.3
uritemplate 3.0.1
urllib3 1.25.9
virtualenv 20.10.0
watchdog 2.1.3
wcwidth 0.2.5
webencodings 0.5.1
Werkzeug 1.0.1
wheel 0.36.2
Whoosh 2.7.4
widgetsnbextension 3.5.1
wrapt 1.12.1
youtube-dl 2021.6.6
Output of ffmpeg -version:
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.1 (GCC) 20200726
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
libpostproc 55. 7.100 / 55. 7.100
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the provided MWE and inspect PointCloudDot together with fade_to, animate.fade_to, FadeIn, and FadeOut. Trace how color and alpha are propagated to the child points, then verify that fading the cloud changes all points consistently without double-blinking.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 43/100