Strokes are not rendered in some installations of Manim using OpenGL renderer

[Darylgolden]

Description of bug / unexpected behavior

from manim import *
from manim.opengl import *

class Test(Scene):
    def construct(self):
        circle = OpenGLCircle()
        circle.set_fill(BLUE, opacity=0.5)
        circle.set_stroke(BLUE_E, width=4)
        square = OpenGLSquare(fill_opacity=0, stroke_opacity=1, stroke_color=RED, stroke_width=5, draw_stroke_behind_fill=False)

        self.play(FadeIn(square))
        self.wait()

Gives a blank black screen:

Test.mp4

While

from manim import *
from manim.opengl import *

class Test(Scene):
    def construct(self):
        circle = OpenGLCircle()
        circle.set_fill(BLUE, opacity=0.5)
        circle.set_stroke(BLUE_E, width=4)
        square = OpenGLSquare(fill_opacity=1, stroke_opacity=1, stroke_color=RED, stroke_width=5, draw_stroke_behind_fill=False)

        self.play(FadeIn(square))
        self.wait()

Gives this:

Test.mp4

This shows that the problem in my local installation lies with rendering strokes.

Expected behavior

Strokes should render correctly.

How to reproduce the issue

Code for reproducing the problem

Paste your code here.

Additional media files

Images/GIFs

Logs

Terminal output

PASTE HERE OR PROVIDE LINK TO https://pastebin.com/ OR SIMILAR

System specifications

System Details

• OS Microsoft Windows 10 Home Insider Preview Version10.0.21343 Build 21343
• RAM: Is this relevant?
• Python version (python/py/python3 --version): Python 3.9.2
• Installed modules (provide output from pip list):

Package                       Version
----------------------------- -----------
alabaster                     0.7.12
ansicon                       1.89.0
anyio                         2.2.0
appdirs                       1.4.4
argon2-cffi                   20.1.0
astroid                       2.5.2
async-generator               1.10
attrs                         20.3.0
Babel                         2.9.0
backcall                      0.2.0
bleach                        3.3.0
blessed                       1.18.0
certifi                       2020.12.5
cffi                          1.14.5
chardet                       4.0.0
colorama                      0.4.4
colour                        0.1.5
commonmark                    0.9.1
decorator                     4.4.2
defusedxml                    0.7.0
dnspython                     1.16.0
docopt                        0.6.2
docutils                      0.16
entrypoints                   0.3
fett                          0.3.2
flyingcircus                  0.1.3.2
glcontext                     2.3.3
grpcio                        1.33.2
grpcio-tools                  1.33.2
idna                          2.10
imagesize                     1.2.0
ipykernel                     5.5.0
ipython                       7.21.0
ipython-genutils              0.2.0
isort                         5.8.0
jedi                          0.18.0
Jinja2                        2.11.3
jinxed                        1.0.1
json5                         0.9.5
jsonschema                    3.2.0
jupyter-client                6.1.11
jupyter-core                  4.7.1
jupyter-packaging             0.7.12
jupyter-server                1.4.1
jupyterlab                    3.0.9
jupyterlab-pygments           0.1.2
jupyterlab-server             2.3.0
lazy-object-proxy             1.6.0
livereload                    2.6.3
manim                         0.5.0
ManimPango                    0.2.4
mapbox-earcut                 0.12.10
MarkupSafe                    1.1.1
mccabe                        0.6.1
mistune                       0.8.4
moderngl                      5.6.4
moderngl-window               2.3.0
multipledispatch              0.6.0
nbclassic                     0.2.6
nbclient                      0.5.3
nbconvert                     6.0.7
nbformat                      5.1.2
nest-asyncio                  1.5.1
networkx                      2.5
notebook                      6.2.0
numpy                         1.20.1
packaging                     20.9
pandocfilters                 1.4.3
parso                         0.8.1
pickleshare                   0.7.5
Pillow                        8.1.0
pip                           21.0.1
prometheus-client             0.9.0
prompt-toolkit                3.0.16
protobuf                      3.15.5
pycairo                       1.20.0
pycparser                     2.20
pydub                         0.24.1
pyglet                        1.5.15
Pygments                      2.8.0
pylint                        2.7.3
pymongo                       3.11.3
pyparsing                     2.4.7
pyrr                          0.10.3
pyrsistent                    0.17.3
python-dateutil               2.8.1
python-jsonrpc-server         0.3.4
pytk                          0.0.2.1
pytz                          2021.1
pywin32                       300
pywinpty                      0.5.7
PyYAML                        5.4.1
pyzmq                         22.0.3
requests                      2.25.1
rich                          6.2.0
rstcheck                      3.3.1
scipy                         1.6.1
Send2Trash                    1.5.0
setuptools                    53.1.0
setuptools-scm                5.0.2
six                           1.15.0
sniffio                       1.2.0
snooty-lextudio               1.8.10.dev0
snowballstemmer               2.1.0
Sphinx                        3.5.3
sphinx-autobuild              2021.3.14
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
terminado                     0.9.2
testpath                      0.4.4
toml                          0.10.2
tornado                       6.1
tqdm                          4.58.0
traitlets                     5.0.5
typing-extensions             3.7.4.3
urllib3                       1.26.3
watchdog                      1.0.2
wcwidth                       0.2.5
webencodings                  0.5.1
wheel                         0.36.2
wrapt                         1.12.1

LaTeX details

• LaTeX distribution (e.g. TeX Live 2020):
• Installed LaTeX packages:

FFMPEG

Output of ffmpeg -version:

Additional comments

[markromanmiller]

Has OpenGL rendering ever worked reasonably on your machine? In other words, is this a regression or something else?

[Darylgolden]

It's the first time I'm ever trying OpenGL rendering, so I have no idea.

[markromanmiller]

@ManimCommunity/windows crew, is anyone able to replicate? With master and Ubuntu, I'm not.

[Darylgolden]

For good measure, I've updated to master, and it still isn't working for me.

[Darylgolden]

Here are my tests on OpenGL Extensions Viewer 6, if that means anything.

[naveen521kk]

No idea why this happens to you, I can't reproduce this.

Test.mp4

I also tried the mesa setup, like done in our CI and still can't reproduce this. See https://moderngl.readthedocs.io/en/latest/install/installation.html#using-with-mesa-3d-on-windows on how to.

[Darylgolden]

I figured out the issue! Moderngl was running on Intel integrated graphics, which somehow didn't work. After making it use my NVIDIA graphics card, it worked properly.

From the OpenGL report for my graphics card.
I think the problem with the Intel rendering lies somewhere in "ARB 2015".

[einarf]

It would be useful if the opengl renderer showed the context and enviroment info on startup?

python -m moderngl outputs

moderngl 5.7.0
--------------
vendor: NVIDIA Corporation
renderer: GeForce RTX 2080 SUPER/PCIe/SSE2
version: 3.3.0 NVIDIA 456.71
python: 3.9.0 (tags/v3.9.0:9cf6752, Oct  5 2020, 15:34:40) [MSC v.1927 64 bit (AMD64)]
platform: win32
code: 330

https://github.com/moderngl/moderngl/blob/e6ca0dc2bc55914724594c5060313b54873ed17b/moderngl/__main__.py#L19-L46

[Darylgolden]

For integrated graphics (which doesn't work properly):

moderngl 5.6.4
--------------
vendor: Intel
renderer: Intel(R) UHD Graphics
version: 3.3.0 - Build 27.20.100.9168
python: 3.9.2 (tags/v3.9.2:1a79785, Feb 19 2021, 13:44:55) [MSC v.1928 64 bit (AMD64)]
platform: win32
code: 330

[einarf]

I don't really now how graphics switching works on Windows. I think this is based on power usage settings?

I know there is a hack in the manim rendered related to copying a multisampled framebuffer. I suspect it's related to this? I'm guessing a gl error is raised during the buffer copy?

.. or does this only apply when stokes are applied? I have to play more with manim because I don't know what I am looking at 😄

Intel UHD Graphics should be more that capable if the drivers are updated.

[Darylgolden]

Most mid-end and up laptops have a dedicated graphics card but use integrated graphics for most things to save power, but the user can switch the default graphics renderer and the renderer for specific programs. Therefore it's not a problem for me anymore, but it would be a problem for someone who only has integrated graphics.

[fabriciosb]

the issue! Moderngl was running on Intel integrated graphics, which somehow didn't work. After making it use my NVIDIA graphics card, it worked properly.

I am having the same problem (no strokes, only fill) when running ManimCE with "--use_opengl_renderer".
My python -m moderngl also return my intel, though I have a (super simple) Nvidea.
May I ask how did you select the graphics card?