[BUG] manimgl and self.wait() breaks presentation

[KarolisRam]

Terms

• Checked the existing issues and discussions to see if my issue had not already been reported;
• Checked the frequently asked questions;
• Read the installation instructions;
• Created a virtual environment in which I can reproduce my bug;

Describe the issue

I use manimlib and wanted to convert a large video I've been working on to manim-slides. It had a lot of self.wait() commands which break the presentation.

A minimal example:

from manim_slides import Slide
from manimlib import *


class BasicExample(Slide):
    def construct(self):

        for i in range(3):
            text = Text(str(i), font_size=360)
            self.play(Write(text))
            self.wait(2.0)
            self.remove(text)
            self.next_slide()

manim-slides render --GL test.py BasicExample
manim-slides BasicExample

The above will produce slides that terminate on text with number "1", not "2":

I know there is this warning:

manim-slides/manim_slides/config.py

Lines 267 to 268 in ccbe9d5

	"IMPORTANT: when using ManimGL, 'self.wait()' is not considered "
	"to be an animation, so prefer to directly use 'self.play(...)'."

So, I fixed it by overriding the self.wait() with a dummy self.play():

from manim_slides import Slide
from manimlib import *


class CustomSlide(Slide):
    def wait(self, duration=1.0, **kwargs):
        self.play(Write(Text("")), run_time=duration, **kwargs)


class BasicExample(CustomSlide):
    def construct(self):

        for i in range(3):
            text = Text(str(i), font_size=360)
            self.play(Write(text))
            self.wait(2.0)
            self.remove(text)
            self.next_slide()

Is there a better way to solve it?

Command

manim-slides render --GL test.py BasicExample; manim-slides BasicExample

Python version

3.12.3

Python environment

Manim Slides version: 5.4.2
Python executable: /home/karolis/k/manim/venv-manim/bin/python
Manim bindings:
        manim not found
        manimgl (version: 1.7.2)
Qt API: pyside6 (version: 6.8.1)

What is your platform?

Linux

[jeertmans]

Hi @KarolisRam, thanks for reaching out! I am not aware of any better workaround than playing an invisible animations. In presentation, slides with only a call to « wait » are quite rare, imo, and it is relatively fast to render. You chose an empty text, but there might be even faster ways like an invisible line, or a dot.