# AlainConnor / manim

Animation engine for explanatory math videos

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Manim is an animation engine for explanatory math videos. It's used to create precise animations programmatically, as seen in the videos at 3Blue1Brown.

## Installation

Manim runs on python 3.7. You can install it from PyPI via pip

pip3 install manimlib

System requirements are cairo, ffmpeg, sox, latex (optional, if you want to use LaTeX).

You can now use it via the manim command. For example:

manim my_project.py MyScene

For more options, take a look at the “Using manim“ sections further below.

### Directly

If you want to hack on manimlib itself, clone this repository and in that directory execute:

# Install python requirements
python3 -m pip install -r requirements.txt

# Try it out
python3 -m manim example_scenes.py SquareToCircle -pl

### Directly (Windows)

1. Install Cairo. Download the wheel from https://www.lfd.uci.edu/~gohlke/pythonlibs/#pycairo. For most users, pycairo‑1.18.0‑cp37‑cp37m‑win32.whl will do fine.

pip3 install C:\path\to\wheel\pycairo‑1.18.0‑cp37‑cp37m‑win32.whl
2. Install a LaTeX distribution. MiKTeX is recommended.

3. Install the remaining Python packages. Make sure that pycairo==1.17.1 is changed to pycairo==1.18.0 in requirements.txt.

git clone https://github.com/3b1b/manim.git
cd manim
pip3 install -r requirements.txt
python3 manim.py example_scenes.py SquareToCircle -pl

## Anaconda Install

• Install sox and latex as above.
• Create a conda environment using conda env create -f environment.yml
• WINDOWS ONLY Install pyreadline via pip install pyreadline.

### Using virtualenv and virtualenvwrapper

After installing virtualenv and virtualenvwrapper

git clone https://github.com/3b1b/manim.git
mkvirtualenv -a manim -r requirements.txt manim
python3 -m manim example_scenes.py SquareToCircle -pl

### Using Docker

Since it's a bit tricky to get all the dependencies set up just right, there is a Dockerfile and Compose file provided in this repo as well as a premade image on Docker Hub. The Dockerfile contains instructions on how to build a manim image, while the Compose file contains instructions on how to run the image.

The image does not contain a copy of the repo. This is intentional, as it allows you to either bind mount a repo that you've cloned locally or clone any fork/branch you want. In order to do this with the Compose file, you must set the MANIM_PATH environment variable to the absolute path to the manim repo.

1. Install Docker
2. Install Docker Compose
3. Render an animation
MANIM_PATH=/absolute/path/to/manim/repo docker-compose run manim example_scenes.py SquareToCircle -l

The first time you execute the above command, Docker will pull the image from Docker Hub and cache it. Any subsequent runs until the image is evicted will use the cached image. Note that the image doesn't have any development tools installed and can't preview animations. Its purpose is building and testing only.

## Using manim

Try running the following:

python3 -m manim example_scenes.py SquareToCircle -pl

The -p is for previewing, meaning the video file will automatically open when it is done rendering. Use -l for a faster rendering at a lower quality. Use -s to skip to the end and just show the final frame. Use -n (number) to skip ahead to the n'th animation of a scene. Use -f to show the file in finder (for osx)

Set MEDIA_DIR environment variable to determine where image and animation files will be written.

Look through the old_projects folder to see the code for previous 3b1b videos. Note, however, that developments are often made to the library without considering backwards compatibility on those old_projects. To run them with a guarantee that they will work, you will have to go back to the commit which complete that project.

While developing a scene, the -sp flags are helpful to just see what things look like at the end without having to generate the full animation. It can also be helpful to use the -n flag to skip over some number of animations.

### Documentation

Documentation is in progress at manim.readthedocs.io.

### Walkthrough

Todd Zimmerman put together a tutorial on getting started with manim, which has been updated to run on python 3.7.

### Live Streaming

To live stream your animations, simply run manim with the --livestream option.

> python -m manim --livestream
Writing to media/videos/scene/scene/1080p30/LiveStreamTemp.mp4

Manim is now running in streaming mode. Stream animations by passing
them to manim.play(), e.g.
>>> c = Circle()
>>> manim.play(ShowCreation(c))

>>>

It is also possible to stream directly to Twitch. To do that simply pass --livestream and --to-twitch to manim and specify the stream key with --with-key. Then when you follow the above example the stream will directly start on your Twitch channel (with no audio support).

## Contributing

Is always welcome. In particular, there is a dire need for tests and documentation.

All files in the directories active_projects and old_projects, which by and large generate the visuals for 3b1b videos, are copyright 3Blue1Brown.

The general purpose animation code found in the remainder of the repository, on the other hand, is under the MIT license.