https://github.com/networked-aframe/networked-aframe

A web framework for building multi-user virtual reality experiences.
https://github.com/networked-aframe/networked-aframe

aframe game game-development multi-user-vr socialvr virtual-reality webrtc webvr webxr

Last synced: 30 days ago
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A web framework for building multi-user virtual reality experiences.

• Host: GitHub
• URL: https://github.com/networked-aframe/networked-aframe
• Owner: networked-aframe
• License: mit
• Created: 2017-01-18T09:25:59.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2024-07-23T02:32:34.000Z (4 months ago)
• Last Synced: 2024-10-02T04:32:53.046Z (about 1 month ago)
• Topics: aframe, game, game-development, multi-user-vr, socialvr, virtual-reality, webrtc, webvr, webxr
• Language: JavaScript
• Homepage: https://naf-examples.glitch.me
• Size: 36.3 MB
• Stars: 1,156
• Watchers: 65
• Forks: 296
• Open Issues: 51
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

Awesome Lists containing this project

• vr-resources - A-Frame Networked

README

        
[slack]: https://aframevr.slack.com/join/shared_invite/zt-f6rne3ly-ekVaBU~Xu~fsZHXr56jacQ



Networked-Aframe

=======





**Multi-user VR on the Web**

A framework for writing multi-user VR apps in HTML and JS.

Built on top of [A-Frame](https://aframe.io/).



  Features

  —

  Getting Started

  —

  Examples

  —

  Documentation

  —

  Contact






Features

--------

* Support for WebRTC and/or WebSocket connections.

* Voice chat. Audio streaming to let your users talk in-app (WebRTC only).

* Video chat. See video streams in-app.

* Bandwidth sensitive. Only send network updates when things change.

* Cross-platform. Works on all modern Desktop and Mobile browsers. Oculus Rift, Oculus Quest, HTC Vive and Google Cardboard.

* Extendable. Sync any A-Frame component, including your own, without changing the component code at all.

Release notes

-------------

You can read [the release notes](https://github.com/networked-aframe/networked-aframe/blob/master/docs/RELEASE_NOTES.md) to know what changed in the latest releases.

Getting Started

---------------

[![Remix on Glitch](https://cdn.glitch.com/2703baf2-b643-4da7-ab91-7ee2a2d00b5b%2Fremix-button.svg)](https://glitch.com/edit/#!/remix/naf-project)

Follow [the NAF Getting Started tutorial](https://github.com/networked-aframe/networked-aframe/blob/master/docs/getting-started-local.md) to build your own example from scratch, including setting up a local server.

To run the examples on your own PC:

```sh

git clone https://github.com/networked-aframe/networked-aframe.git  # Clone the repository.

cd networked-aframe

npm install  # Install dependencies.

npm run dev  # Start the local development server.

```

With the server running, browse the examples at `http://localhost:8080`. Open another browser tab and point it to the same URL to see the other client.

For info on how to host your experience on the internet, see the [NAF Hosting Guide](https://github.com/networked-aframe/networked-aframe/blob/master/docs/hosting-networked-aframe-on-a-server.md).

Basic Example

-------------

```html

  

    My Networked-Aframe Scene

    

    

    

    

  

  

    

      

        

          

        

      

      

      

    

  

```

More Examples

-------------

Open in two tabs if nobody else is online, or [remix the code examples yourself](https://glitch.com/edit/#!/remix/naf-examples).

* [Basic](https://naf-examples.glitch.me/basic.html)

* [Basic with 4 clients](https://naf-examples.glitch.me/basic-4.html)

* [Positional Audio](https://naf-examples.glitch.me/basic-audio.html)

* [Video Streaming](https://naf-examples.glitch.me/basic-video.html)

* [Nametags](https://naf-examples.glitch.me/nametag.html)

* [Tracked Controllers](https://naf-examples.glitch.me/tracked-controllers.html)

* [More...](https://naf-examples.glitch.me)

More complete examples:

* [Nametags with UI in SolidJS/Tailwind CSS](https://naf-nametag-solidjs.glitch.me/) ([GitHub](https://github.com/networked-aframe/naf-nametag-solidjs))

* [Realistic animated avatars with UI to choose your avatar](https://naf-valid-avatars.glitch.me/) ([GitHub](https://github.com/networked-aframe/naf-valid-avatars))

**Not updated to latest version:**

* [Dynamic Room Name](https://glitch.com/edit/#!/naf-dynamic-room)

* [Form to set room and username](https://glitch.com/edit/#!/naf-form-example)

Made something awesome with Networked-Aframe? [Let us know](https://github.com/networked-aframe/networked-aframe/issues) and we'll include it here.

Documentation

-------------

### Overview

Networked-Aframe works by syncing entities and their components to connected users. To connect to a room you need to add the [`networked-scene`](#scene-component) component to the `a-scene` element. For an entity to be synced, add the `networked` component to it. By default the `position` and `rotation` components are synced, but if you want to sync other components or child components you need to define a [schema](#syncing-custom-components). For more advanced control over the network messages see the sections on [Broadcasting Custom Messages](#sending-custom-messages) and [Options](#options).

### Scene component

Required on the A-Frame `` component.

```html

  ...

```

| Property | Description | Default Value |

| -------- | ----------- | ------------- |

| serverURL  | Choose where the WebSocket / signalling server is located. | / |

| app  | Unique app name. Spaces are not allowed. | default |

| room  | Unique room name. Can be multiple per app. Spaces are not allowed. There can be multiple rooms per app and clients can only connect to clients in the same app & room. | default |

| connectOnLoad  | Connect to the server as soon as the webpage loads. | true |

| onConnect  | Function to be called when client has successfully connected to the server. | onConnect |

| adapter | The network service that you wish to use, see [adapters](#adapters). | wseasyrtc |

| audio  | Turn on / off microphone audio streaming for your app. Only works if the chosen adapter supports it. | false |

| video  | Turn on / off video streaming for your app. Only works if the chosen adapter supports it. | false |

| debug  | Turn on / off Networked-Aframe debug logs. | false |

### Connecting

By default, `networked-scene` will connect to your server automatically. To prevent this and instead have control over when to connect, set `connectOnLoad` to false in `networked-scene`. When you are ready to connect emit the `connect` event on the `a-scene` element.

```javascript

AFRAME.scenes[0].emit('connect');

```

### Disconnecting

To disconnect simply remove the `networked-scene` component from the `a-scene` element.

```javascript

AFRAME.scenes[0].removeAttribute('networked-scene');

```

Completely removing `a-scene` from your page will also handle cleanly disconnecting.

### Creating Networked Entities

```html

  

    

      

    

  

```

Create an instance of a template to be synced across clients. The position and rotation will be synced by default. The [`buffered-interpolation`](https://github.com/InfiniteLee/buffered-interpolation) library is used to allow for less network updates while keeping smooth motion.

Templates must only have one root element. When `attachTemplateToLocal` is set to true, the attributes on this element will be copied to the local entity and the children will be appended to the local entity. Remotely instantiated entities will be a copy of the root element of the template with the `networked` component added to it.

#### Example `attachTemplateToLocal=true`

```html

  

  

```

#### Example `attachTemplateToLocal=false`

```html

  

```

| Property              | Description                                                                                                                              | Default Value |

| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | ------------- |

| template              | A css selector to a template tag stored in ``                                                                                  | ''            |

| attachTemplateToLocal | Does not attach the template for the local user when set to false. This is useful when there is different behavior locally and remotely. | true          |

| persistent            | On remote creator (not owner) disconnect, attempts to take ownership of persistent entities rather than delete them                      | false         |

### Deleting Networked Entities

Currently only the creator of a network entity can delete it. To delete, simply delete the element from the HTML using regular DOM APIs and Networked-Aframe will handle the syncing automatically.

### Syncing Custom Components

By default, the `position` and `rotation` components on the root entity are synced.

To sync other components and components of child entities you need to define a schema per template. Here's how to define and add a schema:

```javascript

NAF.schemas.add({

  template: '#avatar-template',

  components: [

    'position',

    'rotation',

    'scale',

    {

      selector: '.hairs',

      component: 'show-child'

    },

    {

      selector: '.head',

      component: 'material',

      property: 'color'

    },

  ]

});

```

Components of the root entity can be defined with the name of the component. Components of child entities can be defined with an object with both the `selector` field, which uses a standard CSS selector to be used by `document.querySelector`, and the `component` field which specifies the name of the component. To only sync one property of a multi-property component, add the `property` field with the name of the property.

Once you've defined the schema then add it to the list of schemas by calling `NAF.schemas.add(YOUR_SCHEMA)`.

Component data is retrieved by the A-Frame Component `data` property. During the network tick each component's data is checked against its previous synced value; if the data object has changed at all it will be synced across the network.

### Syncing components optimization

For each component, you can define a `requiresNetworkUpdate` function that

takes the current value and return true if the current value changed from the

previous value. You can return false if current and previous value are close

enough, to not send this change to other participants.

By default when you don't define it, it always use the `defaultRequiresUpdate` function (defined at the top of [`networked.js`](https://github.com/networked-aframe/networked-aframe/blob/master/src/components/networked.js)) which is using a generic `deepEqual` function to compare the current value with the previous value and use `cachedData = AFRAME.utils.clone(newData);` when both values are different to keep the previous value for the next comparison.

`AFRAME.utils.clone` implementation is doing `JSON.parse(JSON.stringify(obj))` that can be used with any type, but this may not be the best performance implementation for Vector3 type like position, rotation, scale.

Just so you know what this is doing:

```

> const v = new THREE.Vector3(1,2,3);

Vector3 {x: 1, y: 2, z: 3}

> JSON.parse(JSON.stringify(v))

{x: 1, y: 2, z: 3}

```

So this is creating a new object in memory each time the syncing process is done if the value changed, those objects are garbage collected at one point. Garbage collection in general can take 1ms or more if you have a heavy scene, a consequence could be that the browser drops some frames, so not having a consistent fps.

You can use Chrome profiler to confirm this. This is barely noticeable with just your moving avatar, but it may be important for your use case if the user owns a lot of continuously moving objects.

Moreover with the current aframe `wasd-controls` implementation and how the position is smoothed, the player position is still changing below the millimeter precision 2s after the user stopped pressing a key, so sending a lot of NAF messages over the network for visually unnoticeable changes of position.

NAF already includes position interpolation to smooth the position changes received, so sending all those position changes over the network is even redundant.

You can use a dedicated function to compare two Vector3 with a given precision to achieve better performance in term of sending less messages over the network and memory by avoiding creating new objects:

```

const vectorRequiresUpdate = epsilon => {

  return () => {

    let prev = null;

    return curr => {

      if (prev === null) {

        prev = new THREE.Vector3(curr.x, curr.y, curr.z);

        return true;

      } else if (!NAF.utils.almostEqualVec3(prev, curr, epsilon)) {

        prev.copy(curr);

        return true;

      }

      return false;

    };

  };

};

```

This function is actually defined in `NAF.utils.vectorRequiresUpdate` for you

to use.

To use it in your networked schema for a position precision of 1 millimeter

and rotation precision of 0.5 degree, use it like this:

```

{

  template: '#avatar-template',

  components: [

    {

      component: 'position',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.001)

    },

    {

      component: 'rotation',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.5)

    }

  ]

}

```

The default schema that sync position and rotation uses the above optimization since version 0.11.0.

### Syncing nested templates - eg. hands

To sync nested templates setup your HTML nodes like so:

```html

  

  

  

```

In this example the head/camera, left and right hands of controllers will spawn their own templates which will be networked independently of the root player. Note: this is not related to hand tracking which is currently not supported. This parent-child relationship only works between one level, ie. a child entity's direct parent must have the `networked` component.

You need to define your left and right hand templates yourself to show hand models for the other users. Only the position and rotation will be synced to the other users. To sync the hand gesture, see the `networked-hand-controls` component below.

### Tracked Controllers w/ Synced Gestures

This is a much simpler alternative to the above.

NAF allows easily adding hand models visible to the others that show emulated gestures (not hand tracking) matching to which buttons are touched--so you can point and give a thumbs up or make a fist to other people in the room.

All you have to do is use the built in `networked-hand-controls` component, by adding these two entities as children of your camera rig:

```html

  

  

```

```javascript

NAF.schemas.add({

  template: '#left-hand-default-template',

  components: [

    {

      component: 'position',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.001)

    },

    {

      component: 'rotation',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.5)

    },

    'networked-hand-controls'

  ]

});

NAF.schemas.add({

  template: '#right-hand-default-template',

  components: [

    {

      component: 'position',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.001)

    },

    {

      component: 'rotation',

      requiresNetworkUpdate: NAF.utils.vectorRequiresUpdate(0.5)

    },

    'networked-hand-controls'

  ]

});

```

### Sending Custom Messages

```javascript

NAF.connection.subscribeToDataChannel(dataType, callback)

NAF.connection.unsubscribeToDataChannel(dataType)

NAF.connection.broadcastData(dataType, data)

NAF.connection.broadcastDataGuaranteed(dataType, data)

NAF.connection.sendData(clientId, dataType, data)

NAF.connection.sendDataGuaranteed(clientId, dataType, data)

```

Subscribe and unsubscribe callbacks to network messages specified by `dataType`. Broadcast data to all clients in your room with the `broadcastData` functions. To send only to a specific client, use the `sendData` functions instead.

| Parameter | Description

| -------- | -----------

| clientId | ClientId to send this data to

| dataType  | String to identify a network message. `u` (Update), `um` (UpdateMulti) and `r` (Remove) are reserved data types, don't use them please

| callback  | Function to be called when message of type `dataType` is received. Parameters: `function(senderId, dataType, data, targetObj)` With the easyrtc adapter `targetObj` can be `{targetRoom: 'roomId'}` when broadcasting a message or `{targetEasyrtcid: 'targetId'}` when sending a message to a specific participant. With the janus adapter, senderId is always null and `targetObj` is more a `source` parameter and generally equals to "janus-event".

| data | Object to be sent to all other clients

### Transfer Entity Ownership

The owner of an entity is responsible for syncing its component data. When a user wants to modify another user's entity they must first take ownership of that entity. The [ownership transfer example](./examples/ownership-transfer.html) and the [toggle-ownership component](./examples/js/toggle-ownership.component.js) show how to take ownership of an entity and update it.

```javascript

NAF.utils.takeOwnership(entityEl)

```

Take ownership of an entity.

```javascript

NAF.utils.isMine(entityEl)

```

Check if you own the specified entity.

### Events

Events are fired when certain things happen in NAF. To subscribe to these events follow this pattern:

```javascript

document.body.addEventListener('clientConnected', function (evt) {

  console.error('clientConnected event. clientId =', evt.detail.clientId);

});

```

Events need to be subscribed after the `document.body` element has been created. This could be achieved by waiting for the `document.body` `onLoad` method, or by using NAF's `onConnect` function. Use the [NAF Events Demo](https://github.com/networked-aframe/networked-aframe/blob/master/examples/basic-events.html) as an example.

List of events:

| Event | Description | Values |

| -------- | ----------- | ------------- |

| clientConnected | Fired when another client connects to you | `evt.detail.clientId` - ClientId of connecting client |

| clientDisconnected | Fired when another client disconnects from you | `evt.detail.clientId` - ClientId of disconnecting client |

| entityCreated | Fired when a networked entity is created | `evt.detail.el` - new entity |

| entityRemoved | Fired when a networked entity is deleted | `evt.detail.networkId` - networkId of deleted entity |

The following events are fired on the `networked` component. See the [toggle-ownership component](./examples/js/toggle-ownership.component.js) for examples.

List of ownership transfer events:

| Event | Description | Values |

| -------- | ----------- | ------------- |

| ownership-gained | Fired when a networked entity's ownership is taken | `evt.detail.el` - the entity whose ownership was gained |

| | | `evt.detail.oldOwner` - the clientId of the previous owner |

| ownership-lost | Fired when a networked entity's ownership is lost | `evt.detail.el` - the entity whose ownership was lost |

| | | `evt.detail.newOwner` - the clientId of the new owner |

| ownership-changed | Fired when a networked entity's ownership is changed | `evt.detail.el` - the entity whose ownership was lost |

| | | `evt.detail.oldOwner` - the clientId of the previous owner |

| | | `evt.detail.newOwner` - the clientId of the new owner |

### Adapters

NAF can be used with multiple network libraries and services. An adapter is a class which adds support for a library to NAF. If you're just hacking on a small project or proof of concept you'll probably be fine with the default configuration and you can skip this section. Considerations you should make when evaluating different adapters are:

- How many concurrent users do you need to support in one room?

- Do you want to host your own server? Or would a "serverless" solution like Firebase do the job?

- Do you need audio (microphone) streaming?

- Do you need custom server-side logic?

- Do you want a WebSocket (client-server) network architecture or WebRTC (peer-to-peer)?

By default the `wseasyrtc` adapter is used, which does not support audio and uses a TCP connection. This is not ideal for production deployments however due to inherent connection issues with WebRTC we've set it as the default. To support audio via WebRTC be sure the server is using https and change the adapter to `easyrtc` (this uses UDP).

If you're interested in contributing to NAF a great opportunity is to add support for more adapters and send a pull request.

List of the supported adapters:

| Adapter | Description | Supports Audio/Video | WebSockets or WebRTC | How to start |

| -------- | ----------- | ------------- | ----------- | ---------- |

| wseasyrtc | DEFAULT - Uses the [open-easyrtc](https://github.com/open-easyrtc/open-easyrtc) library | No | WebSockets | `npm run dev` |

| easyrtc | Uses the [open-easyrtc](https://github.com/open-easyrtc/open-easyrtc) library | Audio and Video (camera and screen share) | WebRTC | `npm run dev` |

| janus | Uses the [Janus WebRTC server](https://github.com/meetecho/janus-gateway) and [janus-plugin-sfu](https://github.com/networked-aframe/janus-plugin-sfu) | Audio and Video (camera OR screen share) | WebRTC | See [naf-janus-adapter](https://github.com/networked-aframe/naf-janus-adapter/tree/3.0.x) |

| socketio | SocketIO implementation without external library (server supports [room instancing](https://github.com/networked-aframe/networked-aframe/pull/458)) | No | WebSockets | `npm run dev-socketio` |

| webrtc | Native WebRTC implementation without external library (work in progress, currently no maintainer) | Audio | WebRTC | `npm run dev-socketio` |

| Firebase | [Firebase](https://firebase.google.com/) for WebRTC signalling (currently no maintainer) | No | WebRTC | See [naf-firebase-adapter](https://github.com/networked-aframe/naf-firebase-adapter) |

| uWS | Implementation of [uWebSockets](https://github.com/uNetworking/uWebSockets) (currently no maintainer) | No | WebSockets | See [naf-uws-adapter](https://github.com/networked-aframe/naf-uws-adapter) |

WebRTC in the table means that component updates is using WebRTC Datachannels

(UDP) instead of the WebSocket (TCP). You still have a WebSocket for the signaling

part.

See also the document [NAF adapters comparison](https://github.com/networked-aframe/networked-aframe/wiki/NAF-adapters-comparison).

### Audio

After adding `audio: true` to the `networked-scene` component (and using an adapter that supports it) you will not hear any audio by default. Though the audio will be streaming, it will not be audible until an entity with a `networked-audio-source` is created. The audio from the owner of this entity will be emitted in 3D space from that entity's position. The `networked-audio-source` component must be added to an entity (or a child of an entity) with the `networked` component.

To quickly get started, try the [Glitch NAF Audio Example](https://naf-examples.glitch.me/basic-audio.html).

To mute/unmute the microphone, you can use the following API (easyrtc and janus adapters):

```javascript

NAF.connection.adapter.enableMicrophone(enabled)

```

where `enabled` is `true` or `false`.

### Video

After adding `video: true` (not needed for the janus adapter) to the `networked-scene` component (and using an adapter that supports it) you will not see any video by default. Though the video will be streaming, it will not be visible until an entity using a mesh (`` for example) with a `networked-video-source` is created. The video from the owner of this entity will be visible in 3D space from that entity's position. The `networked-video-source` component must be added to an `` child entity of an entity with the `networked` component.

This currently applies only to the easyrtc and janus adapters that supports the `getMediaStream(clientId, type="video")` API.

See the [Video Streaming](https://github.com/networked-aframe/networked-aframe/blob/master/examples/basic-video.html) example

that shows the user camera without audio.

To disable/reenable the camera, you can use the following API (easyrtc adapter only):

```javascript

NAF.connection.adapter.enableCamera(enabled)

```

where `enabled` is `true` or `false`.

With the easyrtc adapter, you can add an additional video track like a screen

share with the `addLocalMediaStream` and `removeLocalMediaStream` API:

```javascript

navigator.mediaDevices.getDisplayMedia().then((stream) => {

  NAF.connection.adapter.addLocalMediaStream(stream, "screen");

});

```

```javascript

NAF.connection.adapter.removeLocalMediaStream("screen");

```

See the [Multi Streams](https://github.com/networked-aframe/networked-aframe/blob/master/examples/basic-multi-streams.html) example

that uses a second plane with `networked-video-source="streamName: screen"` to

show the screen share to the other participants.

Be sure to look at the comments at the end of the html file of this example for known issues.

### Misc

```javascript

NAF.connection.isConnected()

```

Returns true if a connection has been established to the signalling server.

```javascript

NAF.connection.getConnectedClients()

```

Returns the list of currently connected clients.

### Options

```javascript

NAF.options.updateRate

```

Frequency the network component `sync` function is called, per second. 10-20 is normal for most Social VR applications. Default is `15`.

```javascript

NAF.options.useLerp

```

By default when an entity is created the [`buffered-interpolation`](https://github.com/InfiniteLee/buffered-interpolation) library is used to smooth out position, rotation and scale network updates. Set this to false if you don't want this feature to be used on creation.

Offline usage

-------------

NAF already includes easyrtc thus running `npm run dev` will provide a fully working solution without accessing an external server. The examples though do rely on both AFrame and other dependencies that not packaged with NAF. Consequently one would have to first [adapt AFrame to work offline](https://aframe.io/docs/1.4.0/introduction/faq.html#can-i-use-a-frame-offline-or-self-hosted) then do the same for all additional components. This basically boils down to downloading the scripts used and their content, e.g assets like 3D models, fonts, etc. It is recommended to load the page while the network console open and identify what requests go outside of the host.

For VR you will also need https as browsers require it for immersive mode. Instructions are provided in the `server/easyrtc-server.js` file. Namely you will have to generate a key and certificate, add them to your local CA then load them via the express server provided by NAF. Make sure to configure that properly at the top of `server/easyrtc-server.js` and enable https itself further down via `https.createServer` as instructed. Once you connect to the NAF server in VR the browser will still complain that the certificate is unknown. You can click on advanced and proceed.

Stay in Touch

-------------

- Join the [A-Frame Slack][slack] and add the #networked-aframe channel

- Follow changes on [GitHub](https://github.com/networked-aframe/networked-aframe/subscription)

- Let us know if you've made something with Networked-Aframe. We'd love to see it!

Help and More Information

------------------------------

* [Getting started tutorial](https://github.com/networked-aframe/networked-aframe/blob/master/docs/getting-started-local.md)

* [Edit live example on glitch.com](https://glitch.com/~naf-project)

* [Live demo site](https://naf-examples.glitch.me)

* [Networked-Aframe Adapters](https://github.com/networked-aframe)

* [A-Frame](https://aframe.io/)

* [WebXR](https://immersiveweb.dev)

* [Open EasyRTC WebRTC library](https://github.com/open-easyrtc/open-easyrtc)

* [Hayden Lee, NAF creator and previous maintainer](https://twitter.com/haydenlee37)

* [Vincent Fretin](https://twitter.com/vincentfretin) is handling new contributions and releases since the version 0.8.0

* Bugs and requests can be filed on [GitHub Issues](https://github.com/networked-aframe/networked-aframe/issues)

Folder Structure

----------------

 * `/ (root)`

   * Licenses and package information

 * `/dist/`

   * Packaged source code for deployment

 * `/server/`

   * Server code

 * `/examples/`

   * Example experiences

 * `/src/`

   * Client source code

 * `/tests/`

   * Unit tests

Roadmap

-------

* More examples!

* [Add your suggestions](https://github.com/networked-aframe/networked-aframe/issues)

Interested in contributing? [Open an issue](https://github.com/networked-aframe/networked-aframe/issues) or send a pull request.

License

-------

This program is free software and is distributed under an [MIT License](LICENSE).