# three.ar.js
**Repository Path**: wei_qing_luo/three.ar.js
## Basic Information
- **Project Name**: three.ar.js
- **Description**: three.ar.js学习
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No
## Statistics
- **Stars**: 0
- **Forks**: 1
- **Created**: 2021-03-18
- **Last Updated**: 2021-06-16
## Categories & Tags
**Categories**: Uncategorized
**Tags**: None
## README
# three.ar.js
[](https://travis-ci.org/google-ar/three.ar.js)
[](https://www.npmjs.org/package/three.ar.js)
[](https://www.npmjs.org/package/three.ar.js)
[](https://www.npmjs.org/package/three.ar.js)
**A helper three.js library for building AR web experiences that run in WebARonARKit and WebARonARCore.**
[WebARonARKit] and [WebARonARCore] are experimental apps for iOS and Android that let developers create Augmented Reality (AR) experiences using web technologies. three.ar.js makes it easier to create these experiences by providing helper classes and utilities on top of the [three.js] 3D library, which interfaces with the [WebVR Extension for AR] exposed by [WebARonARKit] and [WebARonARCore]. For example:
* THREE.ARReticle: a visible reticle drawn on the real surface of real world objects.
* THREE.ARPerspectiveCamera: a camera that matches your [three.js] scene to your camera's video feed.
See [three.ar.js API documentation](API.md) for details.
## Installing
### CDN
```html
```
### Script
Download the build at [dist/three.ar.js](dist/three.ar.js) and include it as a script tag in a web page. You must include [three.js] as well, and three.ar.js must be included after.
```html
```
### npm
If you're using a build tool, like [browserify] or [webpack], install it via [npm]. Note you must also have [three.js] installed via npm.
```
$ npm install --save three three.ar.js
```
## Using
Accessing three.ar.js depends on the environment you're working in. Below are examples of importing
the code via script tag, as well as a module bundler like [browserify] or [webpack].
To view the additional APIs implemented by [WebARonARKit] and [WebARonARCore], view the [WebVR Extension for AR] document.
For more examples, see the [examples/](examples/) directory.
See the full [three.ar.js API documentation](API.md) for more details.
### Script
If you are including three.ar.js via script tag, the additional three.ar.js features are appended to the `THREE` namespace, for example:
```js
/**
* Not a full working example -- see the `examples/` directory
*/
THREE.ARUtils.getARDisplay().then(init);
function init(display) {
vrDisplay = display;
// Set up three.js scene
renderer = new THREE.WebGLRenderer({ alpha: true });
scene = new THREE.Scene();
// ...
// Set up our ARView with ARPerspectiveCamera
arView = new THREE.ARView(vrDisplay, renderer);
camera = new THREE.ARPerspectiveCamera(vrDisplay, 60, window.innerWidth / window.innerHeight, vrDisplay.depthNear, vrDisplay.depthFar);
vrControls = new THREE.VRControls(camera);
update();
}
function update() {
// Update our controls/camera, the ARView rendering,
// and our three.js scene
vrControls.update();
arView.render();
renderer.clearDepth();
renderer.render(scene, camera);
vrDisplay.requestAnimationFrame(update);
}
```
### Modules
If you're in a [browserify] or [webpack] like environment, three.ar.js uses [three.js]
as a peer dependency. This means you can import both packages separately.
```js
import { Scene, WebGLRenderer } from 'three';
import { ARUtils, ARPerspectiveCamera, ARView } from 'three.ar.js';
async function init() {
const display = await ARUtils.getARDisplay();
const renderer = new WebGLRenderer({ alpha: true });
const arView = new ARView(display, renderer);
// And so forth...
}
```
## Contributing
If you're developing and modifying the three.ar.js library itself, there are some helpful build tools for you.
### Installing Dependencies
Run `npm install` to install dependencies required for this project.
### Building
Run `npm run build` to create a new build in `./dist`. When sending pull requests, do **not** build your changes and allow maintainers to do so. There are additional commands for building, like `npm run build-min` for building the minified file, and `npm run build-all` for building both.
To auto build when the source changes, run `npm run watch`.
### Linting
Run `npm run lint` to run the linter on code in `src/`.
### Testing
Right now, there are only linting tests. To run the tests, execute:
```
$ npm test
```
For testing functionality, go through the examples with your changes and ensure the expected functionality.
### Releasing a new version
For maintainers, to cut a new release for npm, use the [npm version] command. The `preversion`, `version` and `postversion` npm scripts will run tests, build, add built files and tag to git, push to github, and publish the new npm version.
`npm version `
You should be sure that `git push` pushes to the origin repository if you're working in a fork. See the `postversion` npm script, and that you have access to both the repo and npm package.
## Examples
Examples of three.ar.js are in the `/examples` directory.
A [list of examples](https://developers.google.com/ar/develop/web/getting-started#examples) that are compatible with [WebARonARKit] and [WebARonARCore] is also available at [developers.google.com].
Created a cool example or want to see more from the community? Check out [this gist](https://gist.github.com/jsantell/871d7e709e5007533f3bf07c35434e29) with some links. Leave a comment to add yours!
## License
Apache License Version 2.0 (see the `LICENSE` file inside this repo).
[three.js]: https://threejs.org/
[adb]: https://developer.android.com/studio/command-line/adb.html
[npm]: https://www.npmjs.com
[browserify]: http://browserify.org/
[webpack]: https://webpack.github.io/
[WebARonARKit]: https://github.com/google-ar/WebARonARKit
[WebARonARCore]: https://github.com/google-ar/WebARonARCore
[developers.google.com]: https://developers.google.com/ar/develop/web/getting-started#examples
[WebVR Extension for AR]: webvr_ar_extension.md
[npm version]: https://docs.npmjs.com/cli/version