o3d

O3D - Model Viewer for Flutter

This is a Flutter widget for rendering interactive 3D models in the glTF and GLB formats. The widget embeds Google's <model-viewer> web component in a WebView.

Screenshot

online demo 1: https://babakcode.github.io/ui_3d_test/ / source code

online demo 2: https://babakcode.github.io/ui_3d_flutter/ / source code

Features

1. O3DController controller = O3DController();
2. cameraTarget: use controller.cameraTarget(20, 20, 5) x, y, z
3. cameraOrbit: use controller.cameraOrbit(1.2, 1, 4) (theta)deg, (phi)deg, (radius)m
4. availableAnimations: use controller.availableAnimations().then((animations) => log("Available animations: $animations"));
5. play: use controller.play() [optional] repetitions => play(repetitions: 2)
6. pause: use controller.pause()
7. Renders glTF and GLB models. (Also, USDZ models on iOS 12+.)
8. Supports animated models, with a configurable auto-play setting.
9. Optionally supports launching the model into an AR viewer.
10. Optionally auto-rotates the model, with a configurable delay.
11. Supports a configurable background color for the widget.

Installation

in pubspec.yaml

dependencies:
  o3d: ^3.1.0

AndroidManifest.xml (Android 9+ only)

Test on real device and to use this widget on Android 9+ devices, your app must be permitted to make an HTTP connection to http://localhost:XXXXX. Android 9 (API level 28) changed the default for android:usesCleartextTraffic from true to false, so you will need to configure your app's android/app/src/main/AndroidManifest.xml as follows:

+    <uses-permission android:name="android.permission.INTERNET"/>

     <application
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher"
        android:label="example"
+       android:usesCleartextTraffic="true">
        <activity
            android:name=".MainActivity"

This does not affect Android 8 and earlier.

app/build.gradle (Android only)

Change minSdkVersion to 21.

defaultConfig {
    ...
    minSdkVersion 21
    ...
}

Info.plist (iOS only)

To use this widget on iOS, you need to opt-in to the embedded views preview by adding a boolean property to your app's ios/Runner/Info.plist file, with the key io.flutter.embedded_views_preview and the value YES:

<key>io.flutter.embedded_views_preview</key><true />

web/index.html (Web only)

Modify the <head> tag of your web/index.html to load the JavaScript, like so:

<head>
    <!-- Other stuff -->
    <script type="module" src="./assets/packages/o3d/assets/model-viewer.min.js" defer></script>
</head>

Examples

Importing the library

import 'package:o3d/o3d.dart';

Creating a O3D widget

class _MyHomePageState extends State<MyHomePage> {
  
  // to control the animation
  O3DController controller = O3DController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
        actions: [
          IconButton(
              onPressed: () => 
                  controller.cameraOrbit(20, 20, 5),
              icon: const Icon(Icons.change_circle)),
          IconButton(
              onPressed: () =>
                  controller.cameraTarget(1.2, 1, 4), 
              icon: const Icon(Icons.change_circle_outlined)),
        ],
      ),
      body: O3D.asset(
         src: 'assets/glb/jeff_johansen_idle.glb', 
         controller: controller,
      ),
    );
  }
}

Loading a bundled Flutter asset

O3D.asset(
  src: 'assets/MyModel.glb',
  // ...
),

Loading a model from the web

body: O3D.network(
   src:'https://modelviewer.dev/shared-assets/models/Astronaut.glb',
   // ...
),

Loading a model from the file system

This is not available on Web.

class HomePage extends StatelessWidget {
   const HomePage({super.key});
   
   @override
   Widget build(BuildContext context) {
      return O3D(src: 'file:///path/to/MyModel.glb',
      // ...
      );
   }
}

projects

Compatibility

• Android
• iOS (AR View may not available on iOS 16+)
• Web, with a recent system browser version.

Notes

We use the Google APP , com.google.android.googlequicksearchbox to display interactive 3D models on Android. The model displays in 'ar_preferred' mode by default, Scene Viewer launches in AR native mode as the entry mode. If Google Play Services for AR (ARCore, com.google.ar.core) isn't present, Scene Viewer gracefully falls back to 3D mode as the entry mode.

Note that due to browsers' CORS security restrictions, the model file must be served with a Access-Control-Allow-Origin: * HTTP header.

Frequently Asked Questions

Q: Why doesn't my 3D model load and/or render?

A: There are several reasons why your model URL could fail to load and render:

1. It might not be possible to parse the provided glTF or GLB file. Some tools can produce invalid files when exporting glTF. Always run your model files through the glTF Validator to check for this.