model_viewer_pro 1.0.1

Display and control interactive 3D models (GLB/GLTF) in Flutter — mesh manipulation, camera control, animations, grounded environments, and custom lighting. Built on model_viewer_plus.

model_viewer_pro

Display and control interactive 3D models (GLB / GLTF) in Flutter with fine-grained mesh manipulation, camera control, animations, grounded environments, and custom lighting.

Built on top of model_viewer_plus, this package adds a full Dart API for runtime scene control that the base package does not provide.

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Features

🎨 Mesh control	Discover, show/hide, and recolour meshes by name
📷 Camera	Orbit, target, FOV, zoom in/out, auto-rotate, reset
🌄 Environment & Skybox	Set HDR/equirectangular images from URL or Flutter assets
🌍 Grounded mode	Project the skybox onto a ground plane for realistic scenes
💡 Lighting	Shadow intensity/softness, exposure, background colour
🎬 Animations	Play, pause, seek, get duration
📸 Screenshot	Capture the current frame as a PNG data URI
⚡ Performance	Batched JS calls, single render-trigger, minimal WebView round-trips

---

Installation

# pubspec.yaml
dependencies:
  model_viewer_pro: ^1.0.0

Then run:

flutter pub get

---

Quick Start

import 'package:model_viewer_pro/model_viewer_pro.dart';

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  final _controller = ModelViewerProController();

  @override
  Widget build(BuildContext context) {
    return ModelViewerProViewer(
      src: 'assets/model.glb',
      controller: _controller,
      cameraControls: true,
      autoRotate: true,
      onLoad: (meshes) {
        print('Loaded meshes: $meshes');
      },
    );
  }
}

Don't forget to declare your model asset in pubspec.yaml:

flutter:
  assets:
    - assets/model.glb

---

ModelViewerProViewer — Widget Reference

Required

Parameter	Type	Description
src	String	Path or URL to the model file (.glb or .gltf).

Controller & Callbacks

Parameter	Type	Default	Description
controller	ModelViewerProController?	null	Controller for runtime mesh, camera, and lighting operations.
onLoad	Function(List<String>)?	null	Called once the model loads with discovered mesh names.

Appearance

Parameter	Type	Default	Description
backgroundColor	Color	Colors.transparent	Background colour of the viewer.
shadowIntensity	double?	null (1.0 when grounded)	Shadow darkness. 0.0 = none.
shadowSoftness	double?	null	Shadow blur. 0.0 = sharp, 1.0 = soft.
exposure	double?	null	Scene brightness. 1.0 = default.

Environment & Skybox

Parameter	Type	Default	Description
environmentImageUrl	String?	null	URL to HDR/equirectangular image for reflections.
skyboxImagePath	String?	null	URL or asset path to equirectangular image for 360° background.
grounded	bool?	null	Projects skybox onto a ground plane. See Grounded Mode.
skyboxHeight	String?	null ("1.5m" when grounded)	Height at which the skybox terminates, e.g. "1.5m".

Camera

Parameter	Type	Default	Description
cameraOrbit	String?	null	Initial camera position, e.g. "45deg 55deg 2m".
cameraTarget	String?	null	Look-at point, e.g. "0m 1m 0m".
fieldOfView	String?	null	FOV, e.g. "30deg".
minFieldOfView	String?	null	Min FOV clamp.
maxFieldOfView	String?	null	Max FOV clamp.
maxCameraOrbit	String?	null ("auto 90deg auto" when grounded)	Max orbit constraint.
minCameraOrbit	String?	null	Min orbit constraint.

Interaction

Parameter	Type	Default	Description
cameraControls	bool	true	Enable camera orbit via drag.
autoRotate	bool	false	Continuous auto-rotation.
disablePan	bool?	null (true when grounded)	Disable two-finger pan / middle-mouse.
disableZoom	bool?	null	Disable pinch-zoom / scroll wheel.
disableTap	bool?	null	Disable tapping the model.
touchAction	String?	null	CSS touch-action, e.g. "pan-y".

Model Loading

Parameter	Type	Default	Description
ar	bool	false	Show the AR button.
autoPlay	bool	false	Auto-play embedded animations.
alt	String?	null	Accessibility alt text.
poster	String?	null	Poster image URL shown while loading.
loading	Loading?	null	Loading behavior: auto, lazy, eager.
reveal	Reveal?	null	Reveal behavior: auto, interaction, manual.

---

Grounded Mode

When grounded: true is set, the skybox is projected onto a virtual ground plane, creating a realistic floor reflection. A skybox or environment image is required.

Automatic Defaults

When grounded is enabled, these sensible defaults are applied unless you explicitly override them:

Attribute	Auto value	Override with
skybox-projection	equirectangular	(always applied)
skybox-height	"1.5m"	skyboxHeight param
shadow-intensity	1.0	shadowIntensity param
max-camera-orbit	"auto 90deg auto"	maxCameraOrbit param
disable-pan	true	disablePan param

If no skyboxImagePath is provided but environmentImageUrl is set, the environment image is automatically used as the skybox.

Example

ModelViewerProViewer(
  src: 'assets/model.glb',
  controller: controller,
  grounded: true,
  skyboxImagePath: 'assets/park.jpg',
  // All defaults applied automatically — override any you need:
  // skyboxHeight: '2m',
  // maxCameraOrbit: 'auto 120deg auto',
  // disablePan: false,
)

---

ModelViewerProController — Runtime API

Create one instance, pass it to ModelViewerProViewer. All methods become active after the onLoad callback fires.

Scene

Method	Returns	Description
waitForSceneReady({int timeoutMs})	Future<bool>	Wait for the 3D scene graph to be accessible.

Mesh

Method	Returns	Description
getAvailableMeshes()	Future<List<String>>	All mesh names in the loaded model.
setVisibility(name, visible)	Future<void>	Show/hide a mesh and all its children.
setTextureColor(name, colorHex)	Future<void>	Change a mesh's base colour (e.g. "#FF0000").

Camera

Method	Returns	Description
setCameraOrbit(theta, phi, radius)	Future<void>	Move camera (degrees/metres).
setCameraTarget(x, y, z)	Future<void>	Set look-at point (metres).
setFieldOfView(fov)	Future<void>	Set FOV (degrees).
getCameraOrbit()	Future<Map?>	Get current orbit values.
resetCamera()	Future<void>	Reset to default position.
zoomIn() / zoomOut()	Future<void>	Zoom by ±20%.
setAutoRotate(enabled)	Future<void>	Toggle auto-rotation.

Environment & Skybox

Method	Returns	Description
setEnvironmentImageFromUrl(url)	Future<bool>	Set reflection image from URL.
setEnvironmentImageFromAsset(path)	Future<bool>	Set reflection image from Flutter asset.
setSkyboxImageFromUrl(url)	Future<bool>	Set 360° background from URL.
setSkyboxImageFromAsset(path)	Future<bool>	Set 360° background from Flutter asset.
setSkyboxHeight(height)	Future<bool>	Set skybox termination height.
removeSkyboxHeight()	Future<bool>	Remove skybox height constraint.

Lighting

Method	Returns	Description
setBackgroundColor(color)	Future<bool>	Set CSS background (e.g. "#000").
setGroundVisibility(visible)	Future<bool>	Show/hide ground shadow.
setShadowIntensity(value)	Future<bool>	Shadow darkness (0–1).
setShadowSoftness(value)	Future<bool>	Shadow blur (0–1).
setExposure(value)	Future<bool>	Scene brightness multiplier.

Interaction Controls

Method	Returns	Description
setDisablePan(disabled)	Future<bool>	Enable/disable panning.
setDisableZoom(disabled)	Future<bool>	Enable/disable zooming.
setDisableTap(disabled)	Future<bool>	Enable/disable tap.
setMaxCameraOrbit(orbit)	Future<bool>	Set max orbit constraint.
setMinCameraOrbit(orbit)	Future<bool>	Set min orbit constraint.
setTouchAction(action)	Future<bool>	Set CSS touch-action.

Animation

Method	Returns	Description
playAnimation()	Future<void>	Start playback.
pauseAnimation()	Future<void>	Pause at current position.
setAnimationTime(seconds)	Future<void>	Seek to a specific time.
getAnimationDuration()	Future<double?>	Total animation duration.

Asset Loading

Method	Returns	Description
loadSkyboxFromAsset(path)	Future<bool>	Load skybox from Flutter asset (base64).
loadEnvironmentFromAsset(path)	Future<bool>	Load environment from Flutter asset.

Utilities

Method	Returns	Description
takeScreenshot()	Future<String?>	Capture frame as PNG data URL.
executeCustomJS(script)	Future<void>	Run arbitrary JavaScript.

---

Performance Tips

1. Use URL images when possible — skyboxImagePath and environmentImageUrl pointing to remote URLs are loaded natively by the WebView and are more efficient than base64-encoded assets.
2. Avoid unnecessary setState — The viewer batches all didUpdateWidget changes into a single JS call to keep round-trips minimal.
3. Wait for onLoad — Perform all controller operations inside or after the onLoad callback to ensure the scene is ready.
4. Keep models small — Compress .glb files and use Draco compression.
5. Use loading: Loading.lazy — Defer loading until the viewer is on screen.

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Supported Platforms

Platform	Status
Android	✅ Supported (6.0+)
iOS	✅ Supported (11.0+)
Web	✅ Supported (via <model-viewer>)

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Architecture & Limitations (Problem Solving)

This package is optimized for zero-latency outfit swapping using a single-file architecture (sub-mesh toggling). This is highly desirable for avatars, mini-games, and simple 3D models where you want instant changes without network requests.

However, be aware of the following limitations:

1. Memory Usage: The entire wardrobe (all meshes and textures, even hidden ones) is loaded into memory at once. If you have dozens of high-resolution clothing items, you may encounter Out-Of-Memory (OOM) crashes on low-end mobile devices.
2. Texture Atlasing: To mitigate memory issues, instruct your 3D artists to use Texture Atlasing (combining multiple clothing textures into a single shared image map).
3. Skeleton Sharing: All clothing items must share the exact same skeletal rig. Clothing that requires entirely different bone structures (e.g., a flowing cape vs. a tight shirt) might cause animation conflicts or inflate the rig complexity.

If your application requires hundreds of distinct, high-resolution clothing pieces, consider a modular loading approach (loading separate GLB files dynamically) instead of packing everything into one file.

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Troubleshooting

• Black screen or infinite loading: Ensure your assets/model.glb is declared in pubspec.yaml and spelled exactly the same (case-sensitive).
• WebViewPlatform.instance != null errors in tests: Because model_viewer_pro relies on native WebViews, headless widget tests (flutter test) will fail. You must use the integration_test package and run tests on a real device or emulator.
• Symlink errors on Windows: If you encounter plugin symlink errors when running the example app, enable Developer Mode in your Windows system settings.

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Launching & Publishing your App

When preparing your Flutter app for release with this package:

1. Model Optimization: Compress your .glb files before launch. Use tools like gltf-pipeline to apply Draco compression. The model-viewer web component natively supports Draco decompression.
2. Web Deployment: If deploying to Flutter Web, no additional configuration is needed. The package uses an iframe <model-viewer> component which handles WebGL natively. Ensure your web server serves .glb files with the correct CORS headers if loading from external URLs.
3. Android Permissions: Native WebView components require internet access if you are loading remote URLs (for the model or skyboxes). Ensure <uses-permission android:name="android.permission.INTERNET" /> is in your AndroidManifest.xml.
4. App Size: Be mindful that large 3D assets bundled locally will drastically increase your .apk/.ipa size. For production apps, host your glb and hdr files on a CDN and load them via URL.

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Migrating from model_viewer_pro_controller

Replace the import:

// Before
import 'package:model_viewer_pro_controller/model_viewer_pro_controller.dart';

// After
import 'package:model_viewer_pro/model_viewer_pro.dart';

Update your pubspec.yaml:

dependencies:
  # Remove:  model_viewer_pro_controller: ...
  model_viewer_pro: ^1.0.0

All class names (ModelViewerProViewer, ModelViewerProController) and method signatures remain identical — no other code changes required.

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License

See LICENSE for details.