🔍 Useful resources for working with glTF

To inspect glTF or glb files online:

• gltf.report - three.js based
• modelviewer.dev/editor - three.js based
• Khronos glTF Sample Viewer
• Babylon Sandbox
• glTF Validator

To inspect them locally:

• use the glTF Shell Extension for Windows to convert between glTF and glb
• use the glTF Tools VS Code Extension to see validation errors and in-engine previews locally

🔖 Built-in URL parameters

Debug Flags can be appended as URL query parameters.
Use ?help to get a list of ALL parameters available.

Here are some of the most commonly used:

• help print all available url parameter in the console
• console opens an on-screen dev console, useful for mobile debugging
• printGltf logs loaded gltf files to the console
• debug shows transform gizmos (if any)
• debugavatar=<avatarid> instantiates one debug avatar in center of world
• debugphysics shows physics colliders
• gizmos enables gizmo rendering (e.g. when using BoxCollider or AxesHelper components)
• and a lot more: please use help to see them all

🍃 Local Testing of release builds

• First, install http-server: npm install -g http-server
• make a build (development or production)
• open the dist directory with a commandline tool
• run http-server -g | -g enables gzip support
• optional: if you want to test WebXR, generate a self-signed SSL certificate, then run http-server -g -S to enable https (required for WebXR).

📱 Mobile

Android Debugging

For Android debugging, you can attach Chrome Dev Tools to your device and see logs right from your PC. You have to switch your device into development mode and connect it via USB.

See the official chrome documentation here

• Make sure Developer Mode is enabled on your phone
• Connect your phone to your computer via USB
• Open this url in your browser chrome://inspect/#devices
• On your mobile device allow the USB connection to your computer
• On your computer in chrome you should see a list of open tabs after a while (on chrome://inspect/#devices)
• Click Inspect on the tab you want to debug

iOS Debugging

For easy iOS debugging add the ?console URL parameter to get a useful on-screen JavaScript console.

If you have a Mac, you can also attach to Safari (similar to the Android workflow above).

WebXR usage and debugging on iOS requires using a third-party browser: Mozilla WebXR Viewer.

Quest Debugging

Quest is just an Android device - see the Android Debugging section for steps.