Babylon.js 7 scene.useRightHandedSystem = true - does not work

Lukasz_Karluk · January 29, 2025, 8:57am

In Babylon.js 7 scene.useRightHandedSystem = true - does not work.
inspecting the camera.rotationQuaternion reveals NaN values.
works fine if useRightHandedSystem is false.

to replicate we have been using the github sample:

github.com/8thwall/web

examples/babylonjs/placeground/index.js

master

/* globals BABYLON TWEEN XR8 XRExtras */

const modelRootURL = './'                               // Directory where 3D model lives
const modelFile = 'tree.glb'                            // 3D model to spawn at tap
const startScale = new BABYLON.Vector3(0.1, 0.1, -0.1)  // Initial scale value for our model
const endScale = new BABYLON.Vector3(2.0, 2.0, -2.0)    // Ending scale value for our model
const animationMillis = 750                             // Animate over 0.75 seconds

let surface, engine, scene, camera

// Populates some object into an XR scene and sets the initial camera position.
const initXrScene = () => {
  const directionalLight = new BABYLON.DirectionalLight(
    'DirectionalLight',
    new BABYLON.Vector3(0, -1, 1),
    scene
  )
  directionalLight.intensity = 1.0

  const ground = BABYLON.Mesh.CreatePlane('ground', 100, scene)

This file has been truncated. show original

index.html - update babylon version to 7+ (ie, we’re using 7.45.0)
index.js - update BABYLON.SceneLoader.ImportMesh to BABYLON.SceneLoader.ImportMeshAsync (so it works in babylon.js 7)
run with useRightHandedSystem = false - works.
run with useRightHandedSystem = true - fails
inspect the camera rotationQuaternion when using right handed system

Lukasz_Karluk · January 30, 2025, 12:56am

hi, any idea when this issue can be addressed.
currently its blocking us from using 8w on our project.

GeorgeButler · January 30, 2025, 4:55pm

Looking into this now.

Lukasz_Karluk · February 4, 2025, 3:11am

hi, checking in on this, any updates? thanks!

Lukasz_Karluk · February 20, 2025, 2:00am

Hi, since this is not getting much attention, is it possible to do the 8thwall initialisation in a babylon.js project manually? is it possible to create a custom version of XR8.Babylonjs.xrCameraBehavior() in the below code.

camera.addBehavior(XR8.Babylonjs.xrCameraBehavior(), true)

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Babylon.js 7 scene.useRightHandedSystem = true - does not work

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