How do I access the transformedPosition of objects?

Questions
1

I am trying to get the position of a light from a GLTF file so I can position a sphere created in Babylonjs in the same place.

The x, y, z position of the light are all 0 so I can’t use that.

The transformedPosition coordinates are correct and I can see them in chrome inspector, but when I console.log it, it comes out as undefined. I’m not sure why. How can I get those coordinates?

Thanks

2

Could you create a repro in the playground ? it sounds hard to help without it ?

3

Hello @mpg just checking in if you still have an issue and if so, if you can provide us with a Babylon.js Playground (babylonjs.com) example so we can help further.

4

Hello @carolhmj, @sebavan,

I am sorry for such a late reply. I got overwhelmed with stuff to do.

Here is an example of what I mean:

See the comments for my question and the screenshot for what Chrome inspector shows.

Screenshot 2022-04-16 160748
Screenshot 2022-04-16 160748641×613 34.8 KB

The problem was that I couldn’t access the xyz coordinates of the light from the gltf file.

I already found a solution to get the xyz, but there are things I don’t understand still. Please see the comments in the code.

Thanks

5

Seems that in your GLB model light position and light rotation are made with the help of TransformNode.
You may check these lines at https://playground.babylonjs.com/#R2B8EF#10


console.log(scene.getTransformNodeByName("Light").position)
console.log(scene.getTransformNodeByName("Light").rotationQuaternion)

Please note that there is also another TransformNode Light_Orientation which has rotation -90 degrees in X axis.

1 Like
6

Thank you!