Hi, some GLTF characters have their bone positions and/or rotations messed up. I can’t say what’s exactly wrong, but BoneAxesViewer also gets it wrong. That’s regression in v5. Playground: Babylon.js Playground [image]

[image] Deltakosh: ( @bghgary I think we should document that and how it works in the skeleton documentation) Maybe we need a link. I documented how this works for gltf here: glTF 2.0 Skinning | Babylon.js Documentation

Even better: GLTF character bone positions | Babylon.js Playground (babylonjs.com) I’m using node.getTransformNode() on the root bone to get the mesh to use with BoneAxesViewer

… and that seems to be container.skeletons[0].bones[0].getTransformNode() - at least as far as BoneAxisViewer is concerned, at least in the playground :slight_smile: Locally I have a twilight zone: two BoneAxisViewers, for upper and lower leg, and they work fine as long as I update lower one first …

I have update on this: GLTF character bone positions | Babylon.js Playground (babylonjs.com) This looks fine; but create root mesh and bone absolute position goes way away. So really, what do I need to do to get actual bone position?

[image] Josip_Almasi: This looks fine; but create root mesh and bone absolute position goes way away. Sorry, I’m not understanding this. What do you mean?

@bghgary see the playground above, in particular // replace this with with that to mess it up var root = container.meshes[0]; //var root = container.createRootMesh(); and var absolutePos = bone.getAbsolutePosition(transform); console.log…

You would need to force computing the world matrices if you do changes before using them: https://playground.babylonjs.com/#H925CH#8

Oh dang, but on transform node! I’ve been trying on bone :slight_smile: Alright thanks @sebavan

What a mess :grin: Took me quite a while to pinpoint where things have gone wrong, had to look for babylon 4 on cdns to compare. So Bone.getAbsolutePosition() used to return: {X: 0.1375466307330413 Y:1.6750438330035953 Z:0.01731602581149172} with babylon 4, and with 5 returns {X: 0.137547057815…

Inconsistent GLTF bone transformations

Bugs

bghgary April 29, 2022, 5:58pm 10

Sorry, I’m not understanding this. What do you mean?

BoneAxesViewer does not follow bones?!?

Topic		Replies	Views
How to set position, rotation, scale of bones Questions gltf , skeleton	25	3826	June 8, 2022
BABYLON.BoneIKController With GLTF Mesh Questions	52	2083	March 14, 2022
GLTF Skeletons And Transform Nodes Questions	11	5114	May 2, 2019
Return to Rest not Behaving as Expected? Questions	79	4648	October 20, 2020
Beginner question: pose editor - rotation Questions rotationaxis	37	1342	March 10, 2023

Inconsistent GLTF bone transformations

Related topics