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?!?

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Inconsistent GLTF bone transformations

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