ACCESSOR_NON_UNIT error in validator

[AlbertoElias]

I'm exporting a blender scene using the latest add on in master and then opening it in https://gltf-viewer.donmccurdy.com/ and I get the error

Cannot read property 'joints' of undefined

The model has an armature and some animations. I'm attaching the gltf and the blender file. Thanks!

broken_model.zip

[Minek124]

I had same error when multiple meshes are attached to one armature and the solution I found is to join all child meshes.

[donmccurdy]

Transferring to the new repository, https://github.com/KhronosGroup/glTF-Blender-IO.

This model now exports and loads without failing, but the skinning data appears deformed.

[julienduroure]

Skin issue seems to be fixed, but now have gltf error :

ACCESSOR_NON_UNIT

[emackey]

Skin issue seems to be fixed, but now have gltf error :

ACCESSOR_NON_UNIT

I know that one. The model contains degenerate faces, and the exporter doesn't weed them out prior to export, resulting in zero-length normal vectors, which are invalid in glTF.

Quick fix is go into Edit Mode, menu, "Mesh" -> "Clean up" -> "Degenerate Dissolve".

[julienduroure]

Well, this is a duplicate of #1138, let's continue the discussion on the other ticket