Gltf-blender-io: Animation export is broken

[ZanQdo]

Describe the bug
Simple animation is not exported correctly from Blender

To Reproduce
Export an animated cube and import back.
The action is not imported at all.

When opening the file on https://sandbox.babylonjs.com/ the action will be present but the animation count will be 0, and the end frame will be a negative value. The action will not play.

These files where created with a recent Blender 2.8 build

.blend file
AnimExport.zip

.gltf file
anim.zip

Version

• Blender Version 2.80 (2019-07-08)

[MiikaH]

The attached .gltf file seems to contain two duplicated versions of the node. Both share identical name and mesh, but only other one is animated. Only the non-animated version is included in the scene.

[ZanQdo]

Confirmed, after manually removing duplicate nodes the files load correctly

[pjoe]

Seems to be caused by #561. The node cache breaks because the animation gather now calls with different params (None for blender_scene) and then creates a new node instead of using the existing one :S

[ZanQdo]

I hope this can be fixed soon before the Blender RC since animation export is completely broken even on the simplest of cases

[emackey]

The RC is due out today. I don't think this fix is going in RC1, but I would expect some more bugs & fixes to come in before the next Release Candidate comes along.

[jedStevens]

I would also like to chime in about the broken animation.

Here is a gif showing what the animation looks like after it has been imported to the Godot engine. When I import it back into blender there is no animation at all, but I mostly care about getting my animations out of blender.

This just seems wrong. I'm noticing that the bouncing up and down in the torso should instead be a rotation as I didn't animate an idle cycle this terrible.

Any ideas?

[julienduroure]

@jedStevens Please report a complete bug report, as requested :

• provide a .blend file
• what export options are you using ?

Please first test with "always sample animations" option at export.

[julienduroure]

This is now fixed here.
Here is info about merge into blender : https://lists.blender.org/pipermail/bf-committers/2019-July/050047.html
(we are in master freeze, so I hope it will be merged before release)

[ZanQdo]

@julienduroure Thank you

[ZanQdo]

@julienduroure it appears we got the goahead https://lists.blender.org/pipermail/bf-committers/2019-July/050050.html