Import FACS from FBX for BVH

[bouich jules]

Hi!

Doing extensive test on BVH which i think is simply become the #1 retarget addon on the internet.

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A small bug i discovered, is if i import a file and my Scene format rate is 24 it will automatic change it to 30

and this crash will appear if i try change it back and do it again.

Blender 4.1

Thank you!

[Thomas Larsson]

This bug might already be fixed in 1586efc.

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[bouich jules]

Hi Thomas, please note that the frame rate of the Scene is always FORCED to change to 30 fps, even if initially it was 24 fps

Did multiple test so the crash will pop up only if the bone are not posable, when you make all bones posable then you import FBX to facs you won’t get the crash

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tested with the last build.

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Thank you!

[bouich jules]

Actually not only the FACS but any FBX animation will force change my frame rate to 30 fps.. i believe it’s maybe a normal behavior then?

[bouich jules]

also i noticed those quick facial movement:

https://streamable.com/x4qtpa

seems like it “vibrate” probably the fps causing this.

[Thomas Larsson]

The frame time is specified in the bvh file. E.g., in the Mixamo file you provided the bvh file contains the lines

MOTION
Frames: 641
Frame Time: 0.033333

which indeed corresponds to 30 FPS. However, apparently keyframes still end up on integer frames. Will look into that.

The crash is hopefully gone now. Each button starts by going into object mode. However, if there is no active object, or if the active object is hidden or belongs to an excluded collection, that will cause a polling error. Hopefully fixed in all cases now.

[bouich jules]

Hi Thomas

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Crash is still there, importat G9 -) import standard morph -) BVH import facs from fbx

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[Alessandro Padovani]

bvh 2.2.0027, blender 4.1.1

I can confirm the crash.

steps:

1. easy import G9 with FACS
2. select G9, then import facs from fbx file

Traceback (most recent call last):
File "C:\Users\Alessandro\AppData\Roaming\Blender Foundation\Blender\4.1\scripts\addons\retarget_bvh\utils.py", line 433, in execute
self.sequel(context, data)
File "C:\Users\Alessandro\AppData\Roaming\Blender Foundation\Blender\4.1\scripts\addons\retarget_bvh\utils.py", line 445, in sequel
bpy.ops.object.mode_set(mode=self.mode)
File "C:\Program Files\blender-4.1.1-windows-x64\4.1\scripts\modules\bpy\ops.py", line 109, in call
ret = _op_call(self.idname_py(), kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Operator bpy.ops.object.mode_set.poll() Context missing active object

p.s. @Bouich, as noted in the installation docs you have to rename the folders, so it’s “retarget_bvh“. Also I’m not sure that using the “admin“ user is a good thing.

[Thomas Larsson]

But now the crash should be gone.

[Alessandro Padovani]

bvh 2.2.0030

The crash is gone now it imports fine. As for the “quick facial movoments“, they’re in the original file as well so they are imported correctly. We can clearly see them by importing the fbx with blender then parenting a camera to the head bone.

steps:

1. import fbx with blender
2. parent a camera to the head bone
3. watch the face animation

If there’s nothing to add we can close as resolved.

[bouich jules]

no crash now works perfect.