Bpy.ops.export_scene.fbx exports non deforming bones too

Coding Python Support
1

Hi,

from the doc,

https://docs.blender.org/api/current/bpy.ops.export_scene.html

use_armature_deform_only should make the FBX export operator, export only deforming bones

but it does not (unreal import)

image

I use batex exporter, and the option is enabled

image
image755×368 57.2 KB

and my controller bones deform flags are off

image

  • so am I missing something here ? is it a bug ?
  • should I be worried about unreal perfs while it imports “unused” bones

thanks

2

As stated in this post, you need to disable all of your armature’s bones, deform flags. Not just your main armature’s deform flag, which by design, only toggles the first bone’s deform flag.

Here’s a script to set all deform flags at once for a stated armature.

import bpy

OBJ = "Armature"

for b in bpy.data.armatures[OBJ].bones:
    b.use_deform = False

Note: I’ve tested this deform all solution and it works.

3

they are already set as non-deforming (cfr screenshot)

the issue was somewhere else, I wrote my own script anyway