Getting a type error on trying to export armature with animations

Describe the bug I am creating an FPS and using some arms I found with a model of a crossbow I made. The arms themselves will export just fine, and my crossbow does as well. However, once they are posed and I’ve put frames into an animation/action, I can’t export it.

To Reproduce Steps to reproduce the behavior:

1. Go to File -> Export -> gltf 2.0
2. Click on Export gltf 2.0
3. See error

Expected behavior The file exports successfully as a .glb.

Screenshots

Python: Traceback (most recent call last):
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/__init__.py", line 626, in execute
    return gltf2_blender_export.save(context, export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_export.py", line 46, in save
    json, buffer = __export(export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_export.py", line 63, in __export
    __gather_gltf(exporter, export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_export.py", line 75, in __gather_gltf
    active_scene_idx, scenes, animations = gltf2_blender_gather.gather_gltf2(export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather.py", line 39, in gather_gltf2
    animations += __gather_animations(blender_scene, export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather.py", line 83, in __gather_animations
    animations_, merged_tracks = gltf2_blender_gather_animations.gather_animations(_blender_object, merged_tracks, len(animations), export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animations.py", line 76, in gather_animations
    animation = __gather_animation(blender_action, blender_object, export_settings)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animations.py", line 114, in __gather_animation
    channels=__gather_channels(blender_action, blender_object, export_settings),
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animations.py", line 149, in __gather_channels
    return gltf2_blender_gather_animation_channels.gather_animation_channels(
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_cache.py", line 65, in wrapper_cached
    result = func(*args)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_channels.py", line 74, in gather_animation_channels
    channel = __gather_animation_channel(
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_channels.py", line 202, in __gather_animation_channel
    sampler=__gather_sampler(channels, blender_object, export_settings, bake_bone, bake_channel, bake_range_start, bake_range_end, action_name, driver_obj),
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_channels.py", line 254, in __gather_sampler
    return gltf2_blender_gather_animation_samplers.gather_animation_sampler(
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_cache.py", line 65, in wrapper_cached
    result = func(*args)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py", line 67, in gather_animation_sampler
    input=__gather_input(channels, blender_object_if_armature, non_keyed_values,
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_cache.py", line 65, in wrapper_cached
    result = func(*args)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_samplers.py", line 235, in __gather_input
    keyframes = gltf2_blender_gather_animation_sampler_keyframes.gather_keyframes(blender_object_if_armature,
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_cache.py", line 65, in wrapper_cached
    result = func(*args)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py", line 231, in gather_keyframes
    mat = get_bone_matrix(
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_cache.py", line 90, in wrapper_bonecache
    result = func(*args)
  File "/usr/share/blender/2.93/scripts/addons/io_scene_gltf2/blender/exp/gltf2_blender_gather_animation_sampler_keyframes.py", line 159, in get_bone_matrix
    bpy.context.scene.frame_set(frame)
TypeError: Scene.frame_set(): error with argument 1, "frame" -  Function.frame expected an int type, not float

location: <unknown location>:-1

.blend file/ .gltf https://1.filedit.ch/1/VlLYnIJHjXzUJNoXXIkN.blend

Version

• OS: Void Linux
• Blender Version: 2.93.5

Additional context Is it possible I have an outdated version of this addon? Version shows as 1.6.16. This is more than likely me not realizing something with an animation lol, but I can’t seem to find a solution 😕

[scurest]

Ok, that explains it.

The frame variable is indeed a float (it ultimately comes from fcurve.range), while scene.frame_set is documented to take an integer.

If I run C.scene.frame_set(1.0) in my Blender (Python 3.9) I get

<blender_console>:1: DeprecationWarning: an integer is required (got type float).
Implicit conversion to integers using __int__ is deprecated,
and may be removed in a future version of Python.

So I’m guessing this has actually been removed in 3.10.

Since some distros are ahead of the curve on their Python version, this should hopefully be fixed soon (before 3.0) to avoid a repeat of #1295. The quickest fix is just to replace it with frame_set(int(frame)) since the deprecation warning indicates that is what the current code is actually doing.

[chongma]

I had the same problem on Fedora 35 with default version of blender 2.93.5 with python 3.10. i changed to flatpak version 2.93.6 and everything works now