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strip_skin: export GLB not FBX — Blender 5 FBX exporter flattens slotted actions

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This was the entire 'MIRPAMO retarget is mushy' mystery: the retarget math
was fine, the converted clips were flat.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
m3ultra 2026-07-29 14:39:58 +10:00
parent c3d682b7dd
commit b033879963
1 changed files with 26 additions and 4 deletions
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30
pipeline/strip_skin.py
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@ -23,7 +23,9 @@ out = Path(args.out).expanduser()
out.mkdir(parents=True, exist_ok=True)
for clip in args.clips.split(","):
clip = Path(clip).expanduser()
dest = out / clip.name
# GLB out: Blender 5's FBX exporter flattens slotted actions to identity;
# the glTF exporter is slot-native and MIRPAMO imports glb clips fine.
dest = (out / clip.name).with_suffix(".glb")
if dest.exists():
print("SKIP", clip.name)
continue
@ -33,13 +35,33 @@ for clip in args.clips.split(","):
if o.type == "MESH":
bpy.data.objects.remove(o, do_unlink=True)
# normalise numbered Mixamo namespaces (mixamorig7: -> mixamorig:) so
# downstream mappers (MIRPAMO retarget) match by exact name
# downstream mappers (MIRPAMO retarget) match by exact name.
# NOTE: bone rename does NOT fix up slotted-action fcurve paths in
# Blender 5 — rewrite them explicitly or the action drives nothing.
import re
def all_fcurves(act):
if hasattr(act, "fcurves") and len(getattr(act, "fcurves", [])):
return list(act.fcurves)
out = []
for layer in act.layers:
for strip in layer.strips:
for cb in strip.channelbags:
out.extend(cb.fcurves)
return out
for o in bpy.data.objects:
if o.type == "ARMATURE":
for b in o.data.bones:
b.name = re.sub(r"^mixamorig\d+:", "mixamorig:", b.name)
bpy.ops.export_scene.fbx(filepath=str(dest), use_selection=False,
add_leaf_bones=False, bake_anim=True)
for act in bpy.data.actions:
for fc in all_fcurves(act):
if '"' in fc.data_path:
bone = fc.data_path.split('"')[1]
fixed = re.sub(r"^mixamorig\d+:", "mixamorig:", bone)
if fixed != bone:
fc.data_path = fc.data_path.replace('"%s"' % bone, '"%s"' % fixed)
bpy.ops.export_scene.gltf(filepath=str(dest), export_format="GLB",
export_animations=True)
print("STRIPPED", clip.name)
print("DONE")