Cannot create rigify rig from vrm rig

[Qwack-exe]

I get an error when I use the Menu Search and click Generate Rigify armature for VRM model:

[rblz]

Same error from me. Using latest version of vrm-rigify with Blender 4.5.2. Using 3.13 of VRM import addon. Also tested with Avatar Toolkit importer, no luck.

[rblz]

Fix:

metarig_bone = getattr(metarig_human_bones, bone_type).node
vrm_bone = getattr(vrm_human_bones, bone_type).node

replace with:

metarig_bone_attr = getattr(metarig_human_bones, bone_type, None)
vrm_bone_attr = getattr(vrm_human_bones, bone_type, None)
if (
    hasattr(metarig_bone_attr, "node") and
    hasattr(vrm_bone_attr, "node")
):
    metarig_bone = metarig_bone_attr.node
    vrm_bone = vrm_bone_attr.node
    if hasattr(vrm_bone, "bone_name") and vrm_bone.bone_name:
        bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name))

Tested Blender 4.5.2 latest version of plugin.

[Naitrate]

Fix:

metarig_bone = getattr(metarig_human_bones, bone_type).node
vrm_bone = getattr(vrm_human_bones, bone_type).node

replace with:

metarig_bone_attr = getattr(metarig_human_bones, bone_type, None)
vrm_bone_attr = getattr(vrm_human_bones, bone_type, None)
if (
    hasattr(metarig_bone_attr, "node") and
    hasattr(vrm_bone_attr, "node")
):
    metarig_bone = metarig_bone_attr.node
    vrm_bone = vrm_bone_attr.node
    if hasattr(vrm_bone, "bone_name") and vrm_bone.bone_name:
        bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name))

Tested Blender 4.5.2 latest version of plugin.

This seems to aleviate the error that I was having, but now another one arises:

Python: Traceback (most recent call last):
  File "/home/USER/.config/blender/4.5/scripts/addons/vrm_rigify/__init__.py", line 225, in rename_rig_bones_to_match_vrm_model_vertex_groups
    rig_bone = armature_rig.edit_bones[f"DEF-{metarig_bone_name}"]
               ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'bpy_prop_collection[key]: key "DEF-spine" not found'

[nonchang-net]

@rblz
正常動作しました。ありがとう。
It worked properly. Thank you.

@KingKrouch
少し注意点があるようですね。その次のif文も含めて置き換えましょう。
There seems to be a slight caveat. Let's try replacing it, including the next if statement.

    # Compute a bone mapping between the metarig
    # and VRM model based on VRM bone types.
    bone_mapping = []
    for bone_type in metarig_human_bones.keys():
        if bone_type in ["last_bone_names", "initial_automatic_bone_assignment"]:
            continue

        # metarig_bone = getattr(metarig_human_bones, bone_type).node # ⭐️
        # vrm_bone = getattr(vrm_human_bones, bone_type).node # ⭐️
        # if vrm_bone.bone_name: # ⭐️
        #     bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name)) # ⭐️

        #  =============== replace start👌
        metarig_bone_attr = getattr(metarig_human_bones, bone_type, None)
        vrm_bone_attr = getattr(vrm_human_bones, bone_type, None)
        if (
            hasattr(metarig_bone_attr, "node") and
            hasattr(vrm_bone_attr, "node")
        ):
            metarig_bone = metarig_bone_attr.node
            vrm_bone = vrm_bone_attr.node
            if hasattr(vrm_bone, "bone_name") and vrm_bone.bone_name:
                bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name))
        #  =============== replace end👌
                
    return bone_mapping

[Naitrate]

@rblz 正常動作しました。ありがとう。 It worked properly. Thank you.

@KingKrouch 少し注意点があるようですね。その次のif文も含めて置き換えましょう。 There seems to be a slight caveat. Let's try replacing it, including the next if statement.

    # Compute a bone mapping between the metarig
    # and VRM model based on VRM bone types.
    bone_mapping = []
    for bone_type in metarig_human_bones.keys():
        if bone_type in ["last_bone_names", "initial_automatic_bone_assignment"]:
            continue

        # metarig_bone = getattr(metarig_human_bones, bone_type).node # ⭐️
        # vrm_bone = getattr(vrm_human_bones, bone_type).node # ⭐️
        # if vrm_bone.bone_name: # ⭐️
        #     bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name)) # ⭐️

        #  =============== replace start👌
        metarig_bone_attr = getattr(metarig_human_bones, bone_type, None)
        vrm_bone_attr = getattr(vrm_human_bones, bone_type, None)
        if (
            hasattr(metarig_bone_attr, "node") and
            hasattr(vrm_bone_attr, "node")
        ):
            metarig_bone = metarig_bone_attr.node
            vrm_bone = vrm_bone_attr.node
            if hasattr(vrm_bone, "bone_name") and vrm_bone.bone_name:
                bone_mapping.append((metarig_bone.bone_name, vrm_bone.bone_name))
        #  =============== replace end👌
                
    return bone_mapping

This alongside rblz's tweaks to the code fixes the plugin for me. Now it works, I'd suggest finding a way of opening up a pull request if possible.

[ElAbuelo2]

Almost. But the addon assumes that bones with hardcoded names like "DEF-f_pinky.03.R" will always be there. Depending on model scale, addon version, etc, such bone may not exists. Rather than rely on it, we should check if they are there.

This resulted for me in error like this:

  KeyError: 'bpy_prop_collection[key]: key "DEF-f_pinky.03.R" not found'

function rename_rig_bones_to_match_vrm_model_vertex_groups needs to be replaced for this version:

def rename_rig_bones_to_match_vrm_model_vertex_groups(rig_object: bpy.types.Object, bone_mapping):
    armature_rig: bpy.types.Armature = rig_object.data
    with ModeContext.editing(rig_object):
        for metarig_bone_name, vrm_bone_name in bone_mapping:
            if metarig_bone_name in ["eye.L", "eye.R"]:
                rig_bone_name = f"ORG-{metarig_bone_name}"
            else:
                rig_bone_name = f"DEF-{metarig_bone_name}"
            
            if rig_bone_name not in armature_rig.edit_bones:
                print(f"[vrm-rigify] WARNING: rig bone not found, skipping: {rig_bone_name}")
                continue
            
            rig_bone = armature_rig.edit_bones[rig_bone_name]
            rig_bone.use_deform = True
            
            print(
                f"renaming bone '{full_bone_path(rig_bone)}' to '{vrm_bone_name}'"
            )
            rig_bone.name = vrm_bone_name

Already packaged zip file, with all patches from this thread, uploaded as convenience.

vrm_rigify_nonchang-net_patch.zip