VRM-Addon-for-Blender
                                
                                
                                
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                        Some questions:
Hello, can I use the add on for a already rigged model ( done with auto rig)..
Do I have to create shape keys for mouth shapes ch o and so on?
Hello, can I use the add on for a already rigged model ( done with auto rig)..
Yes
Parent-child relationships of bones must follow the VRM Humanoid definition. https://vrm.dev/en/univrm/humanoid/humanoid_overview.html#id3
Do I have to create shape keys for mouth shapes ch o and so on?
Yes.
Please assign the shape key to VRM BlendShape Proxy.