UE5.5 Mutable Skin BUG

[zhangruizi (章瑞兹)]

I have found that with mutable-generated skeletal mesh, it will have strange deformations, such as vertex weights that have been incorrectly calculated

[zhangruizi (章瑞兹)]

@GerardMTE Please check, thank you!

[gustavorios2 (Gustavo Rios)]

I have the same issue.
it’s broken.
I just reported a bug, still waiting for a response

[GerardMTE (Gerard Martin)]

Mutable currently does not automatically detect if a SKM has more than 8 bone influences per vertex. Probably what is happening here is that your SKM has 12 influences and those larger than 8 get remapped to other bones.

You can manually change this setting in Engine\Plugins\Mutable\Config\DefaultMutable.ini. Uncomment ;CustomizableObjectNumBoneInfluences=Eight and set it to Twelve.

[gustavorios2 (Gustavo Rios)]

Oh my God… I searched for that setting within Unreal Engine but never thought to check the config files . I’ll take a look. Thanks!

[zhangruizi (章瑞兹)]

Did you solve it?

[zhangruizi (章瑞兹)]

Still the same, nothing seems to have changed

You can use the meta human head for testing, it must play an animation

[zhangruizi (章瑞兹)]

@zhangruizi

Did you solve it?

Did you solve it?

[gustavorios2 (Gustavo Rios)]

Sorry for the delay in responding. My issue was indeed the bone limit per vertex. The solution suggested by @GerardMTE completely fixed the problem.

[ehgus5865]

This doesn’t fix the issue either. When regenerated as mutable, the skeletal mesh skin values change. However, when using the same mesh in the mutable sample project, there are no issues.