mutable - enable anim bp physics assets manipulation (Kawaii Physics)

Hello,

We are currently researching how well Mutable can be integrated into our game as a new character customization system.

In our game, many of the outfits include long garments with various physics behaviors, mainly using Clothing simulation and Kawaii Physics through AnimBPs.

While testing the Mutable plugin in Unreal Engine 5.6, we confirmed that the checkbox for “Enable Clothing” in the compilation options works correctly.

However, when enabling “Enable Anim BP Physics Assets Manipulation”, we expected that the Kawaii Physics components (post-process AnimBP) attached to each outfit part would be included and function properly in the generated Mutable instances.
But even with the checkbox turned ON, Kawaii Physics does not seem to work on the Mutable-generated instances.

So I would like to ask:

  • Is this feature still under development because Mutable is currently in Beta?

  • Is Kawaii Physics not supported by Mutable?

  • Or am I missing something in the setup or testing process?

Additionally, here are the specifications of the setup I am currently testing:

  1. The base body Skeletal Mesh and all clothing Skeletal Meshes use the same Skeleton.

  2. On the base body, only the primary body bones are enabled, and the secondary bones (used for outfit physics) are not enabled.

    • Do all secondary bones used by every outfit need to be included in the base body skeleton for Mutable to support physics correctly?
  3. For the base body’s Customizable Object, I only enabled the following compilation options:

    • Enable Clothing

    • Enable Anim BP Physics Assets Manipulation
      Should I also enable any other options for this to work?

  4. Just in case, I tested the same setup not only in Unreal Engine 5.6, but also in 5.7, and in both versions, Clothing simulation works, but AnimBP-based physics (Kawaii Physics) still does not work in Mutable instances.

Thank you.