How to use Metahuman Hair Material on custom groom?

Development Character & Animation
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Szenario:

  • Metahuman created in Metahuman Creator
  • Exported to Maya
  • Custom groom created in maya
  • Groom exported to alembic and imported into UE5 according to documentation

Now I want to create a nice base color, some Ombre and maybe some highlights.

The default Metahuman hair material (M_hair_v4) allows all of that. It is the material that is being used when you create a hairstyle in the creator and export it to UE5.

However, it does not seem to work with custom grooms.
Most changes to the material instance result in no change at all for hair color and style.
The only thing that is working is the “dye”-section, where all hairs are dyed a single color.

Is there some trick to get the material to work with custom grooms?
Or is the best way forward to work with the old “HairDefaultMaterial” and create my own material from scratch?

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I have encountered the same problem. Have you resolved it？

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Have never been able to resolve it.
Instead, I started creating my own hair material and developed my own functions for Ombre / Highlights.
They are not as good as the one’s used in the Metahuman Hair Material, but good enough.

My best guess is that it does not work due to some inconsistencies with Root UVs, Guide Ids and seed.

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