A quick Ornatrix to Unreal Engine 5 workflow showing how to paint hair and fur colors and export the groom with the correct "groom_Color" channel.
This channel name is important because Unreal Engine uses it to read painted groom color data properly in the UE hair shader.
In this tutorial, I cover Paint Tool setup, custom grooming channels, texture projection, Ornatrix Alembic export, and the Unreal Engine Export option for UE5.