I've found an issue with the file, on the interpolation node modifier you do not have the UV Map attribute set. You need to set it to the UV map's name, in this case, "UVMap UDIM"
This does…
I'm still somewhat new to UDIMS and might be misunderstanding, but as far as I can tell the UVs are contained within the first UDIM tile, and the only references to UDIMs that I can find is in the…
I spoke too soon... I've added the Hair Curves Noise asset to the new hair, and the problem is back - except now it's more of a slower wavy effect - or faster if the Scale value is smaller, which…
Likely the same cause as #107856 ?
That was @SimonThommes 's inclination, however since the issue persists when the subsurface modifier is applied, he [suggested](https://projects.blender.org/…
I'm a bit confused by this point, that might be another bug. Maybe this part is indeed related to #107856 Could you confirm whether this issue persists when the subdiv modifier is applied? And…
Fair enough, in that case perhaps I'll revisit the hair system once it's animation ready. If it's of any benefit in the meantime, I'll address your suggestions and summarise my experience with…
Furthermore, I've found that moving the Surface Deform modifier after the Interpolate Hair Curves modifier on the vellus hair (which is attached directly to the main body object) throws an…
Ok I've managed to reproduce it in the original file with Surface Deform at the bottom of the stack, by reconfiguring it as follows:
- The original plane object has been subdivided, and a new…
Unfortunately this doesn't resolve the issue in my main project; moving Surface Deform to the bottom of the modifier stack only makes a mess of the interpolated hair positions (see .gifs). I'm…