Vellum hair flickering shadows with Polywire

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Hi All!

I am creating grass using Vellum Hair via this tutorial: https://www.youtube.com/watch?v=QlX7_okxOJA [www.youtube.com]
The shadows on the grass texture flicker. I noticed he doesn't have the flickering shadows like I do.

I have the grass tapering using a uv texture with rows and columns post-sim and then a wrangle with:

f@u = v@uv.x;
f@width = chramp("remap", f@u) * ch("size");

This wrangle controls the grass taper.

Not sure if I can do some vellum post process or if I have to re-sim with the polywire before the vellum solver instead of after, or if its a normals issue, or using the uv texture post-sim, or what.

Attached is a video of the problem, a screenshot of the nodes, and a .hiplc file. If possible to reply with a .hiplc file as well would be much appreciated.

Thanks!

Attachments:
Screenshot 2025-08-28 at 10.36.16AM.png (510.0 KB)
Vellum_Grass_title_v2.hiplc (3.3 MB)
grass flicker problem_2.mp4 (12.1 MB)

-Dan Huiting
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