Hi Calvin, thanks for the follow up message. I appreciate it.
I have continued to troubleshoot this and have some new information.
According to the UE5.2 roadmap (https://portal.productboard.com/epicgames/1-unreal-engine-public-roadmap/c/994-lumen) Lumen has better support for hair grooms. I was using 5.1 and struggled but starting with 5.2 things are MUCH better.
If you'd still like to reproduce, here's what you can do:
1) Create a new UE project. The "blank" template under "Film/TV" works well.
2) Ensure the project is outdoors, and uses a directional light and skylight.
3) drop a character into the scene. Note how the hair looks in the viewport.
4) Drop a camera into the scene and using the MRQ, render out a frame or two.
The issues are more with rendering than they are with the viewport.
But again, 5.2 is a big improvement over previous versions.
While hair in Lumen looks ok, the RL hair in the UE path tracer does not. Drop a CC character in the scene and compare to this free asset from the UE Marketplace: https://www.unrealengine.com/marketplace/en-US/product/paragon-lt-belica
I did an export of a character I've been testing with. It's just a stock Camila with a hair builder asset. I've attached a screenshot of the export settings I used. You can download her here: https://1drv.ms/u/s!AghB3gZdj1BVgvM0A79Jd_tvCNPr-w?e=c3k4U0
Please let me know if I can help in any way.
Thanks for your reply.
Cause we can't reproduce the issue, could you send your fbx file to us, so that we can check the issue properly.
You can upload it to cloud service such as Google drive, and attach the download link in your next comment.
Thanks for your help!