Did you figure out which lighting and/or engine scalability settings will fix the issue? Because I really want to use this hairstyle and I'm not having any luck tweaking things. I did take a look at the opacity maps in Photoshop. The Eyelashes (which look fine in both the viewport and renders) = 4096 x 4096; the Hair = 2048 x 2048; the Brows = 1024 x 1024  

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I was not able to figure it out at all. I moved on to using Groom assets; initially created in Blender and then exported as Alembic files and imported into UE5. 

I may try again in the future with another character, but I couldn't figure out how to make it work in UE5. 

Here's what I found:

https://www.youtube.com/watch?v=6AiUrL9Pa0s

Interestingly, I've actually seen that video, but it doesn't address the issue with hair cards, which is what the CC4/iC8 hair is. Using a groom asset, I don't experience the same issues.

Yeah , I am having the same issue with smart hair :

75% of original size (was 670x19) - Click to enlarge

75% of original size (was 670x19) - Click to enlarge

Yet RL continues to advertise, market and hyper push their software in an Unreal Engine pipeline.
After 15 years of this BS I can say that I've had enough!

And you’re an expert user. That is truly puzzling. I thought maybe it was just some setting that I couldn’t find, some tick box, but since you are also experiencing it then that honestly makes me feel better.

It's 2024 and I'm still having this problem! Has anyone found a fix? In these two examples, I both rendered the scene and took a High Resolution screenshot... the screenshot came out much better than the render
75% of original size (was 670x19) - Click to enlarge
75% of original size (was 670x19) - Click to enlarge