Black dots (noise) on Mesh after import from Blender

[vellip]

Hi, I’ve followed a youtube tutorial to do stylized grass. However after importing my mesh from Blender my grass blades have really weird black dots and noise on their faces. I’ve tried a few things and can’t get it to work really.

These tutorials I followed:

How to make Stylized Grass in Unreal Engine 4/Blender

How to Make Anime-Style Grass in Blender and Unreal Engine in 30 Seconds #shorts

Thanks a lot!

[vellip]

So, I found out that it disappears when I turn off “Cast Shadows” - I remember seeing that in the video. So technically it’s solved, but for future: Why is that happening?