I have very little experience unwrapping UVs. I'm not able to wrap my head around how to seamlessly create the texture for a beveled rectangle.
Here was my attempt when UV unwrapping it. I ended up with large, ugly seams.
In Rocket League they not have seams, but their texture was not a simply repeating hexagonal pattern like mine was. Theirs was filled with irregular sized hexagons, as well as pentagons in some places where the pattern needed to transition and curve.
I'd love any direction as to how you think the developers might have accomplished this seamless, custom UV texture.