The map is really designed to be viewed from one angle, and I'm assuming the modeled out a bunch of individual assets, UV'd them, laid them out in the map, then used some sort of semi automated process to split the models into square chunks for streaming, used a tool to repack the UVs and make sure the texture resolution…
Wow those LoL UVs look funky. Because i know they know how to straighten and do it. But maybe that standard was dropped eventually. The LoL texture up there looks really wasteful and one could probably get a lot more texel density by straightening and packing it better. There are many perks to straightening UVs in your…