Automatic Radial Menus is a UE4 plugin which can be used to generate a radial menu of any size. The plugin manages user interaction and events for use with either a mouse or gamepad. This plugin can be implemented with 100% blueprint code, however, it also can be used in C++ if desired.

Thanks to RPMonkey for help with the shader creation. https://www.unrealengine.com/marketplace/en-US/profile/RPMonkey

Documentation