In this tutorial, we are building a fully functional, real-time minimap in Unreal Engine from scratch.
Instead of just slapping a camera on a character, we’ll follow engine best practices to ensure your map is clean, professional, and highly optimized. You’ll learn how to properly set up a Render Target 2D for UI, create a procedural circular material using Radial Gradient Exponential, and configure an Orthographic Scene Capture that won’t ruin your game’s performance.
https://dev.epicgames.com/community/learning/tutorials/qEKo/fortnite-how-to-create-an-optimized-minimap-in-unreal-engine