Server-Side Fog of War - Defending Against Wall Hacks

Learn how to implement a server-side "Fog of War" system to prevent wall hacks and ensure fair multiplayer gaming experiences in this conference talk from Unreal Fest Stockholm 2025. Discover CCP Games' innovative approach to anti-cheat technology that stops exploits at their source by ensuring game clients only receive data that players should legitimately have access to - eliminating the possibility of seeing through walls or gaining unfair advantages. Explore the technical problem of wall hacks in multiplayer games and understand how CCP Games developed their solution specifically for EVE Vanguard. Examine the integration process of this anti-cheat system with Unreal Engine's replication graph, including implementation details and practical considerations for multiplayer game development. Gain insights into server-side data filtering techniques that maintain game integrity while preserving performance, and understand how line-of-sight validation can be used to create more secure multiplayer environments for competitive gaming.