MP Inventory System – Unreal Engine
MP_Inventory provides a robust, production-ready framework for managing items in multiplayer Unreal Engine projects. Instead of relying on standard array replication (which can quickly overwhelm a server when players hoard items), this plugin utilizes native delta serialization.
This means only the specific item that changed is transmitted, ensuring stable performance regardless of how full a player’s backpack becomes.
The architecture revolves around flexible Actor Components. By attaching the core inventory and manager components to your existing classes, you can instantly grant inventory capabilities to players, vehicles, or storage containers with minimal setup.
Key Advantages:
Optimized Networking: Built natively on FFastArraySerializer. Changes to item quantities or positions are sent as tiny network packets rather than replicating the entire inventory array.
Versatile Design: Supports multiple inventory styles out of the box. Enable “Strict Slots” for fixed grid-based inventories (e.g., survival horror), or disable it for continuous scrolling lists (e.g., fantasy RPGs).
Secure Transactions: Every operation (from splitting stacks to moving items between a chest and a backpack) is handled through secure Server RPCs. Weight limits, stack caps, and container access rights are validated exclusively on the server.
Area Loot Mechanics: Includes a highly efficient tracking system for dropped items in the world, allowing players to instantly detect and loot nearby items without complex array index management.
UI Independence: The backend logic is entirely isolated from the frontend. Listen to the provided broadcast delegates to update your custom UMG widgets instantly when an item is added, moved, or dropped.
Data Persistence: Features a straightforward boolean toggle to automatically serialize and save inventory contents across gameplay sessions.
Features:
Fully Server-Authoritative logic to eliminate item duplication and client hacks
Delta-based Network Replication using Unreal’s FFastArraySerializer for maximum bandwidth efficiency
Flexible Slot System supporting both rigid Grid arrays and dynamic Infinite scrolling lists
High-performance Proximity Loot tracking for seamless world item pickup
Secure Ownership Validation (Global, Private, Whitelisted Access)
Multi-Container Swapping API for transferring items between players, chests, and drops
Integrated Encumbrance System for weight management
Built-in SaveGame Serialization for persistent inventory states
Completely decoupled UI data objects for custom frontend development
Code Modules:
MP_Inventory [Runtime]
Network Replicated: Yes
Important/Additional Notes:
Designed explicitly for multiplayer stability. The backend avoids sending entire inventory states over the network, drastically reducing data spikes during intense gameplay.
Includes functional UMG templates as a starting point. Developers are encouraged to build custom interfaces utilizing the provided C++ delegate hooks.
Demonstration environment assets seen in promotional materials are may not include.
Unreal Engine versions: 5.0 – 5.8
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