Universal Fighting Engine 2 (PRO)

Overview of Fighting Game Architecture

Universal Fighting Engine 2 (PRO), also known as UFE 2, is a development framework designed for creating a wide array of fighting game styles, including 2D, 2.5D, and 3D projects. The framework is built around a collection of templates and visual editors that allow developers to construct mechanics without starting from scratch. One of the primary advancements in this version is the inclusion of native rollback netcode paired with deterministic physics, which aims to provide a more stable environment for online play. The toolkit is cross-platform and includes support for mobile development, making it adaptable to various hardware targets.

Networking and Deterministic Physics

The engine offers two primary methods for handling network synchronization: Frame Delay and Rollback. The rollback netcode implementation is designed to handle latency by predicting inputs and correcting states, a standard requirement for modern competitive fighting games. This system relies on the engine's deterministic physics engine to ensure that game states remain consistent across different clients. For developers looking to integrate third-party networking solutions, the framework supports Photon Unity Network 2 and Mirror Networking, as well as specialized Bluetooth networking for mobile platforms including Android, iOS, and tvOS.

Visual Editors and Hitbox Management

A central component of the framework is its suite of user-friendly editors. This includes a custom hitbox editor designed specifically for 2D animations, allowing for precise control over strike and hurt boxes. The system supports both Mecanim and Legacy animation styles, ensuring compatibility with various character rigs. Developers can also utilize the custom input manager to define how the game interprets player commands. The package is bundled with 6 pre-configured characters and over 180 animations to serve as a baseline for new projects. Additionally, the engine supports full resource loading for assets, streamlining how content is managed within the Unity environment.

Gameplay Mechanics and AI Systems

UFE 2 expands beyond traditional 2D combat by introducing modes specifically for 3D gameplay. The framework includes several built-in systems common to the genre:

• Combo and Grappling Systems: Dedicated logic for stringing attacks together and managing throw mechanics.
• Character Assist and Multi-gauge: Support for tag-team style mechanics and complex energy bar management.
• Story and Challenge Modes: Structured single-player content templates for narrative progression or skill-based trials.
• Cinematic Options: Tools for managing camera movements and dramatic sequences during gameplay.

For single-player experiences, the engine provides advanced A.I. support. This includes Random AI for unpredictable behavior and Fuzzy AI for more nuanced, logic-based opponent reactions. Developers can also utilize replay tools to allow players to review their matches.

Customization and Extensibility

The framework is designed to be modified. It features open-source GUI scripts that are compatible with the standard Unity GUI system, allowing for complete UI overhauls. For programmers, the engine offers extended coding support to build upon the core framework. It also integrates with several third-party addons for input and control management, such as Control Freak, cInput, and Rewired. This flexibility ensures that the engine can be tailored to specific project requirements, whether the goal is a mobile-friendly arcade title or a complex 3D arena fighter.

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