Froströk - Internship

During my internship at Froströk, I developed a fully replicated inventory and item generation system for multiplayer, and implemented core gameplay features using the Gameplay Ability System (GAS).

Internship Info

Role: Gameplay & Systems Programmer

Time Frame: 19/05 - 24/12

Engine: Unreal Engine

Inventory System

Spatial Inventory

I built a fully replicated spatial inventory system in C++ for multiplayer.
The system includes:

A 2D grid of inventory slots.
Items with their own width and height, allowing them to cover multiple slots.
Space management where players arrange items within the grid.
Item tracking based on a top-left slot index for easy placement and collision checks.
Automatic calculation of how much space each item occupies using top-left index.
Support for equipping items such as weapons and armor.

Items

Each item can be extended with an attribute called a fragment.
This system:

Uses Unreal’s instanced struct framework for efficient performance and memory usage.
Allows items to be expanded without modifying their core structure.
Stores data such as:
- Icon
- Item name
- Equipment properties
- Weapon information

Fragments make it easy to customize and build on item functionality.

This system is similar to Path of Exile

Example of fragments

Combat System

Gameplay Ability System (GAS) – Combat Refactor (C++ & Blueprints)

I was responsible for replacing an existing Blueprint-based combat system with a fully GAS-driven solution using C++ and Gameplay Abilities.

Rebuilt the core combat system using Gameplay Abilities, Gameplay Effects, and Gameplay Attributes, replacing the previous Blueprint-only implementation.

Implemented the gameplay flow so that all player actions (attacks, dodges, and special abilities) are triggered and managed through Gameplay Abilities.

Used Gameplay Effects to handle all stat-driven interactions, such as damage, attribute modifications, and temporary buffs/debuffs for both players and enemies.

Implemented a combo-based attack system where:
- A Gameplay Ability activates the attack, plays the correct animation montage, and communicates with a dedicated Combat Component.
- The Combat Component tracks the current combo index, which defines per-hit data such as damage, stamina cost, and other parameters.

Set up a data-driven animation system:
- Animations for each combo step are stored in data assets and looked up using gameplay tags.
- Each weapon has its own data table of available montages, making it easy to add or tweak weapons without changing code.

Ability system flow

Example of combo data