Simple Inventory System - Unreal Engine 5 Multiplayer (2024)

learn to create a widget blueprint for the main UI in Unreal Engine 5, using a canvas, buttons, images, and text, with designer and graph workflows.

Design the main UI in Unreal Engine 5 multiplayer by building a simple inventory button with a backpack icon using a widget blueprint, canvas panel, overlay, alignment, and anchors.

Designs the inventory category button as a reusable widget blueprint, using a canvas, overlay, button, and centered image to support dynamic category icons such as food, consumables, and weapons.

Design and implement inventory slots in Unreal Engine 5 by building a user widget with canvases, overlays, and images, styling with padding, outlines, and shadows.

Design the inventory UI with a horizontal box for categories and inventory, a vertical box for categories, and a grid panel for slots, using padding and alignment for dynamic overlay.

Display the main UI in a multiplayer Unreal Engine 5 game by creating the inventory widget, adding it to the viewport, and running UI logic on the client.

See how the server enforces authority in Unreal Engine multiplayer by validating client actions to prevent cheating, while user interface and widgets run on the client.

Bind the I or B key to open the inventory using Unreal Engine 5's input mapping context and input action, ensuring the trigger fires once.

Create a game widgets enumeration in Unreal Engine blueprints to represent UI elements as a list. Use enumerations to organize items like inventory, main UI, and crafting menus for display.

Create a client-run open close widgets event in the player controller to toggle the inventory UI, using the game widgets enumeration and creating, adding to viewport, or removing from parent.

Explore blueprint communication by retrieving and casting to the player controller to open the inventory widget, then consider blueprint interfaces to avoid slow hard references.

Explore blueprint interfaces in Unreal Engine 5 to reference the player controller without casting, call open and close inventory widgets, and safely access controller variables using self.

Toggle inventory in Unreal Engine 5 using a boolean inventory is open in the player controller; open or close the inventory widget with blueprint logic and i or b keys.

Create a base item blueprint as a reusable actor, add a static mesh and a collision sphere, enable overlap events for player interaction, and enable replication for multiplayer clients.

Create child blueprints from a base item blueprint to inherit components like static mesh and collision sphere, and shared settings via class defaults, easing edits across many items.

Create item blueprints from the item base, assign static meshes for banana and other items, and define an item name string with localization via the localization dashboard.

Define and use an item info structure in Unreal Engine via blueprints to organize inventory data, including name, thumbnail, category, and coin value, and apply it to the item base.

Define the item info structure with name, thumbnail, description, category enum, item class reference, consumable and stackable flags, and max stack size; explore storing it via a data table.

Create a data table in Unreal Engine blueprints using the item info structure to store per-item data like name, thumbnail, description, category, and class.

Learn to build an item data table in Unreal Engine using Google Sheets, map items via id, name, thumbnail, and description, then export as CSV for designer-friendly imports.

Learn to build a blueprint function library to expose get item info, fetch data table rows, and normalize item names for global access across blueprints.

Create an actor inventory component in Unreal Engine 5, name it AC inventory, place it in a components folder, and add it to the player blueprint.

Define the inventory slot structure in Unreal Engine 5 multiplayer by storing the item info, quantity, the associated UI widget, and a slot index for each slot.

Create an inventory category structure in Unreal Engine 5 multiplayer with a category enum and icons, plus a data table and library function to fetch category info for blueprints.

Create inventory variables and arrays for categories in Unreal Engine 5 multiplayer. Define 16 slots, selected category, and per-category inventory slots (weapons, food, potions) for dynamic gameplay.

Resize the inventory arrays to the number of slots in Unreal Engine 5 and initialize the inventory on the client, using begin play to verify the 16-slot setup.

Create and display inventory category widgets by iterating data table row names, constructing widgets with category icons, and adding them to the categories vertical box on the client.

Create and render inventory slots by spawning 16 slot widgets in a 4x4 grid, updating the grid when items change, and managing slot indices and visibility.

Wire a client-run custom event in the inventory component to set the clicked category as the selected inventory category and redraw the inventory slot widgets.

Add existing items to the inventory by syncing category arrays (weapons, foods, potions) and re-drawing slot widgets based on the selected category.

Update the inventory slot user interface when looting by setting the item thumbnail, updating the quantity text, and toggling visibility based on quantity.

Set up a loot input action with the E key, and run loot logic on the server to prevent cheating by checking overlapping items and returning results to the client.

Add the initial add-to-inventory logic in Unreal Engine 5 by wiring a client-side event to transfer the looted item from the item base to the player's inventory.

Implement a robust add item to inventory function that processes item info, quantity, and slot details, supports stackable and non-stackable items, and updates the category user interface in real time.

Create item stacks in unreal engine 5 multiplayer inventory by handling max stack size, determining stackable items, finding empty slots, and replicating loot across server and clients.

Create a macro to find partial stacks in the inventory by matching item names and under-max quantities, then add to existing stacks or create new ones.

Fix a bug in the Unreal Engine 5 multiplayer inventory where counts misdisplay when the inventory isn't opened. Precreate widgets for categories and display them on demand to optimize performance.

Implement drag and drop from the inventory in Unreal Engine 5 multiplayer, detecting drags with mouse events and using a drag operation with the item image as the visual.

Enable physics for items by setting simulate physics and enabling collision in item blueprints. Fix collision by adding a box simplified collision and adjusting its size to prevent ground penetration.

Retrieve and update inventory slot information by retrieving the dragged and new slot indices, wiring them through the player controller and inventory widget to enable drag and drop between slots.

Implement update drag slot and update new slot functions to modify the dragged item and quantity in inventory, and refresh the inventory slot UI accordingly within Unreal Engine 5 multiplayer.

Learn to drop items onto inventory slots in Unreal Engine 5 multiplayer, handle stackable items on drop, and update inventory slots with a dedicated function.

Update the inventory slots by handling drag-and-drop between slots. Swap non-stackable items and stack quantities for stackable items within max stack size.

Add sound effects to the simple inventory system in Unreal Engine 5 multiplayer by creating sound cues, adjusting volume and pitch, and triggering open, close, drop, and loot actions.

Test the final product to verify the inventory system works across server and clients, including looting, stacking limits, dropping, and cross-client synchronization on a dedicated server.