Building System in UE5 Devlog - itch.io

Day 13 - User Interface

Wed, 15 Apr 2026 01:41:25 GMT

An UI is created for the building system by rendering 3D buildable items into a 2D interface. A preview actor is set up with arranged static mesh instances, which are captured using a Scene Capture Co...

Day 12 - Door Functionality

Wed, 15 Apr 2026 01:41:03 GMT

A functional door system is done by introducing a custom structure to track each door’s state, including whether it’s open and its rotation values. A door positions array stores this data, with do...

Day 11 - Finishing Build

Wed, 15 Apr 2026 01:40:41 GMT

To wrap up the building system, we’re finalising how preview and completed build pieces are handled using a structured approach that links instanced mesh components. It introduces logic to prevent p...

Day 10 - Moving Build To World

Wed, 15 Apr 2026 01:40:20 GMT

To transition a structure from preview mode into the actual game world, it begins by setting up a custom “Prepare Build” event that loops through all mesh components, updating their materials to a...

Day 9 - Doors and Brick Blocks

Tue, 14 Apr 2026 01:39:29 GMT

To expand the building system, functional doors and new brick structures are added. It begins by setting up separate instanced mesh components for preview and final doors, allowing smoother real-time...

Day 8 - Windows

Tue, 14 Apr 2026 01:38:56 GMT

A dynamic window system to a UE4 building setup, starting with a Build Window Preview function that reuses existing grid-based placement logic and checks wall rotation to determine whether to build al...

Day 7 - Removing Pieces

Tue, 14 Apr 2026 01:38:28 GMT

A demolition system for a UE4 building mechanic by introducing a toggleable demolition mode using the X key, which switches between building and destroying states while providing visual feedback by ch...

Day 6 - Stairs

Tue, 14 Apr 2026 01:38:06 GMT

Stairs are added to the building system by introducing a rotation mechanic that allows stairs to face all four directions. A key input (R key) cycles through rotation states stored in a variable, whic...

Day 5 - Walls

Tue, 14 Apr 2026 01:37:44 GMT

There was an alignment issues that occur with simple rotation in building a flexible wall system. To solve this, a 3-way rotation system is implemented using a boolean toggle and position offsets, all...

Day 4 - Building Floors

Tue, 14 Apr 2026 01:37:22 GMT

Floor-building system is done by first ensuring materials support instancing, then setting up a Build Preview Actor using an Instanced Static Mesh Component for efficient replication. A custom event i...

Day 3 - Build Preview

Tue, 14 Apr 2026 01:36:57 GMT

A dynamic preview system is made for placing structures. It starts by setting up a custom trace channel and key variables to track two build locations and whether the first point has been placed. An i...

Day 2 - Camera Controls

Tue, 14 Apr 2026 01:36:38 GMT

A smooth camera movement system is built for a construction mode by adding keyboard controls (W, A, S, D, Shift, Space) that move the camera relative to its forward and right vectors. A custom “Step...

Day 1 - Setup

Tue, 14 Apr 2026 01:36:15 GMT

First created UI-based build menu toggled with the B key. A construction mode boolean is used to control whether the player enters build mode, where a widget is displayed, the mouse cursor is enabled,...