Building System in UE5

Devlog

• Day 13 - User Interface
  April 15, 2026 by svemii

  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... Continue reading
• Day 12 - Door Functionality
  April 15, 2026 by svemii

  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... Continue reading
• Day 11 - Finishing Build
  April 15, 2026 by svemii

  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... Continue reading
• Day 10 - Moving Build To World
  April 15, 2026 by svemii

  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... Continue reading
• Day 9 - Doors and Brick Blocks
  April 14, 2026 by svemii

  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... Continue reading
• Day 8 - Windows
  April 14, 2026 by svemii

  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... Continue reading
• Day 7 - Removing Pieces
  April 14, 2026 by svemii

  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... Continue reading
• Day 6 - Stairs
  April 14, 2026 by svemii

  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... Continue reading
• Day 5 - Walls
  April 14, 2026 by svemii

  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... Continue reading
• Day 4 - Building Floors
  April 14, 2026 by svemii

  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... Continue reading
• Day 3 - Build Preview
  April 14, 2026 by svemii

  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... Continue reading
• Day 2 - Camera Controls
  April 14, 2026 by svemii

  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... Continue reading
• Day 1 - Setup
  April 14, 2026 by svemii

  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,... Continue reading