Thrixel for Unreal Engine

Build Unreal games with your coding agent

Describe a game in one prompt. The coding agent builds the Unreal level and gameplay, with Thrixel generating the 3D models it needs.

Install 
Install the build-world skill from https://github.com/thrixel/build-world and follow the setup instructions in that repo.
Build World on GitHub →
Build World gameplay demo.

Why Use Thrixel

Without Thrixel

  • Prototype levels often start with cubes, capsules, and placeholder props.
  • Writing geometry by hand spends tokens that would otherwise go to gameplay.
  • Finding matching assets and adapting them to the level becomes a separate task.

With Thrixel

  • Models are generated from text or reference images to fit the game's art direction.
  • Assets generate in parallel while the agent builds the level.
  • Individual parts can be edited, grouped, and prepared for use in Unreal.

Unreal Engine Support

  • FBX import

    Generated assets are downloaded as FBX and imported into organized folders in the Unreal project.

  • Moving parts

    Doors, wheels, and lids can stay separate meshes, with pivots and movement configured in Unreal.

  • Materials and textures

    Material slots survive grouping. The agent checks texture assignments and surface appearance after import.

  • Blueprint gameplay

    Unreal MCP lets the agent build Blueprint logic and connect gameplay to actors in the level.

  • Scene inspection

    The agent checks each asset's scale, facing, and placement against the surrounding level.

  • Playtesting

    Play-In-Editor checks and screenshots help identify camera, collision, and rendering issues.

How It Works

You

  • Add the skill and set up Unreal
  • Describe the game

Coding agent

  • Plans the game
  • Builds the level
  • Creates Blueprint gameplay
  • Playtests and fixes issues

Thrixel

  • Generates the models
  • Adds detail and textures
  • Prepares assets for import
  • Saves them to the Thrixel workspace

The result is an Unreal project with levels, gameplay, and generated assets.

Reuse and Refine the Assets

A shared Thrixel workspace

Models generated by the agent remain available in the Thrixel workspace. Edits made in the browser can be pulled back into the Unreal project. The same models can also be reused when rebuilding a Unity or Roblox game in Unreal.

Get Started

1 Add the Build World skill to a coding agent.

Install the build-world skill from https://github.com/thrixel/build-world and follow the setup instructions in that repo.

2 Describe the game and name Unreal as the engine.

/thrixel:build-world build an exploration game in Unreal Engine set in an overgrown observatory, with ancient telescopes, collectible star charts, and doors that open when puzzles are solved

Build World's Unreal workflow requires Unreal Engine 5.8 or later, a project, and the editor's MCP connection. The Unreal setup guide covers the required plugins and connection checks.

Claude Code and other coding agent setup instructions are in the Build World setup guide.

Read the guide: How to build an Unreal Engine game with AI.