Technology
How Arcwright works.
Arcwright is a game engine and editor built from day one for AI. This is the whole system: how your AI builds inside it, how the Forge makes real 3D from a picture, how the materials, the light, the bodies and the worlds work, how a bot proves the game works, and how it all runs everywhere. Every section goes into detail.
123456- 1Sky and clouds: a physical sky with real clouds, the sun setting behind them.
- 2Terrain kilometres across, mountains and all.
- 3Trees grown by rules.
- 4Grass and flowers grown around the camera, wherever you go.
- 5Rowan: made from Nano Banana sheets by the Forge, rigged and ready to walk.
- 6Light from behind: the meadow glows where the low sun hits it.
The system
How the pieces fit together.
You
Describe the game, drop in pictures, or build by hand.
The Arcwright editor · 315 tools
Every tool the AI uses is a tool you can use: place, forge, paint, light, script, play, test. Every step shows on screen and lands in History.
How it works →Proof and performance
A bot plays it through the real controls and reports what broke; the Frame Doctor finds what's slow.
How it works →In detail
Every system, explained.
Building with AI
Your AI works inside the editor with 315 tools, live on screen.
How it works →
Nano Banana + the Forge
Every model starts with a picture. Here's every way we use it.
How it works →
How the Forge works
Real 3D from a recipe, in 12 stages you can watch.
How it works →
Material Maker
Surfaces from real photos, tested under four lights.
How it works →
Light and rendering
Bounced light, reflections, glass, rain and haze.
How it works →
Bodies
Skeletons, balance, hitboxes, clothes and hands.
How it works →
Sequencer and Pose & Grip
Direct cutscenes on a timeline.
How it works →
Terrain, rock and caves
Cliffs and caves carved with brushes.
How it works →
Worlds, water and space
From a meadow to the moon.
How it works →
Proof and performance
A bot plays it, and the engine finds what's slow.
How it works →
Runs everywhere
Mac, Windows, Linux, Steam Deck and the browser.
How it works →Day 1 → today
From the first commit to today.
Arcwright is built in public, every day, by Gordon with Claude Opus 5.5. The moments that mattered, oldest first. Scroll sideways.
- Day 1
The first commit
5:27 am. Before 8 am, an AI agent had built a stealth level live in the editor.
Three games, three wins
Castaway, Circuit and Harbor Run built. The test bot wins all three.
- Day 3
On a Steam Deck
The bot's finish time on the Deck matches the Mac to the hundredth of a second.
It gets a name
728 tests, 0 failures. Named it Arcwright. An early Forge car.
A whole house
The structure, the furniture, the bathroom and the roof, all made in the engine.
Rain and glass
Wet streets at night, reflections, a working Fresnel lens and sculpted canyon walls.
To the moon
A launch from the pad to 112 km, then the moon from orbit.
A finished game
Lanternfall: four levels, two shrines and a boss, exported as its own Mac app.
The Zombie Woods
About 490 trees, photo-based bark with moss and light shafts between the trunks.
Bodies that react
Zombies that fight to keep their balance, catch themselves and get back up.
Ashgrove
A haunted-mansion zombie map: boarded windows they tear open one board at a time.
Reloads by hand
Magazines out and in, a slide that locks open, and the soldier in full gear.
Beta 1 is out
Windows, Mac, Linux and Steam Deck, five sample games and the Vulkan renderer.
The Forge, in your browser
Make 3D models free in the browser, Windows and Linux 0.3.1, and 3D browser games get sound, fog and light beams.
The full story is in the build log, and what's next is on what we're working on.
See it for yourself.
Download Arcwright free and open any of our games to see these systems at work.
Start building today.
Arcwright is free. Download it, describe your game, and watch Claude Opus 5.5 build it in front of you.
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