Roblox AI in Blender: How We Built the Roblox Backrooms with 3D-Agent and Claude Opus 5.5

I'm not a Roblox dev. I've never modeled a Backrooms level by hand, and I've never rigged a Roblox character without watching three tutorials first.

But over the last few weeks we made a whole Roblox Backrooms series, four episodes, and nobody on our team pushed a single vertex. Every room, light, character and animation was built in Blender by prompting 3D-Agent. This is how Roblox AI actually looks when it works inside a real 3D tool, and I want to show you exactly what it did.

Here's the full story so far:

First, what is 3D-Agent?

Quick context so the rest makes sense. 3D-Agent is a desktop app for macOS and Windows that works on your open scene in Blender 4.2 or later. You describe what you want, and it builds it step by step with Blender's own tools, so everything you get is normal, editable Blender geometry.

It has its own agent (it's not a Blender MCP server), it installs its own Blender extension, and there's no API key to set up. For this series it ran on Claude Opus 5.5 + GPT-6 Astra.

Roblox Backrooms, built in Blender with prompts

The idea: Noob, Bacon and Hazmat get trapped in Backrooms Level 0. The walls keep moving, an entity hunts them, and someone wrote 3D-AGENT.COM on the wall. Then they find the computer that's building the rooms.

The yellow corridors, the ceiling lights, the Roblox-style characters, the entity in the dark: all prompted. Later episodes go to the Poolrooms and to AI copies of the characters.

The part I like most: nothing is a baked video or a fake render. Every wall is still a real object in Blender. You can open the scene and keep editing it.

Roblox map maker: one screenshot, one prompt

This one surprised me. We gave 3D-Agent one screenshot of a Roblox map and one prompt. It rebuilt the whole thing in Blender: 13 cottages, seven watchtowers, a windmill and a bell tower. Real, editable geometry, not a generated shell.

If you've ever tried to recreate a map from a reference by hand, you know how long that takes.

Roblox Blender rigging in 3 prompts

Rigging is where I usually give up. Here it took three prompts:

1. Build the character as 15 separate body parts from one reference picture.
2. One bone per part, then a six-second walk cycle at 30 fps.
3. Light it, render it, and export an FBX for Roblox Studio.

No manual weight painting.

Roblox Studio AI: getting it into Studio

The classic route still works: export FBX or OBJ from Blender and bring it in with the Studio 3D Importer. We wrote a guide for that: Blender to Roblox.

The newer part: 3D-Agent can now connect to Roblox Studio directly. It can inspect your project, edit scripts, insert assets, run playtests and read the console. There's also a Roblox plugin that repairs scenes, attachments and rigs, and publishes through Open Cloud. More here: Roblox Studio AI with 3D-Agent.

What it's not good at (being honest)

It's not a one-shot "Roblox AI model generator" that spits out a finished asset from one sentence. It works like an artist you brief: step by step, and you steer it. It's great at maps, props, buildings and blocky characters. Photoreal faces and very organic sculpts are still better done by hand.

Episode 4 is out

The finale: Noob, Bacon and Hazmat find the server room where the Backrooms get built, turn to gray clay, and wake up trapped inside Blender. Someone keeps typing...

Want to try it?

• Download: 3d-agent.com (macOS and Windows, Blender 4.2+)
• Plans start at $19/month (Basic, 100 prompts). Pro is $29 and Ultra is $89.
• Come hang out on Discord. I'm there a lot.

So, what should we build next in the Backrooms? Drop it in the comments. The best idea goes into Episode 5.