GPT 6 Astra Built an Interactive 3D Apartment! (Higgsfield + Godot)

What it does

This is a 3D apartment you can actually walk through, not just a render. You move around in first person, switch to a character view, sit on the sofa to check sightlines to the TV, and open doors. The floor plan drives everything: change furniture in 2D, then jump back inside to feel the space.

The most useful tool is the model ruler. You measure between any two points in the room. That answers real questions like "will a wider sofa make the walkway too tight?" without driving back to the apartment with a tape measure.

Built with four pieces

Here's the stack, and it's not one magic prompt:

1. GPT-6 Astra - does the project development. It connects to Higgsfield through an MCP server, so the agent can request images and video while you talk to it. 2. Godot - runs the interactive apartment: movement, furniture changes, controls. 3. Blender - prepares materials and character assets. For example, linen wallpaper is built with color, roughness, and surface detail baked into texture maps the app reuses. 4. Higgsfield - generates the images and video treatments based on your scene.

What's interesting: Blender and Godot speak to each other through exported files, not some AI magic. You model the material, bake it, and the interactive scene displays it. Astra just coordinates the workflow.

What works and what's still missing

The current prototype has three default layouts, one of which is a Japandi style with IKEA product data. That means furniture dimensions are real, so you're planning around things you could actually buy. The creator says 80% of his own furnishings are IKEA, so it's a practical catalog for him.

You can invite other people into the same apartment in Together Mode. It's aimed at couples or roommates who argue about furniture placement. You leave wall notes, like comments on a Google Doc, or move the sofa while the other person watches from across the room. There are even NPCs you can add to see how crowded the space gets when friends are over.

But it's still a prototype. There's no photo-upload yet. You can't walk through a real apartment, take pictures, and have the app build the model with accurate dimensions. That's the next feature the creator wants to build, and it would make the whole thing far more useful for real planning.

The practical take

The payoff isn't a finished apartment generator. It's a working feedback loop: you make a decision in the interactive space, then use Astra and Higgsfield to generate images or video that show the same decision from a cinematic angle. You compare the generated result beside the interactive one. Did the mood survive? Did the layout look the way you expected? That comparison tells you if the workflow worked.

If you want to try Astra with Higgsfield, start with a scene you already understand. Show the agent what matters, keep the original beside the result, and don't expect it to replace an interior designer. Expect it to replace the trip back to the apartment with a laser measure. That's worth the setup time.