A penthouse sales suite in Unreal Engine

The living room of an apartment that is not built yet, for buyers to walk through in a headset: low sun across an oak floor, a wall of glass onto a terrace, and a lever that changes day to evening.

A game picture from Unreal Engine: a living room in late afternoon sun with long shadows across an oak floor, two leather sofas and an armchair around a round table on a rug, a pendant lamp, a sideboard with vases, a sign that reads Residence 14B, and a wall of glass in dark frames onto a terrace with lounge chairs and planters under a blue sky
A capture of the game running on a flat screen, taken by the same check the agent uses. A game picture from Unreal Engine: a living room in late afternoon sun with long shadows across an oak floor, two leather sofas and an armchair around a round table on a rug, a pendant lamp, a sideboard with vases, a sign that reads Residence 14B, and a wall of glass in dark frames onto a terrace with lounge chairs and planters under a blue sky.

See its pageAn Unreal Engine project for headsets. Continuing from it needs Unreal Engine 5 on your computer.

The request, word for word

This is the text that was sent to the agent to start the project. Nothing was edited for this page.

We are selling the penthouse of our new development before it is built, and buyers will walk through it in a headset in our sales suite. Build its living room. The room is about 9 by 7 metres with a 3 metre ceiling. One long wall is glass, floor to ceiling in slim dark frames, onto a terrace with a parapet. It is late afternoon and the sun comes in low across the floor. Furnish it the way an interior designer would for the brochure: a sofa group around a coffee table, an armchair, a sideboard with a few objects on it, plants, a ceiling lamp over the table. Oak floor, light plaster walls. Keep it calm and expensive: few things, well placed, nothing that looks like a toy. By the entrance, where I start, put a small wall panel with a lever. Lever up is the day scene. Lever down is the evening scene: the sun is gone, the lamps are on and the room is warm. A sign on the wall names the apartment: Residence 14B. It has to run on a standalone headset, so keep it light, and tell me what it costs to draw.

How it went

Runs
2 runs: the request above, then one follow-up request. A run ends only when the project builds and loads in a real browser without errors.
Started from
The Unreal Engine XR template: An Unreal Engine 5 project for OpenXR headsets whose level is a Python script: scanned furniture and props at real size, daylight that bounces, things to grab and switch, Blueprints the agent writes.
Notes and credits
The picture is Unreal's desktop renderer; a standalone headset uses the mobile renderer, without bounced light. The agent reported 107,476 triangles and 45 meshes, inside its budget for a standalone headset; no frame rate was measured, and it has not been tried on a headset. The second request asked for a brighter day scene and a furnished terrace. Furniture, surfaces and plants are scans from Poly Haven (CC0). AI: Claude Code.

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Graspable is a desktop app. Describe the scene you want, and the agent builds it as a real project on your computer and checks that it runs. It is free with your own AI account.

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