Google just launched Gemini Omni, a new video model that can take a clip of an empty room and reimagine it in completely different interior styles, all while keeping the architecture, lighting, and camera path consistent. For construction firms, property developers, and interior designers, this is a fast way to show clients what a finished build could look like furnished, before a single piece of furniture is bought.
Here is the full workflow, plus a fallback if you do not have a walkthrough video to start with.
What You'll Need
A Google AI subscription (Plus, Pro, or Ultra)
Access to Gemini Omni (rolling out in the Gemini app and Google Flow)
A short walkthrough video of an empty, finished room (10 to 30 seconds works best). Phone camera is fine.
Optional: a still image of the room generated by Nano Banana Pro 2, if you don't have a real video yet
Step 1: Capture Your Walkthrough Video of the Empty Room
Walk slowly through the room with your phone held steady at eye level. Keep the camera moving in one continuous direction. Avoid zoom and shaky pans. 10 to 30 seconds is the sweet spot.
Tips for a clean walkthrough:
Shoot in daylight if possible. Even lighting helps Omni keep the room consistent across variations.
Avoid people, signage, or anything you don't want in the final video.
Try to capture the floor, ceiling, and at least one full wall in the same shot.
Hold the phone in landscape (16:9) for the best output ratio.
Step 2 (Alternative): Generate the Walkthrough With Gemini Omni
If you don't have a real room to film yet, you can have Gemini Omni generate the walkthrough from scratch. This is useful for pitching off-plan projects. Below is an example created with Omni in Google Flow.
Try using this base prompt:
Create a 15-second walkthrough video of an empty, newly built luxury residential interior. The camera slowly walks forward through the room. Pale oak herringbone floors, full-height crittall windows letting in afternoon light, exposed black steel beams across a high ceiling, one feature wall of unrendered brick. Camera at eye level, wide angle, soft natural daylight, no furniture, photorealistic. Hold the camera steady throughout.
Customisation: swap the floor, window, and wall details for the actual specifications of your project. The more specific you are about materials, the closer the output will match your real build.
Step 3: Upload the Video and Brief Omni on the First Variation
Open the Gemini app, drop your walkthrough video into the chat, and describe the first interior style you want to see. Be specific about furniture, palette, and mood.
Customisation: replace "warm Scandinavian" with the style your client has asked for. Common variations: industrial, mid-century modern, classic family home, biophilic, dark academia, Japandi.
Step 4: Generate Two More Variations From the Same Video
Once the first variation looks right, ask Omni to produce two more from the same source clip. The architecture and camera path stay locked, only the furnishing changes.
Try these ideas for inspiration:
Now take the same walkthrough video and dress the room in an industrial style. Add a tan leather Chesterfield sofa, a black steel and reclaimed wood coffee table, vintage Edison bulb pendant lights, a large abstract canvas above the sofa, and a single distressed Persian rug. Keep architecture, lighting, and camera path identical to the original.
Take the same walkthrough video and dress the room in a family-friendly style. Add a deep navy modular sectional sofa, a soft cream rug, a round bouclé ottoman, a low oak bookshelf with woven storage baskets, a play corner with a small teepee, and warm table lamps. Keep architecture, lighting, and camera path identical.
You now have one empty walkthrough and three styled variations from the same source.
Step 5: Refine Specific Details Through Conversation
Omni keeps the conversation going. If a client asks for changes, you don't need to start over.
Try this:
In the Scandinavian variation, swap the pale grey sofa for a soft beige boucle one and add a thin black metal floor lamp behind it.In the industrial variation, replace the Persian rug with a flatweave black and cream rug, and add a vintage steamer trunk as a side table.In the family variation, add two children's books on the coffee table and soften the lighting to a warmer tone.Customisation: refinements work best one or two at a time. "Change everything to make it warmer" gives mixed results; "swap the rug for X and warm the lighting" is precise enough to land.
Step 6: Generate Stills With Nano Banana for a Full Pitch Pack
Video is the hero, but clients also want printable images for spec sheets and brochures. Take a still frame or two from each variation and use Nano Banana to upscale or re-render them at higher resolution.
Try this:
Take this still from my Scandinavian variation and re-render it as a magazine-quality architectural photograph at 4K. Keep the room, furniture, and lighting identical. Sharpen the texture detail on the rug, sofa, and wood floor.
You now have a complete pitch pack: one empty walkthrough, three styled walkthroughs, and three magazine-quality stills.
Real-World Applications
Construction Firms
Show buyers what a newly completed home or commercial space will look like furnished before any furniture arrives. Useful for handover walkthroughs and PR shots while the build is still empty.
Property Developers
Pitch off-plan apartments with three styled variations of the same unit, so buyers can pick the layout that fits their lifestyle. Generate them from a single empty walkthrough.
Interior Designers
Send clients three concept directions in a day instead of producing three full mood boards. Use the chosen variation as the brief for the real fit-out.
Architecture Firms
Demonstrate how the same space adapts to different occupants or use cases (residential, hospitality, office) in pitches and award submissions.
Next Steps
Try it on a project you are working on right now. If you have a finished but unfurnished room, film a 15-second walkthrough this afternoon and run it through the framework above. By tomorrow you will have a pitch pack that used to take a week.
Start with this prompt:
Take this walkthrough video of an empty room and dress it in [STYLE]. Add [3-6 specific furniture pieces]. Keep architecture, lighting, and camera path exactly as they are in the original. Photorealistic.