AI rendering for interior designers — what works, what doesn't
A practical look at AI rendering for interior design: when Render (AI) beats path tracing, how to keep your model recognisable, and where Stability vs Gemini each shine.
AI rendering ≠ replacing renders
There's a temptation to throw your model at an AI and expect a hero shot. Sometimes that works. Often it produces something photorealistic but wrong — walls drift, furniture morphs, a window becomes a fireplace. Used carefully, AI is a fantastic finishing pass; used naively, it's a slot machine.
Here's what we've learned shipping AI rendering into a floor plan tool.
Path trace first, AI second
The most consistent workflow is to path trace the scene first, then run Render (AI) on the result. Path tracing gives the AI a structurally correct image to work from — straight walls, real shadows, predictable glass — so the AI's job becomes "make this look like a photo", not "invent a room from scratch".
Set AI Strength low (15–35%) and you get a polished version of your model. Crank it to 80% and you'll get something prettier but further from what you designed.
Gemini vs Stability
Both providers are good. Rough rule:
hallucinate dramatic styling.
preset selector. Better when you want "moody", "Scandinavian", "industrial loft" etc.
- Gemini — better at clean, neutral interiors. Less likely to
- Stability — wider creative range, especially with the style
We default to Gemini because it's more predictable; switch to Stability when you want flavour.
Use AI for moodboards, path tracing for client signoff
The two-pass workflow lets you have your cake. Pump out a dozen quick Render (AI) variations during early design exploration. When the client picks a direction, drop AI Strength down to 15% and re-render — that's your signoff image, still photoreal but anchored to the actual design.
Aspect ratios
For AI Video, 16:9 is what clients expect and what looks best on a laptop. 9:16 is for social — Instagram reels, TikTok. The 8-second cap on Runway video is short by design; pan around one hero view rather than trying to do a full walkthrough.
What to keep in mind
Strength is at 50%, you might get 4.
legible.
- AI cannot keep counts of things. If your kitchen has 3 stools and AI
- Materials drift. Marble can become granite, oak can become walnut.
- Text is unreliable. Don't expect signage on a wall to come back
For literal accuracy, path tracing is still the only answer. AI is a style pass — that's the right way to use it.