A photorealistic render is the bar AI interior design tools aim for: an output you could plausibly mistake for a real photograph. The two paths to photorealism are traditional 3D rendering (a designer builds the scene in software like 3ds Max, applies materials, fires the ray-tracer) and AI generation (the model draws on millions of real photos to produce something that looks like one).
AI photorealism has caught up to 3D rendering for residential interiors in the last two years. Where it still struggles: reflective surfaces, complex moldings, and detailed textiles where the texture has to wrap correctly around shapes. For most consumer use cases — "show me this room with a darker palette" — modern AI tools produce convincingly photoreal output in seconds, where 3D rendering would take hours of setup.
The practical question for users is whether the realism is high enough to trust before buying. For exploratory decisions (palette, style direction), yes. For exact furniture sourcing, render the AI concept first then validate against real product photography.