How to Write 3D Render Image Prompts - Nano Banana 2

That last point is worth stating plainly, because half of all 3D prompts are built from renderer names. Words like “octane render” and “unreal engine” do have some pull, since they appeared in captions attached to a certain kind of glossy image, but they are vague and they are doing a job that concrete words do far better.

Say what the surface is made of. Matte clay with soft rounded edges. Brushed aluminium with fine directional scratches. Glossy injection-moulded plastic. Frosted translucent glass. Rough concrete. Each of these produces a completely different image, and each is something a person could verify by looking.

Renders live or die on lighting, and the lighting setups have names worth using. Soft studio lighting with a large key and a fill gives clean product shots. A single hard rim light against a dark background gives drama. Global illumination bouncing warm light off a coloured floor gives that soft ambient look common in modern 3D illustration.

Background belongs in the same clause. Infinite seamless backdrop, plain gradient, floating on a flat pastel colour — these are staging decisions that do as much for the render look as anything about the object itself. A convincing product render usually has a soft contact shadow under the object and nothing else in frame.