Guides
Text, image or sketch to 3D: which input should you use?
When to use a text prompt, a photo or a sketch to generate a 3D model with AI, what each gives you control over, and where each one goes wrong.
3 min read
Quick answer
Should I use text, an image or a sketch to make an AI 3D model?
Use text when you want ideas fast and do not mind surprises. Use a photo or reference image when you need a specific look. Use a sketch when the silhouette and proportions matter most, which is common for game props and concept art. The more visual the input, the less the generator has to guess.
The trade: speed against control
Every AI 3D input is a trade between how quickly you can start and how much the result looks like what you had in mind. A sentence takes seconds to write and leaves almost everything to the model. A sketch takes a few minutes and pins down the shape. A photo pins down nearly everything, including things you might not want.
Many generators turn text and sketches into an image first and build the 3D model from that image. Vi3W does this with sketches: it renders your lines into a full-colour image you can check before the 3D step. So the question is really: how much of that image do you want to decide yourself?
Text to 3D
You describe the object in words. See text to 3D.
- Good for: exploring ideas, filler props, quick variations, and objects everyone pictures the same way, such as a wooden barrel.
- Weak at: specific proportions, unusual designs, and anything where "I'll know it when I see it" is the brief.
- Tip: describe the object, its material and its style. Leave out camera angles and scenery. Writing prompts for AI 3D covers the rest.
Image to 3D
You upload a photo, a render or concept art. See image to 3D.
- Good for: matching an existing look, a real product, or a piece of approved concept art.
- Weak at: the back of the object. The model has to invent what the image does not show. Busy backgrounds and strong shadows confuse it too.
- Tip: one object, centred, on a plain background, in soft even light. A three-quarter view shows more of the form than a straight-on shot.
- Rights: use images you own or have permission to use. A model built from someone else's product photo inherits that problem.
Sketch to 3D
You draw it. See sketch to 3D.
- Good for: controlling silhouette and proportion without committing to colour, material or lighting. It is how concept artists already think, which makes it a natural fit for game props and character accessories.
- Weak at: detail you did not draw. A sketch says less about material than a photo, so the model fills that in.
- Tip: clean, closed outlines and a clear viewing angle work better than loose, overlapping strokes. You do not need to draw well. You need to draw clearly.
A quick way to choose
- Do you already have a picture of the thing? Use image to 3D.
- Do you know the shape but have no picture? Sketch it.
- Do you only have an idea? Write a prompt, generate a few, then refine the best one with a sketch or image.
Whichever you pick, the output needs the same checks
All three inputs end at the same place: a textured mesh. Check scale, topology, UVs and materials before you use it. The seven-point inspection covers this. Vi3W takes all three inputs, runs automatic retopology on the result, and exports GLB, FBX or OBJ.
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