AI-Generated Textures for Unity and Godot
AI can generate a texture in seconds, but it hands you a flat color image, not a game-ready material. Here's what that image actually gives you and how to get it into Unity or Godot without fooling yourself about what it can do.
I use AI-generated textures in my own projects, and the thing nobody tells you upfront is that you're only getting one map. You ask for a stone wall texture and you get a nice-looking stone wall image — but a real game material usually wants a normal map, a roughness map, maybe an ambient occlusion map too, and the generator isn't giving you any of those. Here's how I actually use these images without overselling what they are.
What you're really generating
An AI image generator gives you a flat, lit color image. In PBR terms that's roughly your albedo or base color map — the "what color is this surface" layer. It is not a normal map, not a roughness map, not a height map. If your prompt includes lighting and shadow, that lighting is baked into the pixels, which is exactly what you don't want in an albedo map because it'll double up with your engine's real-time lighting. So the first prompt rule is to flatten the lighting on purpose:
seamless stone wall texture, top-down view, flat even lighting, no shadows, no highlights, tileable, PBR base color, high detail
The "flat even lighting, no shadows" part matters more than people expect. Drop it and you get moody, directional light baked into the stone, which looks great as a standalone image and terrible as a tiling material under your game's lighting.
Getting the other maps
Since you only have a color image, here's the actual path to a full material:
- Normal map — run the albedo through a tool like Materialize (free) or a normal-map filter in GIMP. These estimate bumps from brightness contrast in the image; they're an approximation, not a scan of real geometry, so fine detail can come out mushy.
- Roughness map — same idea, usually a desaturated, contrast-adjusted version of the albedo. Materialize can spit one out alongside the normal map.
- Or just skip it — for a lot of stylized or mobile games, an albedo-only material with no normal map looks completely fine. Don't add complexity you don't need.
Getting it tileable
Same caveat as any AI-generated background: the generator does not reliably produce a texture that tiles edge-to-edge without a seam. Treat "seamless" and "tileable" in your prompt as a request, not a guarantee. After generating:
1. Open the image in Photoshop, GIMP, or Aseprite.
2. Apply an offset filter (Photoshop: Filter > Other > Offset, 50% width and height — GIMP has the same under Filters > Map > Offset).
3. This shifts the seam to the middle of the canvas where you can see it clearly.
4. Clone-stamp or heal across the seam, then offset back to check.
For organic textures like stone, dirt, or foliage, this is usually a five-minute fix. For anything with a strong repeating pattern (brick coursing, tile grout lines), it takes longer because misaligned lines are more visible than a blurry seam.
Importing to Unity
1. Drop the PNG into Assets/Textures.
2. Select it, and in the Inspector set Wrap Mode to Repeat (this is what makes it tile on a mesh instead of stretching).
3. Create a material, drag the texture into the Albedo slot, and adjust the Tiling values on the material to control how many times it repeats.
4. If you generated a normal map separately, drag it into the Normal Map slot and set its Texture Type to "Normal map" in the import settings, or Unity will read it as color data and it'll look wrong.
Importing to Godot
1. Drop the PNG into res://textures/.
2. In the Import dock, set Filter off if you want crisp pixel-art style texels, on for smooth material look; set Mipmaps on for 3D use.
3. Assign it to a StandardMaterial3D's Albedo slot, and set the UV1 Scale (e.g., Vector2(2, 2)) to control tiling density on a mesh.
Where it still struggles
- You are not getting real PBR maps out of the generator — only a color layer. Anything beyond that is a separate step with separate tools.
- Tiling is not guaranteed. Budget time for the offset-and-fix pass, especially on textures with visible repeating structure.
- Resolution tops out at whatever the generator supports, which may be lower than the 2K or 4K textures a shipped game usually wants — you may need to upscale afterward, and upscaling doesn't invent detail that wasn't there.
- Consistent style across a whole texture set (matching stone floor, wall, and ceiling) takes the same discipline as consistent characters — see tileable game backgrounds for the prompt patterns I use to keep a set looking related.