How to check an AI-generated 3D model before using it in a game

A generated model can look finished in a browser preview and still be a problem in your game. The preview shows you a shaded surface. Your engine cares about what sits underneath it: how many triangles there are, how they connect, how textures map onto them, and where the object's origin is.

This checklist applies to a model from any AI generator. The steps use Blender because it's free and opens the common formats, but the same checks apply in any 3D package. Menu names are from recent Blender versions and may shift between releases.

Before you start: decide what the asset has to do

A background rock and a player character have very different standards. Write down where the asset will appear, how close the camera gets, and whether it will deform. Those answers tell you which of the problems below matter and which you can ignore.

1. Check scale and orientation

Import the model and press N to open the sidebar, where the Item tab shows its dimensions. Generated models often arrive at an arbitrary size. Scale it to real-world proportions, then apply the transform with Ctrl + A and choose All Transforms, so your engine doesn't inherit an odd scale value.

Confirm the model faces the direction your project expects and sits on the ground plane.

2. Count the triangles

Turn on Statistics in the viewport Overlays menu. Compare the triangle count with what the asset is worth on screen. There's no universal budget, because it depends on your target hardware and how many copies appear at once. A small prop that uses more triangles than your main character is still a clear warning sign.

The Decimate modifier is the quick way to reduce a count. Watch silhouettes and UV seams as you lower it, and keep the original file in case you go too far.

3. Look for broken geometry

• Flipped normals. Turn on Face Orientation in the Overlays menu. Blue faces point outward and red faces point inward. In Edit Mode, Mesh, Normals, Recalculate Outside fixes most of them.
• Holes and non-manifold edges. In Edit Mode, use Select, Select All by Trait, Non Manifold. This matters most for anything you plan to 3D print or use with boolean operations.
• Duplicate vertices and loose pieces. Mesh, Merge, By Distance removes duplicates. Mesh, Clean Up, Delete Loose removes stray geometry.
• Hidden areas. Orbit to the underside and any area the prompt or reference image didn't describe. Image-to-3D has to guess at what it can't see, so these are often the weakest parts.

Blender's manual covers the mesh clean-up tools in more detail.

4. Judge the topology against how the asset moves

Generated meshes are often dense, uneven triangles. For a static prop, that may be fine once the count is reasonable. For anything that bends, such as a character's elbow, you need edges that flow around the joint. If they don't, plan for retopology, either by hand or with a dedicated tool, and test a deformation before you commit to the asset.

5. Inspect UVs and textures

Open the UV Editing workspace and look at how the texture is laid out. Automatic unwraps are often fragmented into many small islands, which makes hand-painting difficult and can cause visible seams.

Then look at the texture itself:

• Baked-in lighting. Shadows or highlights painted into the color map will look wrong under your game's lights. View the model in Material Preview and rotate the light to check.
• Resolution. Check that it suits both the asset's size on screen and your platform's limits.
• Material maps. See which maps came through, such as normal or roughness, and whether your engine reads them correctly.

6. Set the origin

Put the origin where the object should pivot: at the base for a prop that sits on the floor, at the hinge for a door. Object, Set Origin has the options. It takes seconds here, and it saves you from fixing placement on every instance later.

7. Test it in the real engine

Nothing above replaces seeing the asset in your game, under your lights, at your camera distance. Our guide to importing AI-generated models covers the engine-specific steps.

8. Confirm you're allowed to ship it

Read the generator's current terms for your plan before an asset goes into a commercial project. Rights can differ between free and paid tiers, and the visibility of generated models can vary as well. Also look at what you put in: a reference image you don't have rights to is a problem no matter what the tool's terms say.