Meshy AI (3D Generation)

Cleaning Up Models in Blender

35 分

Generated meshes often have problems: holes, internal faces, messy topology and odd texture seams. Blender (free) fixes them.

Import and inspect

  • Import GLB/FBX/OBJ (File → Import).
  • Apply a uniform scale and set real-world dimensions (N panel → Item → Dimensions) if the model will be printed or placed in AR.
  • Check faces from all angles in Solid view with Face Orientation overlay (blue outside, red inside) to spot flipped normals.

Common fixes

Problem Fix
Flipped normals Edit Mode → select all → Mesh → Normals → Recalculate Outside
Duplicate vertices Mesh → Clean Up → Merge by Distance
Holes select boundary edges → Fill (F) or Grid Fill
Too many polygons Decimate modifier (Collapse)
Non-manifold geometry Select → Select All by Trait → Non Manifold, then fix
Floating debris Separate by loose parts (P) and delete pieces

The 3D Print Toolbox add-on (built into Blender's extensions) checks manifoldness, thin walls and overhangs.

Retopology

For animation or clean editing, rebuild the mesh with even quad topology: the Quad Remesher add-on, Blender's remesh modifier (voxel) for printable solids, or manual retopology for hero assets. Then bake details from the original onto the new mesh with normal maps.

UVs and textures

If texture seams look wrong, re-unwrap (Smart UV Project is a fast start) and bake the original texture onto the new UVs. Check textures in Material Preview mode.

Export

  • Games and web: GLB with textures embedded, sensible polycount.
  • 3D printing: STL or 3MF, solid and manifold, correct scale (millimetres).
  • AR on iOS: USDZ (Blender or Reality Converter).

Exercise

Take a generated model, fix normals, merge duplicates, fill holes, decimate to a target polycount, check it with the 3D Print Toolbox, and export both a GLB (web) and an STL (print).

Check yourself

  • How do you spot flipped normals?
  • What does Decimate do?
  • Which formats suit printing and the web?

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