The process of rebuilding a polygon mesh with cleaner, more efficient topology, typically over a high-resolution sculpted mesh, to improve printability or downstream operations.
High-resolution sculpted meshes (from ZBrush, Blender Sculpt Mode) have millions of irregular triangles that are topologically chaotic: no edge flow, random face sizes. Retopology replaces this chaos with a clean, purposeful quad mesh with uniform face sizes and edge loops that follow the model's form. Manual retopology traces new quads over the sculpt surface; automatic retopology (ZRemesher, Blender Remesh, Meshmixer Remesh) produces clean quads algorithmically.
For 3D printing, retopology of figurines and organic sculpts achieves three goals: (1) reduces polygon count to manageable file sizes for slicing, (2) ensures manifold geometry (sculpted meshes often have non-manifold regions), and (3) enables clean subdivision surface smoothing for resin print masters. ZRemesher with 'ZRemesh by Polygroups' is the fastest workflow for figurine-class models targeting SLA/MSLA printing.
Automatic retopology algorithms can fail on thin features (horns, fingers, wires): these areas require manual retopology or separate treatment. Over-decimated retopology loses fine surface detail: always compare the retopologized mesh against the sculpt at intended print scale. Do not confuse retopology (rebuilding topology) with decimation (reducing polygon count without restructuring topology); decimation preserves original chaotic topology but with fewer polygons.
Related terms: Mesh Topology, Subdivision Surface, Polygon Count, Mesh Decimation
| Field | 3D design, 3D printing |
|---|---|
| Also called | retopo, remeshing |
Engineer, author of The Big Book of 3D Printing and additive manufacturing expert