blender-retopology-uv

1# Retopology & UVs
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3The execution model is in `blender-core`.
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5## Retopology
6**Automatic** (`scripts/auto_retopo.py -- --objects Sculpt --tris 8000 --method ...`) makes `<name>_low` and leaves the source hidden:
7| Method | Use for | Notes |
8|---|---|---|
9| `quadriflow` | organic props, static characters, scans | clean quads. Voxel-remeshes first so the input is manifold; UVs are lost (re-unwrap) |
10| `decimate` | background props, LODs, AI-generated meshes | keeps UVs/shape, gives triangles. Fast |
11| `planar` | hard-surface CAD/boolean results | dissolves flat areas; keeps seams/sharp/material/UV borders |
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13**Manual** (hero characters, anything that deforms). Set up a new mesh object with a Shrinkwrap modifier (`PROJECT`, target = sculpt), snapping to `FACE_PROJECT` + `use_snap_project`, and the source in a different viewport color/x-ray. Auto retopo isn't good enough for deforming hero meshes, because the edge flow below matters.
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15### Edge flow rules for deforming meshes
16- Concentric loops around the eyes and mouth (≥3 rings). The nasolabial loop flows from the nose wing to the mouth corner.
17- **3 loops** at every bending joint (elbow, knee, finger knuckles), plus a loop on each side to keep volume. The shoulder needs extra loops for raising the arm.
18- Keep poles (3/5-edge verts) out of bending areas. Put them on flat, stiff regions (chest, back of skull).
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