blender-hair-grooming

1# Hair grooming
2 
3The execution model is in `blender-core`. Hair physics details are in `blender-simulation`, and look-dev in `blender-lighting-lookdev`.
4 
5## One call each
6```
7scripts/groom.py -- --surface Head --mask Scalp --length 0.15 --children 150000 --clump 0.5
8scripts/groom.py -- --surface Head --mask Beard --length 0.02 --droop 0.2 --curl 0.004 --melanin 0.9 --name Beard
9scripts/groom.py -- --surface Body --length 0.025 --droop 0.3 --clump 0.3 --name Fur
10scripts/groom.py -- --cards Hair --card-count 150 --atlas-res 2048 --out //textures      # game hair cards
11```
12 
13## How pros groom
141. **Surface first**: the scalp is a mesh (or the head itself) with **UVs** (hair attaches by UV) and a **vertex group** painted where hair grows. That group becomes the density mask, so soft edges give a natural hairline.
152. **Guides → children**: a few hundred to a few thousand guides carry the shape, and thousands of interpolated children give the volume. Style the guides, never the children.
163. **Shape in layers**: length, then clump (strands gather into locks), then curl/wave, then frizz/noise, then profile (thin tips). Keep each a separate modifier you can toggle.
174. **Comb by hand** for anything hero: Curves Sculpt mode brushes (`Comb`, `Add`, `Puff`, `Pinch`, `Grow/Shrink`, `Smooth`, `Slide`, `Density`, `Delete`, `Pull Tips`). Procedural droop gives a believable base, not a hairstyle.
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