The extremes sweep

A character creator is judged on its worst screenshot, so Dramatis checks the worst bodies its sliders can make, with everything it can put on them (PLAN.md, "No broken fits at the extremes"). bun bin/extremes.ts builds the corner bodies, dresses each one in every garment and hairstyle alone, and reports what pokes through, where the skeleton goes wrong, and which garments hold up everywhere. The latest run is in reports/extremes.md, with its numbers in reports/extremes.json and its contact sheet in reports/extremes-sheet.png.

The sweep is general tosijs-3d work, built here first under src/upstream/extremes/ and bound for tosijs-3d (board task #3661). It is not part of Dramatis's API.

Which bodies

Every corner of all fourteen body sliders is 16,384 bodies; the sweep builds 133 of them:

• 64 macro corners: gender, age, muscle, weight, height and proportions, each at both ends, at an even ancestry mix. MakeHuman blends these as corners (they do not add), so only the full product finds the bad combinations. Age runs from 25 to 90: children are out of scope.
• 24 ancestry bodies: each pure ancestry on gender, weight and muscle extremes.
• 44 local-shape bodies: bust size and firmness, waist, chest depth and pecs, each at each end, on thin and heavy women and men, plus all of them out at once.
• The default body, so a garment broken everywhere is told apart from one broken at the extremes.

--quick keeps the default and the 32 macro corners at age 25.

What is measured

• Penetration. Each garment is fitted exactly as the creator fits it (tosijs-3d's proxy-fit over the body with its nipples smoothed, hats lifted 12 mm, armour 5 mm); Quaternius' hairstyles are placed through hair-fit. Every fitted vertex goes through a signed-distance inside test against the bare skin: the nearest triangle, signed by its angle-weighted pseudo-normal, with a three-ray parity vote far from the skin so a hole in the mesh cannot turn a deep point inside out. A vertex is visibly inside when it is deeper than the creator tucks the skin there, by more than 1 mm. An item fails on a body when more than 0.2% of its vertices, and more than three, are visibly inside.
• Bone-length sanity. UAL's 65 joints fitted to each body (tosijs-3d's humanRig): no bone collapses or grows more than 2x against the default after height, left and right agree within 3%, the spine, legs and arms run downward in the rest pose, and no joint leaves the skin.
• The worst cases, drawn headless into a contact sheet: front and side, the body grey, the item blue, red where it shows through.

Run it

bun bin/extremes.ts                    # the full sweep, about 40 minutes
bun bin/extremes.ts --quick --sheet    # 33 bodies and a contact sheet
bun bin/extremes.ts --only 'toigo_'    # only the matching items
bun bin/extremes.ts --from reports/extremes.json --sheet   # re-report a run

The pack and the hair library come from ../static-assets when it is beside the repo, otherwise from the CDN. Garment licences come from the MakeHuman asset packs' own metadata (each pack's JSON, and the CC0 header of each system asset); a garment with no licence found is listed as unchecked and is never a wardrobe candidate.

What it does not cover

Layering (two garments on one body), posed bodies (everything is at rest, so a sleeve through a bent elbow is not seen), and Quaternius' brows. No skin is tucked under hair, so a style modelled with an inner layer under the scalp counts it.