proxy-fit

Clothes, hair and anything else made for a base body, fitted to every shape of it. This is MakeHuman's .mhclo binding, read from the format and re-implemented (no MakeHuman code): each proxy vertex is a weighted point on a triangle of the base (three base vertices and their weights) plus an OFFSET, and the offset is scaled per axis by how far apart two reference vertices are on the body being fitted, so a coat is as loose on a large body as on a small one. Morph the body and every proxy follows: no per-body work, nothing to re-fit.

It is the one runtime fitter of the character creator (CHARACTER-DESIGN.md step 4): MakeHuman's CC0 clothes, hair and brows come with their bindings in the human pack, and hair made for another head is meant to be imported as a binding too.

Pure, so a recipe's outfit is fitted or checked headless:

• fitProxy(proxy, positions) places the proxy's vertices on a body (every pack vertex, the pack's frame)
• drawnPositions(proxy, fitted) expands them to the drawn vertices (split where a UV seam needs it)
• proxyWeights(proxy, vertexWeights) gives each drawn vertex its skin weights from the base vertices it is bound to, so a garment bends with the body on the body's own skeleton
• nearestWeights(...) lends weights to vertices that have none (the base's helper vertices, which clothes bind to)
• coveredTriangles(triangles, deleted) drops the body triangles a garment hides, so skin never shows through it
• underCover(hat, hair, triangles) drops the hair a hat covers, so hair never pokes through a hat
• smoothUnder(positions, triangles, mask) smooths the body where mask says (the pack's nipples region), for clothes to be fitted over: cloth bridges a small bump, it does not follow it

A binding with rigid groups keeps those parts' shape in all three (position, weights, expression movement): see proxy-rigid.