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The face owns its placement, not the take that holds it

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The source-to-stage mapping moves off :main's :face group and onto each face's
own :place, above its head. `face-placement` computes exactly what it computed
before, over every subject together, so two faces filmed side by side keep
their filmed relation — it is written into each face instead of onto a group
above them all. Same transform, same subtree, one level lower, and the
composite is identical to the pixel: a digest over every op :main emits across
the whole take is unchanged either way.

THE OWNER IS THE POINT. A face carrying its own mapping is the right size
wherever it is put — dropped into another symbol, or opened in its own tab to
be drawn over — and the take that holds it needs to know nothing. On a group
above the instances the scale belonged to the take, so a face taken out of it
had no size at all and drew at a fraction of a pixel.

The pool's thumbnails drop the workaround that knew about this: a symbol is
rendered rooted at itself again, because a face now carries the placement that
makes that honest, so the pool needs to know nothing about where a symbol
happens to be used. `domain/node` and `arthur.export` leave its requires with it.

The tests here were reading the placement off :main. The photo registration
test changes shape rather than location: its premise was that face-1's head is
its own root, so a photo sitting where it was filmed was image pixels over
image height and nothing else. The head still cancels — that is what the test
is about — but it now cancels against the face's own placement, which is why
the photo comes with the face into its own tab instead of sitting at a
fraction of a pixel beside it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Your Name 2026-10-01 01:25:37 -04:00
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@ -39,7 +39,7 @@ measurements without losing the anchor choices.
A source image used for tracing should be registered with that image's measured
stabilizing transform, then the selected head transform, then the authored
`:face` placement. This makes the photo and head-local vectors share the same
`:place` placement the face carries. This makes the photo and head-local vectors share the same
orientation and position. Tracing-photo selection is a separate editor address;
it does not choose the head anchor.