Step 9. The tier split was the work; Django was the easy half.
Tier 1 — the authored scene — is the document, and it is addressed as
independently versioned leaves rather than saved whole, so one vertex drag
cannot clobber a collaborator's keying. `domain/leaf` is the document as
path -> value; `domain/wire` puts it on the wire as transit, because JSON
has neither integer map keys nor keywords and a save would quietly turn
`{0 v}` into `{"0" v}`.
Tier 2 — the dense channel blocks — is content-addressed by a hash over
every input, with the detector version inside every key through the
analysis the block descriptor names. `flow/address`'s `block-knobs` is the
invalidation table, and `address-test` does not trust it: it re-freezes the
take once per knob and asserts the biconditional, that a block's bytes
changed if and only if its key changed. That found `brow-pos` not depending
on `contour-avg` — the brow ring is smoothed, the raise is not.
Tier 3 — frames and audio — is served by the hash of its bytes out of the
same store. A manifest now names frames and carries a URL for each, so the
frame layout stopped being a shared secret between a shell script and a
ClojureScript namespace, and the `?v=` cache-buster went with it: a blob's
name is the hash of its contents, so a stale copy is not a thing that can
happen. The synthetic take's `audio.wav` moved to `static/arthur/` — an
asset the project owns, not an extraction that churns.
The server verifies rather than trusting a name it was handed: it
recomputes every key from the descriptor stored beside it, refuses an
analysis that declares no detector version, and refuses a document naming
blocks it does not hold. It hashes the descriptor TEXT, because JS prints
an integral double as `1` and Python as `1.0`, and a scheme where both ends
re-render the numbers disagrees on the first parameter that happens to be
whole.
Two loose ends from step 8 closed on the way. `pack` no longer takes a
`(track, frame)` predicate whose call sites each re-derived a feature from
an index — every track names the feature it follows, which deleted five
hand-maintained mappings. And `:dev-http` is gone: Django serves the page,
shadow-cljs only builds into the staticfiles tree.
227 CLJS tests, 31 Django tests, green.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The absence mapping was asserted for two of the ten dense tracks. Each block
hands `pack` an :absent predicate that derives a feature from a track INDEX, so
the predicate and the vector literal beside it agree only by hand, in four
places — and three of the four blocks had nothing checking them.
Give each feature a DIFFERENT gap window, so a track wired to the wrong feature
shows up as absence inside somebody else's window. A single shared window passes
under any permutation, which is the failure port-plan mechanical fact #2 warns
about: swap left for right and every part is still roughly where it belongs, so
it survives inspection.
Verified by mutation, since a test that cannot fail is worth nothing. Swapping
the brow block's two tracks, and swapping eye-block tracks 1 and 3 while leaving
0 and 2 correct, both now fail loudly; neither was caught before.
Also pin the teeth. They are their own feature so they can carry their own
:area :teeth parameters, which means an occluded mouth sets no bit on them; they
are dropped regardless because they stencil on :mouth-in and scene/finish drops a
node whose stencil drew nothing. Both frames come from an unannotated reference
clip, because the interior only draws on an open mouth and a frame the mouth was
shut on would have passed for the wrong reason.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B87NVmiU36qQmN9gmFYnJ9
Step 8's data model, ahead of its controls. Nothing here is a UI.
domain/params holds every knob's definition once — default, applicable area,
value constraints and the areas a change would force to regenerate. flow/take's
literal knob map becomes a view of it, so the take's defaults and the future
parameter panel cannot drift apart.
domain/feature adds subjects, features and groups as document data the renderer
never reads. A feature ID is stable for the whole clip, across occlusion: a run
of visible frames is not a new identity. An eye pair is an explicit group of one
or two eyes of the same subject, so a profile view with one identified eye needs
no invented partner. Settings resolve area -> subject -> group -> feature, and
dropping an eye from a pair materialises its effective values first so playback
does not jump. scene/problems now validates all of it.
Presence becomes per-feature rather than per-subject. freeze's :absent predicate
takes a track as well as a frame, so one occluded eye can be absent while its
partner still has a value; a full-face miss still marks everything absent. A
manifest may annotate known gaps as one-based inclusive intervals, which ingest
expands into observation tracks before measurement. An unobserved eye then gets
no vote in the iris pairing and cannot steer the shared gaze — gaze falls back to
whichever eye is visible. Temporal filters still see a sample on every frame,
held from the last observed one, because the numbers are a rectangular buffer;
the state mask, not the buffer, is what says the frame has no value.
js/app.js gets the same occlusion lesson: leading nulls from a face that starts
occluded used to throw away the whole take, and the neutral frame could be chosen
from a held duplicate pose.
Parameter editing, scoped regeneration and a feature-level detector remain. Until
one exists, footage without annotations falls back to the full-face mask rather
than claiming occlusions it cannot see.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B87NVmiU36qQmN9gmFYnJ9
