100 lines
4.6 KiB
Markdown
100 lines
4.6 KiB
Markdown
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# The Chamber as a Volume — acrylic stack spec & depth design
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A backlit, six-plane physical piece for the eufyMake E1: three acrylic sheets,
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printed front **and** back, spaced with air gaps over an LED panel. This is
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roadmap Phase 3 made literal — the scene model's per-track `z` and `age` stop
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being opacity tricks and become actual millimetres.
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## Physical stack (proposed — buy list at bottom)
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```
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viewer
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─ C-front the hand: grease pencil, réseau, fiducials, header, scratches
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═ sheet C 3 mm clear cast acrylic
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─ C-back near scatter: δ-ray curls, close cosmics
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~6 mm air gap
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─ B-front THE EVENT: sharp beaded track cores
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═ sheet B 3 mm
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─ B-back halation: the same tracks, blurred — real glow-behind-the-line
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~6 mm air gap
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─ A-front history: older background events, sinking
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═ sheet A 3 mm
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─ A-back the cause: pressure disk (CMYK-only → pure glow) + chamber optics
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~12 mm gap
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▤ diffuser frosted acrylic 2–3 mm (kills LED hotspots)
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▦ LED panel A3 slim light pad
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```
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Plane depths (A-back = 0): 0 / 3 / 9 / 12 / 18 / 21 mm — two depth scales:
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3 mm *within* a sheet (fine parallax: halation, moiré) and 9 mm *between*
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sheets (coarse parallax: cause → event → hand).
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**The depth story is causal, not just spatial**: deepest plane is the cause
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(the pressure wave, pure transmitted light), then history, then the halation,
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then the event itself, then the debris flying toward you, and finally — on the
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front glass, where scanners actually wrote — the human hand measuring it all.
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Parallax reads as *interpretation floating above evidence*.
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## Sheet & print geometry
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- Sheet: 330 × 420 mm (E1 full bed, A3+), portrait. 3 mm clear cast acrylic,
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gloss both faces.
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- Art square: 300 × 300 mm, centred horizontally (15 mm margins), top edge at
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y = 20 mm. Zone below (y = 320–420) carries film furniture / data box /
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caption on C-front only; other sheets stay clear there (light spills through
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— the plate floats in a lit void).
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- Corner mounting holes 5 mm ∅ at 8 mm insets, all sheets + diffuser, for M4
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nylon standoffs (3 mm + 6 mm + 6 mm spacer stacking, or threaded rod with
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nuts as spacers).
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- Registration: every plane file carries corner crosses at the same four
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coordinates just outside the art square; back-face files are **mirrored** at
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export so they read correctly through the sheet.
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## White-ink logic (backlit grammar)
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| zone | channels | lit result |
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|---|---|---|
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| clear acrylic | none | pure light |
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| glow elements (disk, halation, deep tracks) | CMYK only | stained-glass — light pours through colour |
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| focal ink (event cores, grease pencil, furniture) | CMYK + white underlay | holds density against the panel — reads as ink |
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| blocking (none in v1) | white + black | opaque |
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Rule of thumb: **depth = transparency**. The deeper the plane, the less white
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ink; the front glass is the most "solid" ink. The disk gets *zero* white — lit,
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it becomes a light source (the laser-interference reference lives here, later).
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## Pipeline
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```
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plan (fable/stack/plans/*.mjs)
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→ node tools/stack-render.mjs <plan> per-plane SVGs + manifest.json
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→ fable/stack/simulator.html?c=<id> parallax + backlight art-direction
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→ [next] tools/stack-export.mjs print masters: mirrored backs,
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white-ink masks, A3 layout @ true scale
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```
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`src/render/stack.js` splits one generated scene into per-plane sub-scenes
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(selectors: track kind / z band / age band; disk, optics, damage, media,
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fiducials, header as flags) and renders each through the untouched `renderSVG`
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with `transparentPaper`. Bloom/core pairs use the *same* track selector so
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bubble positions are identical on both faces (same filtered list → same salted
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draws) — keep `density`/`size` equal within a pair.
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Per-plane renders set `depth`/`aging` low: the physical stack now *is* the
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depth model; double-encoding it as opacity would fight the medium.
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## Calibration coupon (print before the hero)
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One A5 sheet, double-sided: white-ink step wedge (0/25/50/75/100%, single +
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double pass) · the same δ-ray at three white levels · CMYK-only vs CMYK+white
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swatch pair · front/back registration cross · 6 pt / 8 pt mono type both faces.
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Judge **lit on the panel**, not in hand.
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## Buy list (if starting from zero)
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- 3× cast clear acrylic 330 × 420 × 3 mm (+1 spare), protective film both sides
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- 1× frosted/opal acrylic 330 × 420 × 2–3 mm (diffuser)
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- A3 slim LED light panel (dimmable if possible)
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- M4 nylon standoff kit (assorted 3/6/12 mm) or 4× M4 threaded rod + nuts
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- IPA + lint-free cloths; adhesion promoter if the E1 profile recommends it
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