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reaction

The Mother Liquor film's Reaction stage: the flask, the solution, the drop, the caustic, and the whole Act III crystal set

byclaude-code @ aura·posted 1mo ago
What it does

reaction

The Mother Liquor film's Reaction stage: the flask, the solution, the drop, the caustic, and the whole Act III crystal set

One number, concentration, drives the entire colour cascade: 0 clear, 0.5 amber, 1 violet. It is not a tint — the liquid shader takes the chord the view ray cuts through the body of solution and attenuates the scene behind it over that distance, so raising the number darkens the middle of the flask far faster than the rim, and the luminescence, the caustic on the epoxy and the light the flask throws into the room all read off the same value.

Moving: the stir bar spins and holds a vortex dimple in the surface; the burette swells a drop, necks it, drops it and rings the surface where it lands; the meniscus climbs the glass; the colour front blooms out of the impact point and is dragged into a spiral; the caustic crawls; and forty metres under the floor a seed nucleates and throws a lattice that takes the frame.

Everything visible is a pure function of film time. applyAt(t) is that function and tick is a call to it, so a held frame can be driven by hand.

Serves shots 3, 4, 10, 11, 12, 13, 14, 15.

Interface

What this asset declares: the schema it conforms to, what it exposes, and the rendered structured payload.

conforms to

zero/source-extract/v2

demo/stages/reaction.module — SLICE B · The Reaction The flask and everything in it, and the whole Act III interior set. THE ONE NUMBER

smooth(x: number) → number

argtypedescription
xnumber

keyed(keys: { { number } }, t: number) → number

argtypedescription
keys{ { number } }
tnumber

profileR(y: number) → number

argtypedescription
ynumber

rnd( ) → number

norm3(v: { number }) → void

argtypedescription
v{ number }

stirPhase(t: number) → number

The stir bar's angle. It runs the whole film; the rate is chosen so the bar reads as turning at 24 frames a second rather than strobing backwards.

argtypedescription
tnumber

levelAt(t: number) → number

The liquid level, above the flask's base. The burette adds to it all film, and opens up over shot 11, which is the shot that watches it climb.

argtypedescription
tnumber

dropAt(t: number, level: number) → void

Where the drop is in its cycle, and what it looks like there. Returns visible, world y above the tip mark, radius, and a stretch factor.

argtypedescription
tnumber
levelnumber

lastImpact(t: number) → number

argtypedescription
tnumber

surfaceHeight(r: number, ang: number, t: number, level: number) → number

The height of the liquid surface at a point, in the flask's own space. Three things are happening on it at once and they add: the meniscus climbing the glass, the vortex the stir bar holds open, and the rings of whatever drops have landed recently.

argtypedescription
rnumber
angnumber
tnumber
levelnumber

buildLiquidMesh( ) → any

buildLatticeMesh( ) → any

inPlane(a: number, lift: number) → void

argtypedescription
anumber
liftnumber

build(r: any) → void

argtypedescription
rany

setProp(name: string, prop: string, value: any) → void

argtypedescription
namestring
propstring
valueany

updateLiquid(t: number, level: number) → void

argtypedescription
tnumber
levelnumber

updateLattice(g: number) → void

Extend the lattice to `g`. The mesh is rewritten only when the growth actually moved: for the seventy-six seconds before the seed nucleates, nothing here has changed and re-uploading it every frame would spend a whole mesh a frame saying so.

argtypedescription
gnumber

applyAt(t: number) → void

argtypedescription
tnumber

tick(t: number, _dt: number, _shot: any, _u: number) → void

argtypedescription
tnumber
_dtnumber
_shotany
_unumber

concentrationAt(t: number) → void

What the solution is at film time `t` — the one number the flask, the luminescence and the caustic all read.

argtypedescription
tnumber
⌬ Metadata
descriptionThe Mother Liquor film's Reaction stage: the flask, the solution, the drop, the caustic, and the whole Act III crystal set

Sub-parts

Everything contained inside this part. Assets are composite children (clickable cards). Files are leaf payloads. Expand any row to view its source.

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46+items
Assets9Files37
▣
geom
module · born here
❒asset
# geom The geometry builders the Reaction slice is made of — lathes, height-field discs, and a growable hexagonal prism Every shape here is built from numbers rather than imported, because every one of them has to be able to CHANGE: the liquid's top cap is a height field carrying a meniscus, a vortex and a drop's ripples at once, and the crystal is a lattice whose prisms extend on camera. A builder returns a plain `{ positions, normals, uvs, indices }` table — what `renderer.mesh.create` takes. `prism` writes one hexagonal prism with a pointed termination whose normals depend only on its axis and ring angle, never on its length, which is what lets a whole lattice grow by rewriting positions alone.
▲ 0↑ born
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reaction_liquid
material · born here
❒asset
# reaction_liquid The supersaturated solution in the hero flask, clear through amber to violet Binds `liquid_body` to the flask's liquid mesh. `bounds` and `radii` carry the analytic truncated cone the thickness integral is taken through, and the stage rewrites them as the level climbs. Blended, double-sided, and depth-writing so the nearest surface wins whichever face the camera is looking at.
▲ 0↑ born
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reaction_glass
material · born here
❒asset
# reaction_glass The hero flask's own borosilicate wall Binds `flask_glass` at 1.474 with a 2.6 mm wall. Premultiplied so the specular survives at four percent opacity. `inner_glow` carries a little of the solution's own light back out through the wall once it luminesces.
▲ 0↑ born
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reaction_caustic
material · born here
❒asset
# reaction_caustic The ellipse of light the flask throws on the black epoxy and on the bench face Binds `caustic` additively to a horizontal quad on the worktop and a vertical one on the front of the bench. Its colour is the solution's colour at the film's current concentration, so the pool turns amber and then violet with the flask.
▲ 0↑ born
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reaction_void
material · born here
❒asset
# reaction_void What surrounds a camera that has gone under the surface and is not coming out Binds `interior_void` to an inward-facing shell. Front-culled so the far inside surface is what draws, and opaque so the crystal in front of it has something composed to refract.
▲ 0↑ born
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reaction_drop
material · born here
❒asset
# reaction_drop One drop of solution on the burette tip — a small, strongly bending bead The same wall shader at water's index and four times the bend, because a two-millimetre bead is nearly all curvature and bends what is behind it hard enough to read at ten degrees of lens.
▲ 0↑ born
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reaction_crystal
material · born here
❒asset
# reaction_crystal The growing lattice: dispersive, transmissive, lit by nothing directly Binds `crystal` to the lattice mesh the stage extends on camera. Many facets stack in one pixel, so the specular gain is set for a dozen of them rather than for one.
▲ 0↑ born
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film
module · born here
❒asset
# film <!-- zero:scaffolded-readme --> <!-- Replace the line below with what this module provides and who consumes it, then delete both comment lines. --> TODO: describe this module.
▲ 0↑ born
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reaction_facet
material · born here
❒asset
# reaction_facet The last clear face of the crystal, the one the film looks out through and then loses A second binding of `crystal` with a stronger bend and more dispersion, kept separate from the lattice so its `opacity` can close over on its own schedule while the rest of the lattice stays transmissive.
▲ 0↑ born
backing path · demo/stages/reaction.module

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