cb49b032df
Squashed from work; the fine-grained history is under tag archive/work-2026-08-26: - vjfx: 104 new presets — the transition lane fills out and the screen family goes wide - vjfx: three lanes land — engine hooks + hold stage, the videomesh engine, and the audio picture - vj: the thumbnail pipeline becomes one honest machine, and effects go livecodable - vj: thumbnails become mp4 — hardware-coded sheets at measured-4K cells, and the bake stops racing the GPU - store: the ceremony dies — batch publish, one transaction, and the engine stops re-reading its own log - store: the ceremony dies — batch publish, one transaction, and the engine stops re-reading its own log - vj: the console grows real transports, and the deck stops lying about reverse - vj: reverse earns a memory, and the effects stop aging - fab: a 3D creation shell and the viewer built on it
92 lines
4.7 KiB
Text
92 lines
4.7 KiB
Text
// TURN AWAY — deck A is a card standing in front of the camera; as the
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// fader travels it TURNS on its vertical axis and drifts back, and deck B
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// is simply there behind it, whole, the moment the card stops covering it.
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// No blend anywhere: every pixel is one deck or the other.
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//
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// Pattern taught: the plane-in-3D helper (`plane_uv` below, the family's
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// shared block — see the reference copy in the Perspective doc). Camera at
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// the origin looking down -z, one ray per fragment, the plane hinged at a
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// world point; the RAY and the EYE are pushed into the plane's frame by
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// the transposed rotation, where the plane is z = 0 and one divide gives
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// the hit. Flat, centred, at unit distance it returns `uv` exactly — which
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// is why t = 0 is deck A to the pixel.
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//
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// The card's BACK needs no flip: past edge-on the intersection already
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// reverses the u axis, so the mirrored picture comes for free and is only
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// dimmed — a turn reads as a card turning over, not a texture flip.
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{
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name: "Turn Away"
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engine: "transition"
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p0: 0.5
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dials: [
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{name: "SWING", bind: "p0", default: 0.5},
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{name: "FLIP", bind: "p1", default: 0.0},
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{name: "DIP", bind: "p2", default: 0.0}
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]
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shader: draw.DrawVjFxDuo {
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// ---- THE SHARED HELPER: one ray, one rotated video plane --------
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// The plane is the rectangle of half-extents (aspect, 1) * 0.5/f
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// whose HINGE sits at world (piv.x, piv.y, -d), spun about that
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// hinge by the Euler angles `ang` (Rz then Ry then Rx, radians).
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// Returns (plane u, plane v, on-quad 0/1, front-facing 0/1).
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plane_uv: fn(uv: vec2, ang: vec3, piv: vec2, d: float, f: float) -> vec4 {
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let a = self.aspect()
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let c0 = cos(ang.x)
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let s0 = sin(ang.x)
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let c1 = cos(ang.y)
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let s1 = sin(ang.y)
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let c2 = cos(ang.z)
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let s2 = sin(ang.z)
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// The ray through this fragment (y up) and the eye, both
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// measured from the hinge.
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let rd = vec3((uv.x - 0.5) * a, 0.5 - uv.y, 0.0 - f)
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let ro = vec3(0.0 - piv.x, 0.0 - piv.y, d)
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let r1 = vec3(rd.x * c2 + rd.y * s2, rd.y * c2 - rd.x * s2, rd.z)
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let o1 = vec3(ro.x * c2 + ro.y * s2, ro.y * c2 - ro.x * s2, ro.z)
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let r2 = vec3(r1.x * c1 - r1.z * s1, r1.y, r1.x * s1 + r1.z * c1)
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let o2 = vec3(o1.x * c1 - o1.z * s1, o1.y, o1.x * s1 + o1.z * c1)
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let r3 = vec3(r2.x, r2.y * c0 + r2.z * s0, r2.z * c0 - r2.y * s0)
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let o3 = vec3(o2.x, o2.y * c0 + o2.z * s0, o2.z * c0 - o2.y * s0)
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// Intersect z = 0. A ray running parallel to the plane is
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// NUDGED, never divided by zero — it lands far off the quad.
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let den = r3.z + (1.0 - step(0.0001, abs(r3.z))) * 0.001
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let k = 0.0 - o3.z / den
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let hx = o3.x + k * r3.x + piv.x
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let hy = o3.y + k * r3.y + piv.y
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let pu = hx * f / a + 0.5
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let pv = 0.5 - hy * f
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let onq = step(0.0, pu) * step(pu, 1.0) * step(0.0, pv) * step(pv, 1.0)
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* step(0.001, k)
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return vec4(pu, pv, onq, step(0.0, o3.z))
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}
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trans: fn(uv: vec2, t: float) -> vec4 {
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let tc = clamp(t, 0.0, 1.0)
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// Leaves slowly, clears fast — the turn is the whole story.
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let e = pow(tc, 1.25)
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// FLIP picks the shoulder it turns over.
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let dir = mix(1.0, -1.0, step(0.5, self.user.y))
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// SWING: 0.9..2.6 rad of yaw, well past edge-on at the top.
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let swing = 0.9 + 1.7 * clamp(self.user.x, 0.0, 1.0)
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let an = vec3(0.0 - e * 0.16, e * swing * dir, e * 0.10 * dir)
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// …and it drifts back while it turns, so it leaves the frame
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// instead of just going thin.
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let d = 1.0 + e * 1.15
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let p = self.plane_uv(uv, an, vec2(0.0, 0.0), d, 1.12)
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// Guarantee the far end: the last of the card is gone by t = 1.
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let vis = p.z * (1.0 - smoothstep(0.86, 1.0, tc))
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let ca = self.deck_a(vec2(p.x, p.y))
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// Back of the card: already mirrored by the intersection, so
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// only dimmed.
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let card = ca.xyz * mix(0.34, 1.0, p.w)
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// A hairline rim so the edge reads against deck B.
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let ed = min(min(p.x, 1.0 - p.x), min(p.y, 1.0 - p.y))
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let rim = (1.0 - smoothstep(0.0, 0.006, ed)) * vis
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let mut c = mix(self.deck_b(uv).xyz, card, vis)
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c = c + vec3(1.0, 1.0, 1.0) * (rim * 0.35)
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// DIP: duck through black mid-turn (0 = off, the stock look).
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let dim = 1.0 - 4.0 * tc * (1.0 - tc) * self.user.z * 0.9
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return vec4(c * dim, 1.0)
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}
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}
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}
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