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feat(cinema): near-plane fade (immersion step 2/6)

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Particles dissolve as they approach the camera (view-space -positionView.z,
smoothstep over [near, near+band]) so the upcoming flythrough never additive-pops
a sprite in your face. Folded into color + emissive so the bloom fades too.
Invisible at the default far camera. positionView confirmed working in the
SpriteNodeMaterial color node.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Sam Valladares 2026-06-22 13:58:14 -05:00
parent d9fb791af6
commit dad74d5aeb
1 changed files with 18 additions and 2 deletions
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20
apps/dashboard/src/lib/graph/cinema/storm.ts
View file

@ -51,6 +51,7 @@ import {
mx_noise_vec3,
vec2,
atan,
positionView,
} from 'three/tsl';
// note: .max()/.div()/.sub()/.cos()/.sin()/.log()/.lessThanEqual() etc. are
// fluent methods on TSL nodes — no import needed.
@ -147,6 +148,10 @@ export class SemanticComputeStorm {
// JARRING CLASH PAIR — which opposing inner/outer duotone is live (0..4). Set
// per beat so every figure is a fresh ice-vs-fire / acid-vs-blood collision.
private uClash = uniform(0);
// NEAR-PLANE FADE — particles dissolve as they pass very close to the camera
// (flythrough) so they never additive-pop. Distance band in world units.
private uFadeNear = uniform(2.0);
private uFadeBand = uniform(7.0);
// JS-side dream state (not uniforms): which figure is live + how many fired.
private dreamCount = 0;
@ -675,6 +680,16 @@ export class SemanticComputeStorm {
return isInnerC.select(innerRim, outerRim);
});
// ── NEAR-PLANE FADE ── particles dissolve as they approach the camera so
// the flythrough never additive-pops a sprite right in your face. View-space
// forward distance = -positionView.z. smoothstep 0→1 across [near, near+band]:
// ~0 right at the camera, 1 by the time it's a few units out (≈1 at the
// default far camera, so no visual change until we fly inside).
const nearFade = Fn(() => {
const d = positionView.z.negate();
return smoothstep(this.uFadeNear, this.uFadeNear.add(this.uFadeBand), d);
});
// ── THE COLOR BLAST ── the signature detonation chroma. Keyed on the LONG
// uBlast envelope (~2.8s) so the color OUTLIVES the physics burst (owner's
// "color too brief" fix). Two layers: a blackbody plasma core that cools as
@ -712,7 +727,7 @@ export class SemanticComputeStorm {
// through even during a detonation — the clash is the star, the blast is
// an accent (was fully overriding, which washed the contrast to rainbow).
const blastMix = smoothstep(float(0.0), float(0.85), clamp(this.uBlast, 0, 1)).mul(0.6);
return mix(world, blastColor().mul(rimFactor()).mul(this.uActDim), blastMix);
return mix(world, blastColor().mul(rimFactor()).mul(this.uActDim), blastMix).mul(nearFade());
})();
// emissiveNode: what the selective bloom reads — THE glow channel. Rim-gated
@ -724,7 +739,8 @@ export class SemanticComputeStorm {
// Same cap as colorNode so the bloom feeds on the CLASH colors, not a
// rainbow override.
const blastMix = smoothstep(float(0.0), float(0.85), clamp(this.uBlast, 0, 1)).mul(0.6);
return mix(world, blastColor().mul(0.85).mul(rimFactor()).mul(this.uActDim), blastMix);
// ×nearFade so the bloom ALSO dissolves near the camera (no near-plane flash).
return mix(world, blastColor().mul(0.85).mul(rimFactor()).mul(this.uActDim), blastMix).mul(nearFade());
})();
// One instanced sprite per particle. Small quads (0.1) keep individual