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feat(cinema): volumetric fog depth (immersion step 3a/6)

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Distant particles dim toward the void with view depth (exp falloff) → real 3D
atmospheric recession, not a flat sprite cloud. Combined with the near-fade into
a SINGLE depthFade Fn — critical three@0.172 TSL constraint discovered: reading
positionView from a second Fn feeding the same material output triggers a cyclic
stack-overflow in the node type-resolver (getNodeType). One depth read, one Fn.

Gate: svelte-check 0/0, 937 tests, verified live (fog depth reads, no recursion).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Sam Valladares 2026-06-22 14:12:05 -05:00
parent dad74d5aeb
commit 3b342da9ea
1 changed files with 17 additions and 10 deletions
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27
apps/dashboard/src/lib/graph/cinema/storm.ts
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@ -152,6 +152,9 @@ export class SemanticComputeStorm {
// (flythrough) so they never additive-pop. Distance band in world units.
private uFadeNear = uniform(2.0);
private uFadeBand = uniform(7.0);
// VOLUMETRIC FOG — distant particles dim toward the void with view depth (exp
// falloff) for atmospheric depth. Combined with near-fade in one depth read.
private uFogDensity = uniform(0.012);
// JS-side dream state (not uniforms): which figure is live + how many fired.
private dreamCount = 0;
@ -680,14 +683,18 @@ 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);
// ── DEPTH FADE (near dissolve × volumetric fog) ── ONE Fn, ONE positionView
// read. Reading positionView from a SECOND Fn in the same material output
// triggers a cyclic type-resolution stack-overflow in three@0.172's node
// builder, so near-fade AND fog are combined here into a single depth read.
// near: smoothstep 0→1 across [near, near+band] (≈1 at far camera → no
// change until we fly inside; dissolves sprites at the camera).
// fog: exp falloff dims distant particles toward the void → 3D depth.
const depthFade = Fn(() => {
const d = positionView.z.negate(); // +forward view distance, read ONCE
const near = smoothstep(this.uFadeNear, this.uFadeNear.add(this.uFadeBand), d);
const fog = clamp(this.uFogDensity.mul(d).negate().exp(), 0.18, 1.0);
return near.mul(fog);
});
// ── THE COLOR BLAST ── the signature detonation chroma. Keyed on the LONG
@ -727,7 +734,7 @@ 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).mul(nearFade());
return mix(world, blastColor().mul(rimFactor()).mul(this.uActDim), blastMix).mul(depthFade());
})();
// emissiveNode: what the selective bloom reads — THE glow channel. Rim-gated
@ -740,7 +747,7 @@ export class SemanticComputeStorm {
// rainbow override.
const blastMix = smoothstep(float(0.0), float(0.85), clamp(this.uBlast, 0, 1)).mul(0.6);
// ×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());
return mix(world, blastColor().mul(0.85).mul(rimFactor()).mul(this.uActDim), blastMix).mul(depthFade());
})();
// One instanced sprite per particle. Small quads (0.1) keep individual