Phase 10 W1: de-noise Mix visualizer, clip to live player-bar height, redraw lava-lamp icon

DeepDrftPublic/Interop/visualizer/MixVisualizer.ts

@@ -855,9 +855,13 @@ void main() {
     //     most effective "this is glass" cue (spec §4f.4).
     float fresnel = pow(1.0 - max(dot(N, V), 0.0), GLASS_FRESNEL_POWER);
 
-    // Frosted translucency: a subtle noise modulation of alpha so edges read soft/lit
-    // rather than hard — the "frosted glass" cue done in-shader (no CSS blur, §4f.3).
-    float frost = 0.85 + 0.15 * valueNoise(vec2(screenX * 0.05, screenYTop * 0.05));
+    // REMOVED (Phase 10 W1 de-noise, spec §3): the screen-space "frost" alpha noise —
+    // frost = 0.85 + 0.15 * valueNoise(vec2(screenX*0.05, screenYTop*0.05)). It was a
+    // static value-noise keyed to SCREEN coordinates (not the moving fluid), so it sat as
+    // a fixed grainy/dirty film over the whole ribbon — exactly the "static-looking texture
+    // that makes the screen look dirty" Daniel rejected. Alpha is now the clean backdrop
+    // opacity with no grain. (Fluid-tied noise — the bubble swell and the colour-field drift,
+    // both keyed to mix-time — is retained: it moves with the audio and does not read as dirt.)
 
     // Compose the lit glass colour: field base + warped refraction, lifted by sheen and
     // a Fresnel rim toward the VIVID moss accent, plus a white-hot specular dot. Using the
@@ -867,9 +871,10 @@ void main() {
     lit = mix(lit, vividAccent * 1.3, fresnel * 0.7); // rim glows vivid moss
     lit += spec * vec3(1.0);                           // specular is white light
 
-    // Alpha: the backdrop opacity, lifted at the rim (Fresnel) so edges catch light, and
-    // softened by the frost. Pre-multiplied output for the ONE/ONE_MINUS_SRC_ALPHA blend.
-    float alpha = inside * RIBBON_OPACITY * frost;
+    // Alpha: the backdrop opacity, lifted at the rim (Fresnel) so edges catch light.
+    // (Frost removed — see the de-noise note above.) Pre-multiplied output for the
+    // ONE/ONE_MINUS_SRC_ALPHA blend.
+    float alpha = inside * RIBBON_OPACITY;
     alpha = clamp(alpha + inside * fresnel * RIBBON_OPACITY * 0.8, 0.0, 1.0);
 
     fragColor = vec4(lit * alpha, alpha);