Scenic family "Supernova": cosmic burst with electric tendrils

From the reference video: bright crackling core, organic branching
lightning filaments (ridged fbm in mirrored polar space, slowly rotating
to hide the seam), two layers of radial particle streaks flowing outward,
nebula haze. Bass pumps filaments and outflow speed, beat punches the
core, treble twinkles the particles. Family index 43 (fieldRGB path).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/effects.js

@@ -52,7 +52,8 @@ const FAMILIES = [
   { name: 'Solidi 3D', scale: 1.0 },
   { name: 'Griglia Neon', scale: 1.0 },
   { name: 'Tunnel Neon', scale: 1.0 },
-  { name: 'Tempesta Plasma', scale: 1.0 }
+  { name: 'Tempesta Plasma', scale: 1.0 },
+  { name: 'Supernova', scale: 1.0 }
 ];
 
 // Palettes: low colour (a) -> high colour (b), plus optional hue-cycle/sat.

src/shaders.js

@@ -545,6 +545,52 @@ vec3 scTempesta(vec2 uv) {
   return col;
 }
 
+// Cosmic burst: bright core, organic electric tendrils (ridged fbm in polar
+// space) and a radial stream of particle streaks over a nebula haze.
+vec3 scSupernova(vec2 uv) {
+  float r = length(uv) + 1e-4;
+  // slow frame rotation hides the polar seam / mirror axis
+  float a = atan(uv.y, uv.x) + uT * 0.05;
+  float aM = abs(mod(a, 6.2831853) - 3.14159265); // mirrored, seam-free angle
+  vec3 col = vec3(0.0);
+
+  // nebula haze
+  float haze = fbm(uv * 2.0 + vec2(uT * 0.03, 0.0));
+  col += mix(uColorA, uColorB, haze) * haze * 0.3 * smoothstep(1.4, 0.15, r);
+
+  // electric tendrils: ridged fbm flowing outward; brightness pumps with bass
+  vec2 pp = vec2(aM * 2.3, pow(r, 0.65) * 6.0 - uT * (0.55 + 0.9 * uBass * aMix));
+  float n1 = fbm(pp);
+  float ridge = abs(n1 - 0.5) * 2.0;
+  float fil = pow(1.0 - clamp(ridge * 2.4, 0.0, 1.0), 6.0);
+  fil *= smoothstep(1.25, 0.12, r) * smoothstep(0.015, 0.12, r);
+  // iridescence: alternate the palette colours along the filament
+  vec3 filCol = mix(uColorB, uColorA, fract(n1 * 3.0));
+  filCol = mix(filCol, vec3(1.0), fil * 0.18); // slightly hot filament cores
+  col += filCol * fil * (0.75 + 1.2 * uBass * aMix);
+
+  // radial particle streaks (warp-burst): polar cells drifting outward
+  for (int L = 0; L < 2; L++) {
+    float fl = float(L);
+    vec2 sp = vec2(aM * (16.0 + fl * 9.0),
+                   log(r) * (5.0 + fl * 2.0) - uT * (1.1 + fl * 0.7 + 2.0 * uBass * aMix));
+    vec2 g = floor(sp), f2 = fract(sp);
+    float h = hash(g + fl * 17.0);
+    vec2 o = vec2(hash(g + 1.7), hash(g + 3.1)) * 0.6 + 0.2;
+    float d = length((f2 - o) * vec2(1.0, 0.55)); // slightly elongated along the radius
+    float p = smoothstep(0.11, 0.015, d) * step(0.42, h);
+    p *= 0.45 + 0.55 * sin(uT * 3.0 + h * 6.283 + uTreble * aMix * 5.0);
+    col += mix(vec3(0.75, 0.92, 1.0), uColorB, hash(g + 5.3)) * p
+         * (0.35 + 0.4 * uLevel * aMix) * smoothstep(0.03, 0.2, r);
+  }
+
+  // white-cyan core with a crackling fbm edge; punches on the beat
+  float core = exp(-r * r * 150.0);
+  col += mix(vec3(1.0), uColorB, 0.25) * core
+       * (0.9 + 0.9 * uBeat * aMix) * (0.85 + 0.5 * fbm(uv * 18.0 + uT));
+  return col;
+}
+
 vec3 fieldRGB(int f, vec2 uv) {
   if (f == 34) return scCielo(uv);
   if (f == 35) return scAurora(uv);
@@ -554,7 +600,8 @@ vec3 fieldRGB(int f, vec2 uv) {
   if (f == 39) return scSolidi(uv);
   if (f == 40) return scGriglia(uv);
   if (f == 41) return scTunnelNeon(uv);
-  return scTempesta(uv); // f == 42
+  if (f == 42) return scTempesta(uv);
+  return scSupernova(uv); // f == 43
 }
 
 vec3 colorizeRGB(vec3 c, vec2 uv0) {