Per-zone effects in projection mapping

New 'Zona Effetto': each zone runs its own preset on an independent
offscreen Visualizer (960x540, own WebGL context), stepped with the
shared clock and audio so every panel dances to the same music with a
different effect (fluid presets included; interactive/3D excluded).
Zone row gains family/preset selectors; engines are created/destroyed
as zones change and their canvases uploaded as zone textures each
frame. Guide updated with the performance note.

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

src/control.html

@@ -213,6 +213,7 @@
         <div id="map-zones"></div>
         <div class="row">
           <button id="map-add-vis">➕ Zona Visual</button>
+          <button id="map-add-fx">➕ Zona Effetto</button>
           <button id="map-add-img">➕ Zona Immagine…</button>
           <input type="file" id="map-img-input" accept="image/*" hidden />
         </div>
@@ -224,8 +225,10 @@
             oggetti e superfici inclinate. Fuori dalle zone: nero.</p>
             <p><b>1. Attiva</b> — l'output passa in modalità mappatura.</p>
             <p><b>2. Crea le zone</b> — <b>➕ Zona Visual</b> mostra l'effetto live in corso
-            (qualsiasi famiglia, anche il ballerino 3D); <b>➕ Zona Immagine</b> incolla
-            un'immagine fissa su una superficie (corner-pin).</p>
+            (qualsiasi famiglia, anche il ballerino 3D); <b>➕ Zona Effetto</b> fa girare
+            nella zona un <b>preset indipendente</b> (ogni zona il suo effetto, tutti a tempo
+            con la stessa musica — ma ogni zona costa un rendering in più); <b>➕ Zona
+            Immagine</b> incolla un'immagine fissa su una superficie (corner-pin).</p>
             <p><b>3. Posiziona</b> — spunta <b>Modifica zone</b>: sull'output compaiono le
             maniglie. Trascina i <b>4 angoli</b> per adattare la zona alla superficie reale
             (guardando la proiezione!), oppure clicca <b>dentro</b> la zona per spostarla

src/control.js

@@ -1440,11 +1440,30 @@ function renderMapZones() {
     const row = document.createElement('div');
     row.className = 'map-zone';
     const isImg = z.src && z.src.type === 'image';
+    const isFx = z.src && z.src.type === 'effect';
+    let mid;
+    if (isImg) {
+      mid = '<span class="mz-src" title="' + (z.src.path || '') + '">' +
+        String(z.src.path || '').split(/[\\/]/).pop() + '</span>';
+    } else if (isFx) {
+      const cur = EFFECTS.list[z.src.effectIndex] || EFFECTS.defaults();
+      let famOpts = '', preOpts = '';
+      EFFECTS.families.forEach((name, fi) => {
+        if (/^Interattivo|^Modello 3D/.test(name)) return;
+        famOpts += '<option value="' + fi + '"' + (fi === cur.family ? ' selected' : '') + '>' + name + '</option>';
+      });
+      EFFECTS.list.forEach((e2, ei) => {
+        if (e2.family !== cur.family) return;
+        preOpts += '<option value="' + ei + '"' + (ei === z.src.effectIndex ? ' selected' : '') + '>' +
+          e2.name.replace(EFFECTS.families[e2.family] + ' · ', '') + '</option>';
+      });
+      mid = '<span class="mz-fx"><select class="mz-fam">' + famOpts + '</select>' +
+        '<select class="mz-pre">' + preOpts + '</select></span>';
+    }
     row.innerHTML =
-      '<span class="mz-ico">' + (isImg ? '🖼' : '🌀') + '</span>' +
+      '<span class="mz-ico">' + (isImg ? '🖼' : (isFx ? '✨' : '🌀')) + '</span>' +
       '<input class="mz-name" type="text" value="' + (z.name || 'Zona') + '" />' +
-      (isImg ? '<span class="mz-src" title="' + (z.src.path || '') + '">' +
-        String(z.src.path || '').split(/[\\/]/).pop() + '</span>'
+      (mid !== undefined ? mid
         : '<span class="mz-rect">Porzione ' +
           '<input class="mz-r" data-k="0" type="number" min="0" max="100" value="' + Math.round(z.srcRect[0]*100) + '" />%,' +
           '<input class="mz-r" data-k="1" type="number" min="0" max="100" value="' + Math.round(z.srcRect[1]*100) + '" />% ' +
@@ -1455,6 +1474,27 @@ function renderMapZones() {
     row.querySelector('.mz-name').addEventListener('change', (e) => {
       z.name = e.target.value; mapSave(); mapSendZones();
     });
+    const famSel = row.querySelector('.mz-fam');
+    if (famSel) {
+      const preSel = row.querySelector('.mz-pre');
+      famSel.addEventListener('change', () => {
+        const fam = parseInt(famSel.value, 10);
+        preSel.innerHTML = '';
+        EFFECTS.list.forEach((e2, ei) => {
+          if (e2.family !== fam) return;
+          const o = document.createElement('option');
+          o.value = ei;
+          o.textContent = e2.name.replace(EFFECTS.families[fam] + ' · ', '');
+          preSel.appendChild(o);
+        });
+        z.src.effectIndex = parseInt(preSel.value, 10);
+        mapSave(); mapSendZones();
+      });
+      preSel.addEventListener('change', () => {
+        z.src.effectIndex = parseInt(preSel.value, 10);
+        mapSave(); mapSendZones();
+      });
+    }
     row.querySelectorAll('.mz-r').forEach(inp => inp.addEventListener('change', (e) => {
       const k = parseInt(e.target.dataset.k, 10);
       z.srcRect[k] = Math.max(0, Math.min(1, (parseInt(e.target.value, 10) || 0)/100));
@@ -1477,6 +1517,8 @@ $('#map-on').addEventListener('change', (e) => {
 });
 $('#map-edit').addEventListener('change', (e) => send({ type: 'mapEdit', on: e.target.checked }));
 $('#map-add-vis').addEventListener('click', () => mapAddZone({ type: 'visual' }));
+$('#map-add-fx').addEventListener('click', () =>
+  mapAddZone({ type: 'effect', effectIndex: EFFECTS.list.indexOf(EFFECTS.defaults()) < 0 ? 12 : EFFECTS.list.indexOf(EFFECTS.defaults()) }));
 $('#map-add-img').addEventListener('click', () => $('#map-img-input').click());
 $('#map-img-input').addEventListener('change', (e) => {
   const f = e.target.files[0];

src/mapping.js

@@ -104,6 +104,7 @@ class MappingSim {
     this.visTex = mkTex();
     this._mkTex = mkTex;
     this.imgTex = {};        // path -> {tex, ok}
+    this.fx = {};            // zoneId -> {canvas, viz, tex, effectIndex} own engine
     this.zones = [];
     this.editOn = false;
     this.selected = -1;
@@ -121,6 +122,33 @@ class MappingSim {
       opacity: z.opacity !== undefined ? z.opacity : 1
     }));
     if (this.selected >= this.zones.length) this.selected = this.zones.length - 1;
+    // per-zone effect engines: an independent Visualizer on an offscreen
+    // canvas, so every zone can run a DIFFERENT preset in sync with the music
+    for (const id in this.fx) {
+      if (!this.zones.some(z => z.src.type === 'effect' && String(z.id) === id)) {
+        try { this.fx[id].viz = null; } catch (e) {}
+        delete this.fx[id];
+      }
+    }
+    for (const z of this.zones) {
+      if (z.src.type !== 'effect' || !window.Visualizer || !window.EFFECTS) continue;
+      let f = this.fx[z.id];
+      if (!f) {
+        const cv = document.createElement('canvas');
+        cv.width = 960; cv.height = 540;
+        const viz = new window.Visualizer(cv);
+        viz.resize = () => {};             // fixed offscreen resolution
+        cv.width = 960; cv.height = 540;
+        viz.gl.viewport(0, 0, 960, 540);
+        f = this.fx[z.id] = { canvas: cv, viz, tex: this._mkTex(), effectIndex: -1 };
+      }
+      if (f.effectIndex !== z.src.effectIndex) {
+        let e = window.EFFECTS.list[z.src.effectIndex];
+        if (!e || e.isInteractive || e.isModel3d) e = window.EFFECTS.defaults();
+        f.viz.setEffect(e);
+        f.effectIndex = z.src.effectIndex;
+      }
+    }
     // preload image textures
     const gl = this.gl;
     for (const z of this.zones) {
@@ -193,10 +221,20 @@ class MappingSim {
     return hit;
   }
 
-  render() {
+  render(timeSec, audio) {
     const gl = this.gl, cv = this.canvas;
     const w = this.main.width, h = this.main.height;
     if (cv.width !== w || cv.height !== h) { cv.width = w; cv.height = h; }
+
+    // step the per-zone effect engines and refresh their textures
+    for (const z of this.zones) {
+      const f = z.src.type === 'effect' && this.fx[z.id];
+      if (!f) continue;
+      try { f.viz.render(timeSec || 0, audio || {}); } catch (e) { continue; }
+      gl.bindTexture(gl.TEXTURE_2D, f.tex);
+      gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, f.canvas);
+    }
+
     gl.viewport(0, 0, w, h);
     gl.clearColor(0, 0, 0, 1);
     gl.clear(gl.COLOR_BUFFER_BIT);
@@ -219,6 +257,10 @@ class MappingSim {
         const e = this.imgTex[z.src.url];
         if (!e || !e.ok) continue;
         tex = e.tex;
+      } else if (z.src.type === 'effect') {
+        const f = this.fx[z.id];
+        if (!f) continue;
+        tex = f.tex;
       }
       const c = z.corners;
       gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([

src/output.js

@@ -333,7 +333,9 @@ djv.onControl(async (m) => {
         ensureMapping().setZones((m.zones || []).map(z => Object.assign({}, z,
           { src: z.src && z.src.type === 'image'
             ? { type: 'image', url: toFileURL(z.src.path), path: z.src.path }
-            : { type: 'visual' } })));
+            : (z.src && z.src.type === 'effect'
+              ? { type: 'effect', effectIndex: z.src.effectIndex }
+              : { type: 'visual' }) })));
       } catch (e) { djv.report({ type: 'error', message: 'Mappatura: ' + e.message }); }
       break;
     case 'mapOn':
@@ -594,7 +596,7 @@ function frame() {
   const a = audio.values;
   avTick(performance.now());
   viz.render(t * speed, a);
-  if (mapOn && mapping) mapping.render();
+  if (mapOn && mapping) mapping.render(t * speed, a);
 
   // Interactive family: tell the control panel if the camera didn't start
   // (permission denied / missing device). Mouse interaction still works.
@@ -661,7 +663,9 @@ function ensureMapping() {
     // corner drags on the output flow back to the panel, which persists them
     mapping.onChange = (zones) => djv.report({ type: 'mapZones',
       zones: zones.map(z => ({ id: z.id, name: z.name,
-        src: z.src.type === 'image' ? { type: 'image', path: z.src.path } : { type: 'visual' },
+        src: z.src.type === 'image' ? { type: 'image', path: z.src.path }
+          : (z.src.type === 'effect' ? { type: 'effect', effectIndex: z.src.effectIndex }
+            : { type: 'visual' }),
         corners: z.corners, srcRect: z.srcRect, opacity: z.opacity })) });
   }
   return mapping;

src/style.css

@@ -931,6 +931,8 @@ kbd {
 .map-zone .mz-name { width: 90px; flex: 0 0 auto; }
 .map-zone .mz-src { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; opacity: 0.75; }
 .map-zone .mz-rect { flex: 1; display: flex; align-items: center; gap: 2px; white-space: nowrap; opacity: 0.9; }
+.map-zone .mz-fx { flex: 1; display: flex; gap: 4px; min-width: 0; }
+.map-zone .mz-fx select { flex: 1; min-width: 0; padding: 4px 6px; font-size: 11px; }
 .map-zone .mz-r { width: 44px; flex: 0 0 auto; }
 .map-zone .mz-op { flex: 0 0 70px; }
 .map-zone .mz-del {