Jitter Amoothing

public/js/detect-tuned.js

@@ -100,7 +100,12 @@ export class TunedDetector {
  * smoothing (kills jitter); moving fast => light smoothing (stays responsive).
  */
 class OneEuro {
-  constructor(minCutoff = 1.2, beta = 0.012, dCutoff = 1.0) {
+  // minCutoff: baseline smoothing when still (lower = smoother but laggier).
+  // beta: how aggressively smoothing backs off as the value moves (higher =
+  //   snappier tracking when you pan the phone, so ghosts follow the camera).
+  // Tuned for AR panning: keep jitter down when still, but track fast motion
+  // almost 1:1 so the world doesn't lag behind the camera.
+  constructor(minCutoff = 1.7, beta = 0.15, dCutoff = 1.0) {
     this.minCutoff = minCutoff; this.beta = beta; this.dCutoff = dCutoff;
     this.xPrev = null; this.dxPrev = 0; this.tPrev = null;
   }

public/js/exhibit.js

@@ -270,7 +270,7 @@ async function start() {
     return;
   }
   detector = new TunedDetector({ dictionaryName: 'ARUCO_4X4_1000' }).setPreset('forgiving');
-  tracker = new MarkerTracker({ coastMs: 300, smooth: true });
+  tracker = new MarkerTracker({ coastMs: 120, smooth: true }); // short coast: don't linger on stale pose while panning
 
   await new Promise((res) => { if (video.readyState >= 2) res(); else video.onloadeddata = () => res(); });
   sizeAll();
@@ -327,7 +327,7 @@ function loop(now) {
   // 3) animate ghosts: smooth toward server target, apply yaw + idle wobble
   const t = now / 1000;
   for (const obj of ghostObjs.values()) {
-    obj.group.position.lerp(obj.targetPos, 0.25); // smooth network updates
+    obj.group.position.lerp(obj.targetPos, 0.5); // smooth network updates (snappier follow)
     if (obj._yaw != null) {
       // face travel/authored yaw, eased
       const cur = obj.group.rotation.y;