ego viewer: hand-pose 3D no longer blank when paused at t=0 (snap past leading all-zero pose frames)

egoSample/mego.html

@@ -166,8 +166,11 @@ function loadSig(slug){
   const prev=document.getElementById('sigjs'); if(prev) prev.remove();
   window.EPDATA=window.EPDATA||{};
   const done=()=>{ SIG=window.EPDATA[slug]; if(!SIG) return; sizeCanvases(); drawCharts();
-    let fv=0; for(let k=0;k<SIG.n;k++){ if(SIG.handL.valid[k]>0.5&&SIG.handR.valid[k]>0.5){ fv=k/SIG.fps; break; } }
-    if(master && master.currentTime<0.05 && fv>0) setTime(fv); else if(master){ updateUI(master.currentTime||0); blitMain(); }
+    // park on the first frame that actually has hand data (the raw pose arrays have
+    // ~2 leading all-zero frames) so the 3D panel isn't blank while the clip is paused
+    let fk=0; while(fk<SIG.n && !(handOk(SIG.handL.pos[fk])||handOk(SIG.handR.pos[fk]))) fk++;
+    const fv = fk<SIG.n ? (fk+0.5)/SIG.fps : 0;
+    if(master && fv>0 && master.currentTime<fv-0.01) setTime(fv); else if(master){ updateUI(master.currentTime||0); blitMain(); }
     // start playback only once the master tile can actually play, so the per-frame
     // slave sync chases a real timestamp instead of hammering seeks against t=0
     const go=()=>{ if(_toggle && !playing) _toggle(); };
@@ -658,9 +661,20 @@ function smoothKp(pos,x,W,k){
     acc[0]+=p[0]*wt; acc[1]+=p[1]*wt; acc[2]+=p[2]*wt; sw+=wt; }
   return sw>0 ? [acc[0]/sw,acc[1]/sw,acc[2]/sw] : med;
 }
-function handAt(side,t){ const [j0,j1,a]=sfrac(t); const H=SIG['hand'+side];
-  if(!(handOk(H.pos[j0])||handOk(H.pos[j1]))) return null;
-  const x=Math.max(0,Math.min(SIG.n-1.0001, t*SIG.fps)), W=CAL.smoothW||0;
+function handAt(side,t){ const H=SIG['hand'+side], N=SIG.n;
+  let x=Math.max(0,Math.min(N-1.0001, t*SIG.fps));
+  // MEgo hand pose carries a few all-zero frames at the very start/end of each
+  // episode. If the viewer is parked exactly there (e.g. paused at t=0 because the
+  // browser blocked video autoplay), snap to the nearest populated frame so the
+  // panel shows the first/last real pose instead of going blank.
+  const ok=j=>handOk(H.pos[j]);
+  if(!ok(Math.floor(x)) && !ok(Math.ceil(x))){
+    let hi=Math.ceil(x); while(hi<N && !ok(hi)) hi++;
+    let lo=Math.floor(x); while(lo>=0 && !ok(lo)) lo--;
+    if(hi>=N && lo<0) return null;
+    x = (hi<N && (lo<0 || hi-x<=x-lo)) ? hi : lo;
+  }
+  const j0=Math.floor(x), j1=Math.min(N-1,j0+1), a=x-j0, W=CAL.smoothW||0;
   let pts;
   if(W>0){ pts=[]; for(let k=0;k<21;k++){ const p=smoothKp(H.pos,x,W,k); if(!p){ pts=null; break; } pts.push(p); } }
   if(!pts){ const A=H.pos[j0],B=H.pos[j1]; pts=(handOk(A)&&handOk(B))?A.map((p,i)=>lerpV(p,B[i],a)):(handOk(A)?A:B); }