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<!DOCTYPE html>

<html class="reftest-wait">

<head>

<title>HRTF NaN Elevation</title>

</head>

<script>

async function triggerBug() {

  const cfg = {

    fx:0.043517067754535048, fy:0.794644976443179, fz:-0.6055126969995484,

    ux:0.9912413881446818,   uy:0.0412998549923505, uz:0.1254385602859641,

};

  // Create offline audio context with HRTF-native sample rate

  let ctx = new OfflineAudioContext(2, 128, 44100);

  // Set listener orientation to values producing |up| > 1.0

  ctx.listener.setOrientation(

    cfg.fx, cfg.fy, cfg.fz,   // front direction

    cfg.ux, cfg.uy, cfg.uz    // up direction

);

  ctx.listener.setPosition(0, 0, 0);

  // Create audio source

  let osc = ctx.createOscillator();

  osc.frequency.value = 440;

  // Create HRTF panner

  let panner = ctx.createPanner();

  panner.panningModel = 'HRTF';

  // Position source along the computed 'up' direction

  // This maximizes upProjection, causing acos to return NaN

  panner.setPosition(cfg.ux, cfg.uy, cfg.uz);

  osc.connect(panner);

  panner.connect(ctx.destination);

  osc.start(0);

  await ctx.startRendering();

  document.documentElement.removeAttribute("class");

triggerBug();

</script>

</html>