/* ---------- warm-up: compile every material and upload buffers before the first frame is shown ---------- */
function warmup() {
  renderer.compile(scene, camera);
  [0.5, STEP.saturn.tB, STEP.hd189733b.tH, STEP.hd189733b.tB, STEP.sun.tH, STEP.betelgeuse.tS, STEP.vycma.tB, s60a, soA, s10A, slbA, smwA, sm31A, svA, sqA, souA, T_HOME_MID - 1.5, T_HOME_MID + 0.8, startT].forEach(tau => renderAt(WARP.toT(tau)));
}
Promise.all([TEX_READY, SKY_READY]).then(() => {
  try {
    warmup();
    window.__started = true;
    // the one fade from black, on first start only (the loop itself never goes to black)
    if (params.has('freeze')) BLACK.style.opacity = '0';
    else requestAnimationFrame(() => { BLACK.style.transition = 'opacity 1.6s ease'; BLACK.style.opacity = '0'; });
    clearTimeout(window.__bootTimer);
    base0 = performance.now();
    requestAnimationFrame(frame);
  } catch (e) {
    console.error(e);
    window.__showError('Rendering failed to start: ' + (e && e.message ? e.message : e));
  }
}).catch(e => { console.error(e); window.__showError('Textures failed to load: ' + (e && e.message ? e.message : e)); });
</script>
</body>
</html>