title: Sphere rotation in Babylon.js
body: <p>I want to ask for help regarding rotation using the Babylon.js framework.</p>
  
  <p>I need the sphere to rotate 45 degrees, exactly aligned with the diagonal circle, which has a 45 degree orientation, but I'm not getting it.</p>
  
  <p>The code I made is in the link below:
  <a href="https://codepen.io/polalas/pen/VwvaKwL" rel="nofollow noreferrer">https://codepen.io/polalas/pen/VwvaKwL</a></p>
  
  <p>The method responsible for the rotation is the loop () method, which is triggered every time the scene is rendered.</p>
  
  <pre><code>function loop () {
      var y1 = scene.getMeshByName("I1");
      y1.rotation.y - = 0.01 * Math.sin (Math.PI / 4);
      y1.rotation.x - = 0.01 * Math.sin (Math.PI / 4);
  }
  </code></pre>
  
  <p>I imagine that I mishandled the rotation. Could someone help, please?</p>