How can I implement a yoyo animation in tween.js?

I'd be happy to help you with your tween.js implementation. To properly diagnose what's going wrong with your yoyo effect, I'll need to see your current code. However, I can provide you with a working example of how to implement a yoyo effect with tween.js.

Here's a basic implementation for a cube with a yoyo effect:

JAVASCRIPTCopied
// Import TWEEN
import TWEEN from '@tweenjs/tween.js';

// Assuming you have a cube object with position property
const cube = {
  position: { x: 0, y: 0, z: 0 }
};

// Create a tween for the cube
const tween = new TWEEN.Tween(cube.position)
  .to({ y: 5 }, 1000) // Move up 5 units over 1 second
  .easing(TWEEN.Easing.Quadratic.InOut)
  .yoyo(true) // Enable yoyo effect
  .repeat(Infinity) // Repeat indefinitely
  .start();

// Animation loop
function animate(time) {
  requestAnimationFrame(animate);
  
  // Update all tweens
  TWEEN.update(time);
  
  // Update your rendering here
  // For example: updateCubePosition(cube.position);
}

// Start the animation loop
requestAnimationFrame(animate);

Key points to check in your implementation:

1. Make sure you're calling TWEEN.update() in your animation loop
2. Ensure you've properly set up the .yoyo(true) and .repeat() methods
3. Verify that your tween is actually starting with .start()
4. Check that you're updating your scene/renderer after the tween updates

If you can share your current code, I can provide more specific guidance on what might be going wrong.