Help with playing animation backwards

[Chaeril M]

  // Check if the animationName has a previous timescale value; default to 1 if not
  const timeScale = animationTimeScales[animationName] || 1.0
  const clampWhenFinished = (timeScale === 1.0)
  const startAt = (timeScale === 1) ? 0 : 1000  // crossFadeDuration * 1000ms

  console.log(timeScale)

  model.removeAttribute('animation-mixer')
  model.setAttribute('animation-mixer', {
    clip: animationName,
    loop: 'once',
    crossFadeDuration: 1,
    timeScale,
    clampWhenFinished,
    startAt,
  })

  // Store the new timescale for this animationName
  animationTimeScales[animationName] = timeScale * -1.0

i had code like above, animation in blender was 60 frames. using crossFadeDuration:1 i'll get a 60fps animation. after that i set timeScale to -1 so it will play backwards. It does play backwards, but it was played in instant. how to get the same speed as when i'm playing it forward.

[Vincent Fretin]

The crossFadeDuration is for the duration to cross fade between animations. Does your animation is 1s? Probably not, so the startAt is probably wrong here, and this option is mainly useful when you don't have named animations if I remember.
I did a quick experiment with https://c-frame.github.io/aframe-extras/examples/animation-controls/ setting time scale at -1 and the Death animation for example with loop once, and switching between animation, but yeah it doesn't work, and startAt is no useful here because we have named animations.
The loop ping pong works correctly.
I'm not sure how to reverse an animation here, I don't have the answer right now.

[Micah Blumberg]

Here is an example that works, and an explanation for why it works. GLBanireverse