[animation-mixer] Animation cannot be set and unpaused in the same change

[EPurwanto]

I have an animation that I need to start paused on the first frame with animation-mixer="timescale: 0;"

After some events, I want to set the animation clip to play and unpause it, by calling el.setAttribute("animation-mixer", {clip: "some_clip", timeScale: 1}), however there is a data.timeScale !== 1 check in the playAction function that ignores the change to timeScale.

I'm not sure if it would be better to change that check to data.timeScale !== action.effectiveTimeScale, remove it entirely, or change the update function to apply timescale changes there.

For now, I'm working around the issue by setting the clip in the starting settings as animation-mixer="clip: some_clip; timescale: 0;, but that only works because I know what clip I want to play.

[n5ro]

hmm... can you share a simplified bare minimum example, and we can try to test out your different ideas? I am also open to a voice call and a screen share to work on this. I think you can dm me (is that possible on github? not sure. If not you can also join this discord http://thexrweb.com and present the same issue there and we can continue trying to work on it from there.) we could try.

[EPurwanto]

I've set up an example that demonstrates what I mean. https://codesandbox.io/s/adoring-chatelet-f3cgl

the following keys are used
z,x,c: Set the timescale to 0, 0.5 or 1
1-4: Set the clip to "Linear *", "Step *", "CubicSpline *" or just "*"
alt + 1-4: Set the clip and timescale = 0
ctrl + 1-4: Set the clip and timescale = 0.5
shift + 1-4: Set the clip and timescale = 1

From playing around with it, it seems the situation is a little different than I originally thought. It seems like individual animations are remembering the last timescale assigned to them. Here are some examples I noticed misbehaving, with the key presses required.

Example 1:

1. [4] Play all the animations
2. [z] Set timescale to 0
3. [1] Play the Linear Animations
4. [c] Set timescale to 1. Animation 1 will play correctly
5. [2] Play the Step Animations. These will not be playing, despite timescale being set to 1.
6. [3] Play the CubicSpline Animations. These will not be playing, despite timescale being set to 1.

Example 2

1. [1] Play the Linear Animations
2. [z] Set timescale to 0
3. [shift + 1] Play the Linear Animations and set timescale to 1. This will play correctly.
4. [z] Set timescale to 0
5. [2] Play the Step Animations
6. [shift + 1] Play the Linear Animations and set timescale to 1. This will not play.

Both issues also occur if you use 0.5 and 1 for the timeScales, instead of 0 and 1. (key presses [4, x, 1, c, 2, 3] and [1, x, shift + 1, x, 2, shift + 1])

However they work as expected if you use 0 and 0.5 (key presses [4, z, 1, x, 2, 3] and [1, z, ctrl + 1, z, 2, ctrl + 1]).

Once you have broken the animation, you cannot restore it by setting timescale = 1 via [c] or [shift + 1-4]. You have to set timescale = 0 or 0.5 first, and then you can set it back to 1.