This model demonstrates a two-channel animation, one for rotation and the other translation. A smaller box rises up out of a larger hollow one, flips over, and sinks back down.
This model features a single animation with a pair of channels that have different lengths. The "rotation" channel finishes its work before the "translation" channel is done. However, these channels are not permitted to get out of sync: The shorter channel may not loop and begin repeating until all of the channels within that animation have finished playing. Client runtimes must ensure that a single input time is given to all of the channels within a particular animation, for the animation to remain sensible.
This model will reveal such an issue on subsequent bounces of the inner purple box. In affected runtimes, the box will begin rotating before it has moved to the top position, and collide with the blue box. If you see this, please file an issue on the affected runtime's issue tracker.
Donated by Cesium for glTF testing.
This model is licensed under a Creative Commons Attribution 4.0 International License.