ModelAnimation

An ModelAnimation is a reusable set of keyframe tracks which represent an animation.

This class provides support for animating time positions on a targeted AnimatableModel

Here are some use cases for animations :

• On a very basic 3D model like a single infinite rotating sphere, you should not have to use this class but probably instead just call animate
• For a synchronised animation set like animating a cube and a sphere position and rotation at same time or sequentially, please consider using an android.animation.AnimatorSet playing a ofAnimation or ofPropertyValuesHolder
• If the mesh is a character, for example, there may be one ModelAnimation for a walkcycle, a second for a jump, a third for sidestepping and so on. Assuming a character object has a skeleton, one keyframe track could store the data for the position changes of the lower arm bone over time, a different track the data for the rotation changes of the same bone, a third the track position, rotation or scaling of another bone, and so on. It should be clear, that an ModelAnimation can act on lots of such tracks. Assuming the model has morph targets (for example one morph target showing a friendly face and another showing an angry face), each track holds the information as to how the influence of a certain morph target changes during the performance of the clip. In this case you should manage one android.animation.ObjectAnimator coming from ofAnimation per action. And an android.animation.AnimatorSet to play them sequentially or together.