Data for the play_properties argument of the Model.play_anim method.

@:optionaloptionalplayback_rate:Null<Float>

The rate with which the animation will be played. Must be positive.

@:optionaloptionaloffset:Null<Float>

The normalized initial value of the animation cursor when the animation starts playing.

@:optionaloptionalblend_duration:Null<Float>

Duration of a linear blend between the current and new animation.