| animator | The Animator evaluating this state machine. |
| animatorStateInfo | Information about the entered state. |
| layerIndex | The current layer being evaluated. |
Invoked on the first update frame when a state machine evaluates this state. Implement this message to react to a new state starting.
OnStateEnter is invoked when a transition to a state is initiated. It will be invoked after OnStateUpdate of the current state.
Note: OnStateEnter may be invoked multiple times on the same state if that state is synchronized on multiple layers.