Animator.CrossFade

public function CrossFade(stateName: string, transitionDuration: float, layer: int = -1, normalizedTime: float = float.NegativeInfinity): void;

public void CrossFade(string stateName, float transitionDuration, int layer = -1, float normalizedTime = float.NegativeInfinity);

public function CrossFade(stateNameHash: int, transitionDuration: float, layer: int = -1, normalizedTime: float = float.NegativeInfinity): void;

public void CrossFade(int stateNameHash, float transitionDuration, int layer = -1, float normalizedTime = float.NegativeInfinity);

Parameters

stateName	The name of the destination state.
transitionDuration	The duration of the transition. Value is in source state normalized time.
normalizedTime	Start time of the current destination state. Value is in source state normalized time, should be between 0 and 1. If no explicit normalizedTime is specified or normalizedTime value is float.NegativeInfinity, the state will either be played from the start if it's not already playing, or will continue playing from its current time and no transition will happen.
layer	Layer index containing the destination state. If no layer is specified or layer is -1, the first state that is found with the given name or hash will be played.
stateNameHash	State hash of the destination state. Passing 0 will transition to self.

Create a dynamic transition between the current state and the destination state.

Both state as to be on the same layer.

You cannot change the current state on a synchronized layer, you need to change it on the referenced layer.