This version of Unity is unsupported.

WrapMode.PingPong

Description

When time reaches the end of the animation clip, time will ping pong back between beginning and end.

It has same behaviour when playing backwards - when time reaches the beginning of the animation clip, time will ping pong back between beginning and end. The animation will never automatically stop playing.

Additional resources: AnimationState.wrapMode, AnimationState.time, AnimationState.speed properties.