The PlayerChangedDimension Event is fired whenever a player's dimension/world changes, for example upon entering/leaving the nether.

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerChangedDimensionEvent
You can, of course, also import the class before and use that name then.

PlayerChandedDimension Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IPlayerEvent

The following information can be retrieved from the event:

ZenGetter	Return Type
ZenGetter player	Return Type IPlayer
ZenGetter from	Return Type int
ZenGetter fromWorld	Return Type IWorld
ZenGetter to	Return Type int
ZenGetter toWorld	Return Type IWorld