message: Updated README to discuss get_py_proxy
diff: @@ -946,6 +946,41 @@ on top of UnrealEnginePythonPrivatePCH.h and rebuild the plugin.
  As with native threads, do not modify (included deletion) UObjects from non-main threads.
  +Accessing Python Proxy From UObject
  +-----------------------------------
  +
  +Sometimes you may have a UObject and know that it is backed by a python object. To get the python object from the UObject, use the `get_py_proxy` method. For example, imagine you have the following situation:
  +
  + 1. There is a `PyActor` sub-class called `PyExplosiveActor` which has `Explosive` as its python class.
  + 2. The `Explosive` has a `go_boom` python method.
  + 3. There is a `PyActor` sub-class called `PyBadGuyActor` which has a Blueprint property called `MyBomb` and a python class called `BadGuy`.
  + 4. The `BadGuy` instance in python knows that its UObject has its `MyBomb` as an instance of `PyExplosiveActor` and wants to call the `go_boom` python method.
  +
  +This would be resolved as shown below:
  +
  +```
  +import unreal_engine as ue
  +
  +class Explosive:
  + 'Python representation for PyExplosiveActor in UE4'
  +
  + def go_boom(self):
  + # do python stuff to explode
  + ...
  + self.uobject.destory()
  +
  +class BadGuy:
  + 'Python reprsentation for PyBadGuyActor in UE4'
  +
  + def ignite_bomb(self, delay):
  + bomb = self.uobject.MyBomb
  + py_bomb = bomb.get_py_proxy()
  + py_bomb.go_boom()
  +
  +```
  +
  +What is going on here in `BadGuy` is that self.uobject is a reference to the PyActor UObject and `self.uobject.MyBomb` is a reference to the `PyExplosive` uobject. But instead you want to access its proxy class (`Explosive`). The `get_py_proxy()` method returns the python custom class, `Explosive` that the `PyExplosiveActor` object is mapped to.
  +
  Status and Known issues
  -----------------------
  