Thnigs i will cover:
1) How to get objects created on the editor from Cpp
2) How to send objects created by Cpp code to LUA
3) How to call an entity's script LUA function easely (without parameters)
4) How to call an entity's script LUA function passing parameters
5) How to receive returned parameters from LUA functions (yes one or more)
6) How to expose a Cpp Class to LUA using tolua++
I will split this post acordingly to the items listed