You are great. If i understood correctly:
I place an actor in that actors center and in it i can make a trace to find the edges. These points i have to set as Spots for the EQS. I think this will work.
Many thanks Nawrot 
You are great. If i understood correctly:
I place an actor in that actors center and in it i can make a trace to find the edges. These points i have to set as Spots for the EQS. I think this will work.
Many thanks Nawrot