hi everybody and thank you for the help.
after a lot of trying i will do something with lux.
yikesmikes you are right that lux behalfs not as a real 3d layer and shine threw the pillars but i will make a precomp of the pillars and take it to mask out the lux layer.
i also tried the peter torpey tutorial but since my oriental windows are a lot bigger than the startbeam of the volume light i layed it behind the window in 3d space and it does not worked like i need it, because the lightbeam did not show through the window into the room (maybe my mistake, but i