sorry for my english.
my concern was that the blob of letters coming from processing [my particle system] was not being displayed at the location where the book hit the wall but in the center all the time.
a friend realized my threshold was out of range and i fixed it.
now my next problem is related to processing: at the 4th book thrown the letters become slow, very slow [heavy]
and i need to write in my script something so that once an array of letters is released, stop it and only make the next blob when need it. or something.