check out this link

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2740087

more good tips in there about controlling riduclous tree counts

Quote - Hi checkthegate,

Thanks alot for your tips. They really are helping me out in trying to solve this HUGE problem.
I´m already waiting for the dem file of the portuguese river - starts in Spain and ends in the Atlantic Ocean on the portuguese coast - so i´ll keep you informed about the development of the process.
I´m really waiting to start this work, feeling that VUE XSTREAM is the best software to make it with superior quality.

Thanks,
P.S.- i´m from Portugal  and i appologize for some english mistakes.