Any help with your caustics procedure in my image will be welcome. I am working on the file that I submitted in the tg2 discussion section on Aug. 8th, and will shortly put up the reworked version with greater terrain and water detail. The water transparency has improved to the point that I can now consider attempting your caustic effect. I will probably import your fake stone clip into this image instead of the rocks that are presently being used, and then will begin to reverse engineer your clips and tgd to get my head around this using the data you have provided us on this thread. Thanks will get back with you on this.