Hi, I'm playing around with surface movement on a river and would like the waves  to continuously loop.  My plan was to make each wave 3x the width of the viewport and then reset its x location to get a loop effect but then I realized that I don't know how to crop a graphic to the viewport. I'm pretty new to this and was wondering if someone could give me any advice or point me to a tutorial or suggest a better method?      Thanks in advance -Kevin See t