Yeah It would be really neat if you could just make a cube, offset x in material lab by a certain number of bryce units and have it repeat.(Render times will indeed be long.) In material lab editor, try using "object top" instead of "object space" and 90 bryce units +- 10 offset(just below rotate)). That seems to come close - I used "leo" for my experiment instead of a texture. Let us know what you come up with. Anyway the two methods you learned for rotation won't go to waste - except for the boolean part you can now create animated waterfalls. Either method of rotation will work for waterfalls.(and I am sure you will come up with other uses for the knowledge.)