Hello, I'm pretty new to shaders but I'm trying to create something like this effect: (minus the city lights): http://thewindowsclub.thewindowsclu...ent/uploads/2010/07/desktopearth_anim_two.gif Anyhow, so far I've managed to get some lights to go across the screen and over a map of earth, but that's about it, no idea how to make them like this shape :-/. My code: http://pastebin.com/GzB3a6Dq Some notes I'm using OpenGL as it needs to work on mobile devices and I'm only using a square vertex shader to cover the whole texture.