This is an old demo I’ve radically updated. Way back when I built an image distortion demo in Macromedia Director lingo (ran about 0.1fps) . This version is built in a GLSL vertex shader (runs 90fps).
If you have an OpenGL 2.0 capable Mac:
Try opening a 640×480-ish sized image.
The distortion is a Fractional Linear Transform across the hyperbolic plane (poincare unit disk). If anyone is interested I can dig up the math. This type of distortion is the same kind found in Inxight’s Startree. Except, instead of just transforming a small set of points, we transform the entire image here (functionally anyways).
Screenshots:
