An FFGL effect that turns a clip into ink: continuous, closed strokes on paper instead of a glowing outline. Most edge effects ask how fast the tone's changing at each pixel, which gives you a magnitude with no idea of direction. nib works out which way the drawing runs first, then steers a difference of Gaussians across the flow and a line integral convolution along it, so a pixel whose neighbours agree with it survives and one that fired on its own doesn't.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.