In this video you can watch me rather hamfistedly describe how to use Functy to render a "wavy tartan see-through surface". If I'd practiced it a bit beforehand I might have managed to think up a catchier name for it than that. In spite of the disastrous audio, it does nonetheless show how to use functions for the surface, colour components and alpha value, and how to animate using time.

More info about Functy can be found at functy.sourceforge.net

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