Plasma ball

Run demo

More noisy balls. Time to be nostalgic with a classic from the 80′s: The plasma lamp. I have never had the opportunity to own one myself, maybe that’s why I’m so fascinated by them. There is even small USB driven ones nowadays. I’ve had this idea for a demo a long time and finally made a rather simple one.

The electric lightning  is made up by tubes that is displaced and animated in the vertex shader, just as in my last experiment.  I reuse the procedurally generated noise-texture that is applied to the emitting sphere. I displace local x- and z-position with an offset multiplied by the value I get from the noise-texture on the corresponding uv-position (along y-axis). To make the lightning progress more naturally I also use a easing-function on this factor. Notice that it’s less displacement near the center and more at the edges.

I’m have this idea of controlling the lightning with a multi-touch websocket-connection between a mobile browser and the browser just to learn node.js and sockets. Let’s wait and see how this evolves. Running this on on a touch-screen directly would have been even nicer of course. If someone can do that, I will add multiple touch-points, just let me know.

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