I'm having a think about how best to do plasma globes. I have a few ideas in the
pipeline, but here's a relatively simple way of getting most of the way there: a
density function in media.

This scene uses a macro that creates a plasma globe, which is called inside
loops to create the array of pillars and globes.

The pillars use a macro that scales the f_rounded_box isosurface function to
allow it to be used with any size of radius and box (not just the 0..1 range
allowed by the function by default). I might post that macro at a later date,
as it removes the unexpected behaviours of the standard function.

I'm currently working on a way of generating the glowing filaments (core to
shell), and will post some examples of this at a later date. In the meantime,
here's the media example...

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