> Top tip: Take out the max() function and watch the render drop from 350 
> pixels/second to 50 pixels/second. :-)

Uh... yeah... forgot to mention. The *reason* is that without max(), you 
have to set max_gradient exp(17) to get a picture. :-| But with max() in 
there, you can set it very much lower and it renders correctly.


Change #declare Iterations = 2; to something else to make the surface 
more complicated. (And slower to render!) You may need to increase the 
max_gradient a notch also; let it render and see if it's OK.

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