>>Also of interest: slice the isosurface and stick a matching 2D plot on
>>the cross-section! (I will do this later if I figure out pigment
>>functions...)
> 
> 
> Here are cross sections through the three axes. I used 12 iterations here
> (pigment functions are a lot faster than 3d isosurfaces).

Neat!

The bottom image looks like one would expect. The other two look like I 
maybe messed up my maths somewhere... they don't look right somehow.

The bottom image I'm guessing is A=(0, 0), B=(x, y). That looks correct. 
If you try A=(x, y), B=(0, 0) it should look like this:

http://www.felicite-parmentier.freeserve.co.uk/large/cubic-mand.gif

However, it looks like the second image is trying to be that, but messed 
up. Looks like I need to go recheck my math! (You'll notice that the 
image that looks right doesn't use A at all - and there's an 
optimisation involved with the A variable. Wanna bet I optimised it wrong?)

Anyways, usually when rendered 2D, the part of the isosurface that's 
solid is coloured black, and the parts outside are multicoloured. ;-) Of 
course, there's no *law* about that...

I'll go see if I can figure out if/where my code is wrong. :-S

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