Wasn't it David Robinson who wrote:
>
>Only real problem right now is that it only renders 1/4 of the scene (but I
>have a feeling it is more likely to be building 1/4 of the model). I've
>tried playing with a couple of settings but nothing is making enough of a
>difference to hit me in the face with a clue...!

That's because your "contained_by" box has a corner at the origin, but
the helical torus is centred at the origin. So all the bits on the
negative sides are outside the container.

Try 

 contained_by { box { -8,8 } }
 max_gradient 3


-- 
Mike Williams
Gentleman of Leisure

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