Am 30.09.2017 um 05:16 schrieb Bald Eagle:

> If you take a look over at
> http://www.econym.demon.co.uk/isotut/builtin1.htm
> at
> http://www.econym.demon.co.uk/isotut/std007.jpg
> you'll see that Mike Williams' render of this function shows the same odd sphere
> at the center.

Judging from those images, my guess would be that the sphere constitutes
an intentional hack, to prevent the gradient from exploding at the
coordinate origin.

However, I would also guess that the hack was designed with a circular
cross-section in mind, and that it might be worth changing the code so
that it adapts to the cross-section of the spiral.

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