> Does the isosurface implementation work by:
>
> a)  Subdividing a ray, testing for inside / outside, until a good
> approximation of the border is found,
>
> b) Symbolically solving the function for the intersection with the ray?

I suspect A, and I think that the procedure is repeated until the distance
between two sampled points is less than or equal to the value specified for
accuracy.

I know it's not B, because that would be analytically impossible in many,
many situations, especially those involving pigments and POV-Ray generated
patterns.

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]

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