> Crackle pigments are not suitable for use in isosurfaces.

Why is this? Just the fact that it has non-differentiable points in the
function? In my experience setting a very high max_gradient usually
minimizes that problem; is there another reason for it?

> Artefacts appear on the surface of a distant torus.
> It's a limitation of the floating point accuracy of your computer. The
> torus primitive uses a fourth order equation, so it fails first.

Ah, thanks for the explanation about it being a fourth-order equation.

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

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