Think Larry's son  : )  means a spiral texture lacking in a center or
continuation beyond a certain radius.  Try a 'wood' 'texture_map' with
a clear (or otherwise plain) pigment as both beginning and end
indecies, the 'spiral1 2'texture at index 0.25 and 0.75, for example.
 Far as the object itself goes perhaps torus slices, rotated and
translated. Well you did ask  ; )

Bob

Chris Huff <Chr### [at] compuservecom> wrote in message
news:37D0430E.AA158CC2@compuserve.com...
> You could approximate a helix with triangles, but I don't think a
true
> helix is possible without the isosurface patch.
> And I think the spiral pattern will do what you want, it isn't
really a
> spiral but a kind of helix.
>

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