Wasn't it Quadhall who wrote:
>well, after seeing those interesting blobs and sphere sweeps, I decided to
>wrap a regular torus object with an isosurface (that looks remarkably like a
>blob object seen a few posts back).  I also used those cool photon
>thingies......

One of the built in isosurface functions does both the regular torus and
the twisty torus all in one go:-

isosurface {
  function {"func_12" <4, 9, 1, 0.02, 1, 0.6, 1, 0, 0, 0>}
        method 2
        max_gradient 4
        accuracy 0.0001
        contained_by{sphere 0,6}
        pigment {rgb .9}
        finish {phong 0.5 phong_size 10}
}

-- 
Mike Williams
Gentleman of Leisure

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