This surface renders painfully slowly, is full of artifacts and doesn't
quite look right:

parametric
{
    function { sin(u * (  7 + cos( u/3 - 2*v) + 2 * cos( u/3 + v ) ) ) },
    function { cos(u * (  7 + cos( u/3 - 2*v) + 2 * cos( u/3 + v ) ) ) },
    function { sin( u/3 - 2*v ) + 2 * sin( u/3 + v) }
    <-pi, -pi>, <pi, pi>
    precompute 20 x, y, z
    accuracy 0.0001
    pigment { color red 1.0 }  finish { ambient 0.5 phong 0.8}
    //rotate y*45
}

I had read many times that parametrics where slow... very slow, I didn't
believe them until I tried one. I'm downloading the parametric inc mentioned
in one of the Isosurface tutorials.

From all appearances, I'm going to take a wild guess that POV3.6 has  the
same issues.

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